D.3 Changes in release 4.0.x (Production)

Version 4.0 of the MySQL server includes many enhancements and new features:

• The InnoDB table type is now included in the standard binaries, adding transactions, row-level locking, and foreign keys. See section InnoDB Tables.
• A query cache, offering vastly increased performance for many applications. By caching complete result sets, later identical queries can return instantly. See section MySQL Query Cache.
• Improved full-text indexing with boolean mode, truncation, and phrase searching. See section MySQL Full-text Search.
• Enhanced MERGE tables, now supporting INSERT statements and AUTO_INCREMENT. See section MERGE Tables.
• UNION syntax in SELECT. See section UNION Syntax.
• Multi-table DELETE statements. See section DELETE Syntax.
• libmysqld, the embedded server library. See section libmysqld, the Embedded MySQL Server Library.
• Additional GRANT privilege options for even tighter control and security. See section GRANT and REVOKE Syntax.
• Management of user resources in the GRANT system, particularly useful for ISPs and other hosting providers. See section Limiting user resources.
• Dynamic server variables, allowing configuration changes without having to take down the server. See section SET Syntax.
• Improved replication code and features. See section Replication in MySQL.
• Numerous new functions and options.
• Changes to existing code for enhanced performance and reliability.

For a full list of changes, please refer to the changelog sections for each individual 4.0.x release.

D.3.1 Changes in release 4.0.16 (not released yet)

Functionality added or changed:

• Updated mysql_install_db to be able to use the local machine's IP address instead of the host name when building the initial grant tables if skip-name-resolve has been specified in my.cnf. Using this optione can be helpful on FreeBSD to avoid thread-safety problems with the FreeBSD resolver libraries. (Thanks to Jeremy Zawodny for the patch)

Bugs fixed:

D.3.2 Changes in release 4.0.15 (03 Sep 2003)

Functionality added or changed:

• mysqldump now correctly quotes all identifiers when communicating with the server. This assures that during the dump process, mysqldump will never send queries to the server that result in a syntax error. This problem is not related to the mysqldump program's output, which was not changed. (Bug #1148)
• Change result set metadata information so that MIN() and MAX() report that they can return NULL (this is true because an empty set will return NULL). (Bug #324)
• Produce an error message on Windows if a second mysqld server is started on the same TCP/IP port as an already running mysqld server.
• The mysqld server variables wait_timeout, net_read_timeout and net_write_timeout now work on Windows.
• Added option --sql-mode=NO_DIR_IN_CREATE to make it possible for slaves to ignore INDEX DIRECTORY and DATA DIRECTORY options given to CREATE TABLE. When this is mode is on, SHOW CREATE TABLE will not show the given directories.
• SHOW CREATE TABLE now shows the INDEX DIRECTORY and DATA DIRECTORY options, if they were specified when the table was created.
• The open_files_limit server variable now shows the real open files limit.
• MATCH ... AGAINST() in natural language mode now treats words that are present in more than 2,000,000 rows as stopwords.
• The Mac OS X installation disk images now include an additional `MySQLStartupItem.pkg' package that enables the automatic startup of MySQL on system bootup. See section Installing MySQL on Mac OS X.
• Most of the documentation included in the binary tarball distributions (.tar.gz) has been moved into a subdirectory docs. See section Installation Layouts.
• The manual is now included as an additional info file in the binary distributions. (Bug #1019)
• Many binary distributions now include the embedded server library (libmysqld) by default. See section Embedded MySQL Server.
• MySQL can now use range optimisation for BETWEEN with non-constant limits. (Bug #991)
• Replication error messages now include the default database, so that users can check which database the failing query was run for.
• A documentation change: Added a paragraph about how the binlog-do-db and binlog-ignore-db options are tested against the database on the master (see section The Binary Log), and a paragraph about how replicate-do-db, replicate-do-table and analogous options are tested against the database and tables on the slave (see section Replication Options in `my.cnf').
• Now the slave does not replicate SET PASSWORD if it is configured to exclude the mysql database from replication (using for example replicate-wild-ignore-table=mysql.%). This was already the case for GRANT and REVOKE since version 4.0.13 (though there was Bug #980 in 4.0.13 & 4.0.14, which has been fixed in 4.0.15).
• Rewrote the information shown in the State column of SHOW PROCESSLIST for replication threads and for MASTER_POS_WAIT() and added the most common states for these threads to the documentation, see section Replication Implementation Details.
• Added a test in replication to detect the case where the master died in the middle of writing a transaction to the binlog; such unfinished transactions now trigger an error message on the slave.
• A GRANT command that creates an anonymous user (that is, an account with an empty username) no longer requires FLUSH PRIVILEGES for the account to be recognized by the server. (Bug #473)
• CHANGE MASTER now flushes `relay-log.info'. Previously this was deferred to the next run of START SLAVE, so if mysqld was shutdown on the slave after CHANGE MASTER without having run START SLAVE, the relay log's name and position were lost. At restart they were reloaded from `relay-log.info', thus reverting to their old (incorrect) values from before CHANGE MASTER and leading to error messages (as the old relay log did not exist any more) and the slave threads refusing to start. (Bug #858)

Bugs fixed:

• Fixed buffer overflow in SET PASSWORD which could potentially be exploited by MySQL users with root privileges to execute random code or to gain shell access (thanks to Jedi/Sector One for spotting and reporting this one).
• Fixed server crash on FORCE INDEX in a query that contained "Range checked for each record" in the EXPLAIN output. (Bug #1172)
• Fixed table/column grant handling - proper sort order (from most specific to less specific, see section Access Control, Stage 2: Request Verification) was not honored. (Bug #928)
• Fixed rare bug in MYISAM introduced in 4.0.3 where the index file header was not updated directly after an UPDATE of split dynamic rows. The symptom was that the table had a corrupted delete-link if mysqld was shut down or the table was checked directly after the update.
• Fixed Can't unlock file error when running myisamchk --sort-index on Windows. (Bug #1119)
• Fixed possible deadlock when changing key_buffer_size while the key cache was actively used. (Bug #1088)
• Fixed overflow bug in MyISAM and ISAM when a row is updated in a table with a large number of columns and at least one BLOB/TEXT column.
• Fixed incorrect result when doing UNION and LIMIT #,# when one didn't use braces around the SELECT parts.
• Fixed incorrect result when doing UNION and ORDER BY .. LIMIT # when one didn't use braces around the SELECT parts.
• Fixed problem with SELECT SQL_CALC_FOUND_ROWS ... UNION ALL ... LIMIT # where FOUND_ROWS() returned incorrect number of rows.
• Fixed unlikely stack bug when having a BIG expression of type 1+1-1+1-1... in certain combinations. (Bug #871)
• Fixed the bug that sometimes prevented a table with a FULLTEXT index from being marked as "analyzed".
• Fixed MySQL so that the field length (in C API) for the second column in SHOW CREATE TABLE is always larger than the data length. The only known application that was affected by the old behaviour was Borland dbExpress, which truncated the output from the command. (Bug #1064)
• Fixed crash in comparisons of strings using the tis620 character set. (Bug #1116)
• Fixed ISAM bug in MAX() optimisation.
• myisamchk --sort-records=N no longer marks table as crashed if sorting failed because of an inappropriate key. (Bug #892)
• Fixed a minor bug in MyISAM compressed table handling that sometimes made it impossible to repair compressed table in "Repair by sort" mode. "Repair with keycache" (myisamchk --safe-recover) worked, though. (Bug #1015)
• Fixed bug in propagating the version number to the manual included in the distribution files. (Bug #1020)
• Fixed key sorting problem (a PRIMARY key declared for a column that is not explicitly marked NOT NULL was sorted after a UNIQUE key for a NOT NULL column).
• Fixed the result of INTERVAL when applied to a DATE value. (Bug #792)
• Fixed compiling of the embedded server library in the RPM spec file. (Bug #959)
• Added some missing files to the RPM spec file and fixed some RPM building errors that occured on Red Hat Linux 9. (Bug #998)
• Fixed incorrect XOR evaluation in WHERE clause. (Bug #992)
• Fixed bug with processing in query cache merged tables constructed from more then 255 tables. (Bug #930)
• Fixed incorrect results from outer join query (e.g. LEFT JOIN) when ON condition is always false, and range search in used. (Bug #926)
• Fixed a bug causing incorrect results from MATCH ... AGAINST() in some joins. (Bug #942)
• MERGE tables do not ignore "Using index" (from EXPLAIN output) anymore.
• Fixed a bug that prevented an empty table from being marked as "analyzed". (Bug #937)
• Fixed myisamchk --sort-records crash when used on compressed table.
• Fixed slow (as compared to 3.23) ALTER TABLE and related commands such as CREATE INDEX. (Bug #712)
• Fixed segmentation fault resulting from LOAD DATA FROM MASTER when the master was running without the --log-bin option. (Bug #934)
• Fixed a security bug: A server compiled without SSL support still allowed connections by users that had the REQUIRE SSL option specified for their accounts.
• Fixed a random bug: Sometimes the slave would replicate GRANT or REVOKE queries even if it was configured to exclude the mysql database from replication (for example, using replicate-wild-ignore-table=mysql.%). (Bug #980)
• The Last_errno and Last_error fields in the output of SHOW SLAVE STATUS are now cleared by CHANGE MASTER and when the slave SQL thread starts. (Bug #986)
• A documentation mistake: It said that RESET SLAVE does not change connection information (master host, port, user, and password), whereas it does. The statement resets these to the startup options (master-host etc) if there were some. (Bug #985)
• SHOW SLAVE STATUS now shows correct information (master host, port, user, and password) after RESET SLAVE (that is, it shows the new values, which are copied from the startup options if there were some). (Bug #985)
• Disabled propagation of the original master's log position for events because this caused unexpected values for Exec_master_log_pos and problems with MASTER_POS_WAIT() in A->B->C replication setup. (Bug #1086)
• Fixed a segfault in mysqlbinlog when --position=x was used with x being between a Create_file event and its fellow Append_block, Exec_load or Delete_file events. (Bug #1091)
• mysqlbinlog printed superfluous warnings when using --database, which caused syntax errors when piped to mysql. (Bug #1092)
• Made mysqlbinlog --database filter LOAD DATA INFILE too (previously, it filtered all queries except LOAD DATA INFILE). (Bug #1093)
• mysqlbinlog in some cases forgot to put a leading '#' in front of the original LOAD DATA INFILE (this command is displayed only for information, not to be run; it is later reworked to LOAD DATA LOCAL with a different filename, for execution by mysql). (Bug #1096)
• binlog-do-db and binlog-ignore-db incorrectly filtered LOAD DATA INFILE (it was half-written to the binary log). This resulted in a corrupted binary log, which could cause the slave to stop with an error. (Bug #1100)
• When, in a transaction, a transactional table (such as an InnoDB table) was updated, and later in the same transaction a non-transactional table (such as a MyISAM table) was updated using the updated content of the transactional table (with INSERT ... SELECT for example), the queries were written to the binary log in an incorrect order. (Bug #873)
• When, in a transaction, INSERT ... SELECT updated a non-transactional table, and ROLLBACK was issued, no error was returned to the client. Now the client is warned that some changes could not be rolled back, as this was already the case for normal INSERT. (Bug #1113)
• Fixed a potential bug: When STOP SLAVE was run while the slave SQL thread was in the middle of a transaction, and then CHANGE MASTER was used to point the slave to some non-transactional statement, the SQL slave thread could get confused (because it would still think, from the past, that it was in a transaction).

D.3.3 Changes in release 4.0.14 (18 Jul 2003)

Functionality added or changed:

• A documentation change: Function INTERVAL(NULL, ...) returns -1.
• Enabled INSERT from SELECT when the table into which the records are inserted is also a table listed in the SELECT.
• Allow CREATE TABLE and INSERT from any UNION.
• The SQL_CALC_FOUND_ROWS option now always returns the total number of rows for any UNION.
• Removed --table option from mysqlbinlog to avoid repeating mysqldump functionality.
• Changed optimiser slightly to prefer index lookups over full table scans in some boundary cases.
• Added thread-specific max_seeks_for_key variable that can be used to force the optimiser to use keys instead of table scans even if the cardinality of the index is low.
• Added optimisation that converts LEFT JOIN to normal join in some cases.
• A documentation change: added a paragraph about failover in replication (how to use a surviving slave as the new master, how to resume to the original setup). See section Replication FAQ.
• A documentation change: added warning notes about safe use of the CHANGE MASTER command. See section CHANGE MASTER TO master_def_list (slave).
• MySQL now issues a warning (not an error, as in 4.0.13) when it opens a table that was created with MySQL 4.1.
• Added --nice option to mysqld_safe to allow setting the niceness of the mysqld process. (Thanks to Christian Hammers for providing the initial patch.) (Bug #627)
• Added --read-only option to cause mysqld to allow no updates except from slave threads or from users with the SUPER privilege. (Original patch from Markus Benning).
• SHOW BINLOG EVENTS FROM x where x is strictly less than 4 now silently converts x to 4 instead of printing an error. The same change was done for CHANGE MASTER TO MASTER_LOG_POS=x and CHANGE MASTER TO RELAY_LOG_POS=x.
• mysqld now only adds an interrupt handler for the SIGINT signal if you start it with the new --gdb option. This is because some MySQL users encountered strange problems when they accidentally sent SIGINT to mysqld threads.
• RESET SLAVE now clears the Last_errno and Last_error fields in the output of SHOW SLAVE STATUS.
• Added max_relay_log_size variable; the relay log will be rotated automatically when its size exceeds max_relay_log_size. But if max_relay_log_size is 0 (the default), max_binlog_size will be used (as in older versions). max_binlog_size still applies to binary logs in any case.
• FLUSH LOGS now rotates relay logs in addition to the other types of logs it already rotated.

Bugs fixed:

• Comparison/sorting for latin1_de character set was rewritten. The old algorithm could not handle cases like "sä" > "ßa". See section German character set. In rare cases it resulted in table corruption.
• Fixed a problem with the password prompt on Windows. (Bug #683)
• ALTER TABLE ... UNION=(...) for MERGE table is now allowed even if some underlying MyISAM tables are read-only. (Bug #702)
• Fixed a problem with CREATE TABLE t1 SELECT x'41'. (Bug #801)
• Removed some incorrect lock warnings from the error log.
• Fixed memory overrun when doing REPAIR on a table with a multi-part auto_increment key where one part was a packed CHAR.
• Fixed a probable race condition in the replication code that could potentially lead to INSERT statements not being replicated in the event of a FLUSH LOGS command or when the binary log exceeds max_binlog_size. (Bug #791)
• Fixed a crashing bug in INTERVAL and GROUP BY or DISTINCT. (Bug #807)
• Fixed bug in mysqlhotcopy so it actually aborts for unsuccessful table copying operations. Fixed another bug so that it succeeds when there are thousands of tables to copy. (Bug #812)
• Fixed problem with mysqlhotcopy failing to read options from option files. (Bug #808)
• Fixed bugs in optimiser that sometimes prevented MySQL from using FULLTEXT indexes even though it was possible (for example, in SELECT * FROM t1 WHERE MATCH a,b AGAINST("index") > 0).
• Fixed a bug with "table is full" in UNION operations.
• Fixed a security problem that enabled users with no privileges to obtain information on the list of existing databases by using SHOW TABLES and similar commands.
• Fixed a stack problem on UnixWare/OpenUnix.
• Fixed a configuration problem on UnixWare/OpenUNIX and OpenServer.
• Fixed a stack overflow problem in password verification.
• Fixed a problem with max_user_connections.
• HANDLER without an index now works properly when a table has deleted rows. (Bug #787)
• Fixed a bug with LOAD DATA in mysqlbinlog. (Bug #670)
• Fixed that SET CHARACTER SET DEFAULT works. (Bug #462)
• Fixed MERGE table behaviour in ORDER BY ... DESC queries. (Bug #515)
• Fixed server crash on PURGE MASTER LOGS or SHOW MASTER LOGS when the binary log is off. (Bug #733)
• Fixed password-checking problem on Windows. (Bug #464)
• Fixed the bug in comparison of a DATETIME column and an integer constant. (Bug #504)
• Fixed remote mode of mysqlbinlog. (Bug #672)
• Fixed ERROR 1105: Unknown error that occurred for some SELECT queries, where a column that was declared as NOT NULL was compared with an expression that took NULL value.
• Changed timeout in mysql_real_connect() to use poll() instead of select() to work around problem with many open files in the client.
• Fixed incorrect results from MATCH ... AGAINST used with a LEFT JOIN query.
• Fixed a bug that limited the maximum value for mysqld variables to 4294967295 when they are specified on the command line.
• Fixed a bug that sometimes caused spurious "Access denied" errors in HANDLER ... READ statements, when a table is referenced via an alias.
• Fixed portability problem with safe_malloc, which caused MySQL to give "Freeing wrong aligned pointer" errors on SCO 3.2.
• ALTER TABLE ... ENABLE/DISABLE KEYS could cause a core dump when done after an INSERT DELAYED statement on the same table.
• Fixed problem with conversion of localtime to GMT where some times resulted in different (but correct) timestamps. Now MySQL should use the smallest possible timestamp value in this case. (Bug #316)
• Very small query cache sizes could crash mysqld. (Bug #549)
• Fixed a bug (accidentally introduced by us but present only in version 4.0.13) that made INSERT ... SELECT into an AUTO_INCREMENT column not replicate well. This bug is in the master, not in the slave. (Bug #490)
• Fixed a bug: When an INSERT ... SELECT statement inserted rows into a non-transactional table, but failed at some point (for example, due to a "Duplicate key" error), the query was not written to the binlog. Now it is written to the binlog, with its error code, as all other queries are. About the slave-skip-errors option for how to handle partially completed queries in the slave, see Replication Options in `my.cnf'. (Bug #491)
• SET FOREIGN_KEY_CHECKS=0 was not replicated properly. The fix probably will not be backported to 3.23.
• On a slave, LOAD DATA INFILE which had no IGNORE or REPLACE clause on the master, was replicated with IGNORE. While this is not a problem if the master and slave data are identical (a LOAD that produces no duplicate conflicts on the master will produce none on the slave anyway), which is true in normal operation, it is better for debugging not to silently add the IGNORE. That way, you can get an error message on the slave and discover that for some reason, the data on master and slave are different and investigate why. (Bug #571)
• On a slave, LOAD DATA INFILE printed an incomplete "Duplicate entry '%-.64s' for key %d"' message (the key name and value were not mentioned) in case of duplicate conflict (which does not happen in normal operation). (Bug #573)
• When using a slave compiled with --debug, CHANGE MASTER TO RELAY_LOG_POS could cause a debug assertion failure. (Bug #576)
• When doing a LOCK TABLES WRITE on an InnoDB table, commit could not happen, if the query was not written to the binary log (for example, if --log-bin was not used, or binlog-ignore-db was used). (Bug #578)
• If a 3.23 master had open temporary tables that had been replicated to a 4.0 slave, and the binlog got rotated, these temporary tables were immediately dropped by the slave (which caused problems if the master used them subsequently). This bug had been fixed in 4.0.13, but in a manner which caused an unlikely inconvenience: if the 3.23 master died brutally (power failure), without having enough time to automatically write DROP TABLE statements to its binlog, then the 4.0.13 slave would not notice the temporary tables have to be dropped, until the slave mysqld server is restarted. This minor inconvenience is fixed in 3.23.57 and 4.0.14 (meaning the master must be upgraded to 3.23.57 and the slave to 4.0.14 to remove the inconvenience). (Bug #254)
• If MASTER_POS_WAIT() was waiting, and the slave was idle, and the SQL slave thread terminated, MASTER_POS_WAIT() would wait forever. Now when the SQL slave thread terminates, MASTER_POS_WAIT() immediately returns NULL ("slave stopped"). (Bug #651)
• After RESET SLAVE; START SLAVE;, the Relay_log_space value displayed by SHOW SLAVE STATUS was too big by four bytes. (Bug #763)
• If a query was ignored on the slave (because of replicate-ignore-table and other similar rules), the slave still checked if the query got the same error code (0, no error) as on the master. So if the master had an error on the query (for example, "Duplicate entry" in a multiple-row insert), then the slave stopped and warned that the error codes didn't match. (Bug #797)

D.3.4 Changes in release 4.0.13 (16 May 2003)

Functionality added or changed:

• PRIMARY KEY now implies NOT NULL. (Bug #390)
• The Windows binary packages are now compiled with --enable-local-infile to match the Unix build configuration.
• Removed timing of tests from mysql-test-run. time does not accept all required parameters on many platforms (for example, QNX) and timing the tests is not really required (it's not a benchmark anyway).
• SHOW MASTER STATUS and SHOW SLAVE STATUS required the SUPER privilege; now they accept REPLICATION CLIENT as well. (Bug #343)
• Added multi-threaded MyISAM repair optimisation and myisam_repair_threads variable to enable it. See section myisam_repair_threads.
• Added innodb_max_dirty_pages_pct variable which controls amount of dirty pages allowed in InnoDB buffer pool.
• CURRENT_USER() and Access denied error messages now report the hostname exactly as it was specified in the GRANT command.
• Removed benchmark results from the source and binary distributions. They are still available in the BK source tree, though.
• InnoDB tables now support ANALYZE TABLE.
• MySQL now issues an error when it opens a table that was created with MySQL 4.1.
• Option --new now changes binary items (0xFFDF) to be treated as binary strings instead of numbers by default. This fixes some problems with character sets where it's convenient to input the string as a binary item. After this change you have to convert the binary string to INTEGER with a CAST if you want to compare two binary items with each other and know which one is bigger than the other. SELECT CAST(0xfeff AS UNSIGNED) < CAST(0xff AS UNSIGNED). This will be the default behaviour in MySQL 4.1. (Bug #152)
• Enabled delayed_insert_timeout on Linux (most modern glibc libraries have a fixed pthread_cond_timedwait). (Bug #211)
• Don't create more insert delayed threads than given by max_insert_delayed_threads. (Bug #211)
• Changed UPDATE ... LIMIT to also count accepted, but not changed rows.
• Tuned optimiser to favour clustered index over table scan.
• BIT_AND() and BIT_OR() now return an unsigned 64 bit value.
• Added warnings to error log of why a secure connection failed (when running with --log-warnings).
• Deprecated options --skip-symlink and --use-symbolic-links and replaced these with --symbolic-links.
• The default option for innodb_flush_log_at_trx_commit was changed from 0 to 1 to make InnoDB tables ACID by default. See section InnoDB start.
• Added a feature to SHOW KEYS to display keys that are disabled by ALTER TABLE DISABLE KEYS command.
• When using a non-existing table type with CREATE TABLE, first try if the default table type exists before falling back to MyISAM.
• Added MEMORY as an alias for HEAP.
• Renamed function rnd to my_rnd as the name was too generic and is an exported symbol in libmysqlclient (thanks to Dennis Haney for the initial patch).
• Portability fix: renamed `include/dbug.h' to `include/my_debug.h'.
• mysqldump no longer silently deletes the binlogs when called with --master-data or --first-slave; while this behaviour was convenient for some users, others may suffer from it. Now one has to explicitely ask for this deletion with the new --delete-master-logs option.
• If the slave is configured (using for example replicate-wild-ignore-table=mysql.%) to exclude mysql.user, mysql.host, mysql.db, mysql.tables_priv and mysql.columns_priv from replication, then GRANT and REVOKE will not be replicated.

Bugs fixed:

• Logged Access denied error message had wrong Using password value. (Bug #398)
• Fixed bug with NATURAL LEFT JOIN, NATURAL RIGHT JOIN and RIGHT JOIN when using many joined tables. The problem was that the JOIN method was not always associated with the tables surrounding the JOIN method. If you have a query that uses many RIGHT JOIN or NATURAL ... JOINS you should check that they work as you expected after upgrading MySQL to this version. (Bug #291)
• mysql command line client no longer looks for \* commands inside backtick-quoted strings.
• Fixed Unknown error when using UPDATE ... LIMIT. (Bug #373)
• Fixed problem with ansi mode and GROUP BY with constants. (Bug #387)
• Fixed bug with UNION and OUTER JOIN. (Bug #386)
• Fixed bug if one used a multi-table UPDATE and the query required a temporary table bigger than tmp_table_size. (Bug #286)
• Run mysql_install_db with the -IN-RPM option for the Mac OS X installation to not fail on systems with improperly configured hostname configurations.
• LOAD DATA INFILE will now read 000000 as a zero date instead as "2000-00-00".
• Fixed bug that caused DELETE FROM table WHERE const_expression always to delete the whole table (even if expression result was false). (Bug #355)
• Fixed core dump bug when using FORMAT('nan',#). (Bug #284)
• Fixed name resolution bug with HAVING ... COUNT(DISTINCT ...).
• Fixed wrong result from truncation operator (*) in MATCH ... AGAINST() in some complex joins.
• Fixed a crash in REPAIR ... USE_FRM command, when used on read-only, nonexisting table or a table with a crashed index file.
• Fixed a crashing bug in mysql monitor program. It occurred if program was started with --no-defaults, with a prompt that contained hostname and connection to non-existing db was requested
• Fixed problem when comparing a key for a multi-byte-character set. (Bug #152)
• Fixed bug in LEFT, RIGHT and MID when used with multi-byte character sets and some GROUP BY queries. (Bug #314)
• Fix problem with ORDER BY being discarded for some DISTINCT queries. (Bug #275)
• Fixed that SET SQL_BIG_SELECTS=1 works as documented (This corrects a new bug introduced in 4.0)
• Fixed some serious bugs in UPDATE ... ORDER BY. (Bug #241)
• Fixed unlikely problem in optimising WHERE clause with constant expression like in WHERE 1 AND (a=1 AND b=1).
• Fixed that SET SQL_BIG_SELECTS=1 works again.
• Introduced proper backtick quoting for db.table in SHOW GRANTS.
• FULLTEXT index stopped working after ALTER TABLE that converts TEXT field to CHAR. (Bug #283)
• Fixed a security problem with SELECT and wildcarded select list, when user only had partial column SELECT privileges on the table.
• Mark a MyISAM table as "analyzed" only when all the keys are indeed analyzed.
• Only ignore world-writeable `my.cnf' files that are regular files (and not, for example, named pipes or character devices).
• Fixed few smaller issues with SET PASSWORD.
• Fixed error message which contained deprecated text.
• Fixed a bug with two NATURAL JOINs in the query.
• SUM() didn't return NULL when there was no rows in result or when all values was NULL.
• On Unix symbolic links handling was not enabled by default and there was no way to turn this on.
• Added missing dashes to parameter --open-files-limit in mysqld_safe. (Bug #264)
• Fixed wrong hostname for TCP/IP connections displayed in SHOW PROCESSLIST.
• Fixed a bug with NAN in FORMAT(...) function ...
• Fixed a bug with improperly cached database privileges.
• Fixed a bug in ALTER TABLE ENABLE / DISABLE KEYS which failed to force a refresh of table data in the cache.
• Fixed bugs in replication of LOAD DATA INFILE for custom parameters (ENCLOSED, TERMINATED and so on) and temporary tables. (Bug #183, Bug #222)
• Fixed a replication bug when the master is 3.23 and the slave 4.0: the slave lost the replicated temporary tables if FLUSH LOGS was issued on the master. (Bug #254)
• Fixed a bug when doing LOAD DATA INFILE IGNORE : when reading the binary log, mysqlbinlog and the replication code read REPLACE instead of IGNORE. This could make the slave's table become different from the master's table. (Bug #218)
• Fixed a deadlock when relay_log_space_limit was set to a too small value. (Bug #79)
• Fixed a bug in HAVING clause when an alias is used from the select list.
• Fixed overflow bug in MyISAM when a row is inserted into a table with a large number of columns and at least one BLOB/TEXT column. Bug was caused by incorrect calculation of the needed buffer to pack data.
• Fixed a bug when SELECT @nonexistent_variable caused the error in client - server protocol due to net_printf() being sent to the client twice.
• Fixed a bug in setting SQL_BIG_SELECTS option.
• Fixed a bug in SHOW PROCESSLIST which only displayed a localhost in the "Host" column. This was caused by a glitch that only used current thread information instead of information from the linked list of threads.
• Removed unnecessary Mac OS X helper files from server RPM. (Bug #144)
• Allow optimisation of multiple-table update for InnoDB tables as well.
• Fixed a bug in multiple-table updates that caused some rows to be updated several times.
• Fixed a bug in mysqldump when it was called with --master-data: the CHANGE MASTER TO commands appended to the SQL dump had wrong coordinates. (Bug #159)
• Fixed a bug when an updating query using USER() was replicated on the slave ; this caused segfault on the slave. (Bug #178). USER() is still badly replicated on the slave (it is replicated to "").

D.3.5 Changes in release 4.0.12 (15 Mar 2003: Production)

Functionality added or changed:

• mysqld no longer reads options from world-writeable config files.
• Integer values between 9223372036854775807 and 9999999999999999999 are now regarded as unsigned longlongs, not as floats. This makes these values work similar to values between 10000000000000000000 and 18446744073709551615.
• SHOW PROCESSLIST will now include the client TCP port after the hostname to make it easier to know from which client the request originated.

Bugs fixed:

• Fixed mysqld crash on extremely small values of sort_buffer variable.
• INSERT INTO u SELECT ... FROM t was written too late to the binary log if t was very frequently updated during the execution of this query. This could cause a problem with mysqlbinlog or replication. The master must be upgraded, not the slave. (Bug #136)
• Fixed checking of random part of WHERE clause. (Bug #142)
• Fixed a bug with multiple-table updates with InnoDB tables. This bug occurred as, in many cases, InnoDB tables can not be updated "on the fly," but offsets to the records have to be stored in a temporary table.
• Added missing file mysql_secure_installation to the server RPM subpackage. (Bug #141)
• Fixed MySQL (and myisamchk) crash on artificially corrupted .MYI files.
• Don't allow BACKUP TABLE to overwrite existing files.
• Fixed a bug with multi-table UPDATE statements when user had all privileges on the database where tables are located and there were any entries in tables_priv table, that is, grant_option was true.
• Fixed a bug that allowed a user with table or column grants on some table, TRUNCATE any table in the same database.
• Fixed deadlock when doing LOCK TABLE followed by DROP TABLE in the same thread. In this case one could still kill the thread with KILL.
• LOAD DATA LOCAL INFILE was not properly written to the binary log (hence not properly replicated). (Bug #82)
• RAND() entries were not read correctly by mysqlbinlog from the binary log which caused problems when restoring a table that was inserted with RAND(). INSERT INTO t1 VALUES(RAND()). In replication this worked ok.
• SET SQL_LOG_BIN=0 was ignored for INSERT DELAYED queries. (Bug #104)
• SHOW SLAVE STATUS reported too old positions (columns Relay_Master_Log_File and Exec_master_log_pos) for the last executed statement from the master, if this statement was the COMMIT of a transaction. The master must be upgraded for that, not the slave. (Bug #52)
• LOAD DATA INFILE was not replicated by the slave if replicate_*_table was set on the slave. (Bug #86)
• After RESET SLAVE, the coordinates displayed by SHOW SLAVE STATUS looked un-reset (though they were, but only internally). (Bug #70)
• Fixed query cache invalidation on LOAD DATA.
• Fixed memory leak on ANALYZE procedure with error.
• Fixed a bug in handling CHAR(0) columns that could cause wrong results from the query.
• Fixed rare bug with wrong initialisation of AUTO_INCREMENT column, as a secondary column in a multi-column key (see section AUTO_INCREMENT on secondary column in a multi-column key), when data was inserted with INSERT ... SELECT or LOAD DATA into an empty table.
• On Windows, STOP SLAVE didn't stop the slave until the slave got one new command from the master (this bug has been fixed for MySQL 4.0.11 by releasing updated 4.0.11a Windows packages, which include this individual fix on top of the 4.0.11 sources). (Bug #69)
• Fixed a crash when no database was selected and LOAD DATA command was issued with full table name specified, including database prefix.
• Fixed a crash when shutting down replication on some platforms (for example, Mac OS X).
• Fixed a portability bug with pthread_attr_getstacksize on HP-UX 10.20 (Patch was also included in 4.0.11a sources).
• Fixed the bigint test to not fail on some platforms (for example, HP-UX and Tru64) due to different return values of the atof() function.
• Fixed the rpl_rotate_logs test to not fail on certain platforms (e.g. Mac OS X) due to a too long file name (changed slave-master-info.opt to .slave-mi).

D.3.6 Changes in release 4.0.11 (20 Feb 2003)

Functionality added or changed:

• NULL is now sorted LAST if you use ORDER BY ... DESC (as it was before MySQL 4.0.2). This change was required to comply with the SQL-99 standard. (The original change was made because we thought that SQL-99 required NULL to be always sorted at the same position, but this was incorrect).
• Added START TRANSACTION (SQL-99 syntax) as alias for BEGIN. This is recommended to use instead of BEGIN to start a transaction.
• Added OLD_PASSWORD() as a synonym for PASSWORD().
• Allow keyword ALL in group functions.
• Added support for some new INNER JOIN and JOIN syntaxes. For example, SELECT * FROM t1 INNER JOIN t2 didn't work before.
• Novell NetWare 6.0 porting effort completed, Novell patches merged into the main source tree.

Bugs fixed:

• Fixed problem with multiple-table delete and InnoDB tables.
• Fixed a problem with BLOB NOT NULL columns used with IS NULL.
• Re-added missing pre- and post(un)install scripts to the Linux RPM packages (they were missing after the renaming of the server subpackage).
• Fixed that table locks are not released with multi-table updates and deletes with InnoDB storage engine.
• Fixed bug in updating BLOB columns with long strings.
• Fixed integer-wraparound when giving big integer (>= 10 digits) to function that requires an unsigned argument, like CREATE TABLE (...) AUTO_INCREMENT=#.
• MIN(key_column) could in some cases return NULL on a column with NULL and other values.
• MIN(key_column) and MAX(key_column) could in some cases return wrong values when used in OUTER JOIN.
• MIN(key_column) and MAX(key_column) could return wrong values if one of the tables was empty.
• Fixed rare crash in compressed MyISAM tables with blobs.
• Fixed bug in using aggregate functions as argument for INTERVAL, CASE, FIELD, CONCAT_WS, ELT and MAKE_SET functions.
• When running with --lower-case-table-names (default on Windows) and you had tables or databases with mixed case on disk, then executing SHOW TABLE STATUS followed with DROP DATABASE or DROP TABLE could fail with Errcode 13.

D.3.7 Changes in release 4.0.10 (29 Jan 2003)

Functionality added or changed:

• Added option --log-error[=file_name] to mysqld_safe and mysqld. This option will force all error messages to be put in a log file if the option --console is not given. On Windows --log-error is enabled as default, with a default name of host_name.err if the name is not specified.
• Changed some things from Warning: to Note: in the log files.
• The mysqld server should now compile on NetWare.
• Added optimisation that if one does GROUP BY ... ORDER BY NULL then result is not sorted.
• New --ft-stopword-file command-line option for mysqld to replace/disable the built-in stopword list that is used in full-text searches. See section ft_stopword_file.
• Changed default stack size from 64K to 192K; This fixes a core dump problem on Red Hat 8.0 and other systems with a glibc that requires a stack size larger than 128K for gethostbyaddr() to resolve a hostname. You can fix this for earlier MySQL versions by starting mysqld with --thread-stack=192K.
• Added mysql_waitpid to the binary distribution and the MySQL-client RPM subpackage (required for mysql-test-run).
• Renamed the main MySQL RPM package to MySQL-server. When updating from an older version, MySQL-server.rpm will simply replace MySQL.rpm.
• If a slave is configured with replicate_wild_do_table=db.% or replicate_wild_ignore_table=db.%, these rules will be applied to CREATE/DROP DATABASE too.
• Added timeout value for MASTER_POS_WAIT().

Bugs fixed:

• Fixed initialisation of the random seed for newly created threads to give a better rand() distribution from the first call.
• Fixed a bug that caused mysqld to hang when a table was opened with the HANDLER command and then dropped without being closed.
• Fixed bug in logging to binary log (which affects replication) a query that inserts a NULL in an auto_increment field and also uses LAST_INSERT_ID().
• Fixed an unlikely bug that could cause a memory overrun when using ORDER BY constant_expression.
• Fixed a table corruption in myisamchk's parallel repair mode.
• Fixed bug in query cache invalidation on simple table renaming.
• Fixed bug in mysqladmin --relative.
• On some 64 bit systems, show status reported a strange number for Open_files and Open_streams.
• Fixed wrong number of columns in EXPLAIN on empty table.
• Fixed bug in LEFT JOIN that caused zero rows to be returned in the case the WHERE condition was evaluated as FALSE after reading const tables. (Unlikely condition).
• FLUSH PRIVILEGES didn't correctly flush table/column privileges when mysql.tables_priv is empty.
• Fixed bug in replication when using LOAD DATA INFILE one a file that updated and auto_increment field with NULL or 0. This bug only affected MySQL 4.0 masters (not slaves or MySQL 3.23 masters). NOTE: If you have a slave that has replicated a file with generated auto_increment fields then the slave data is corrupted and you should reinitialise the affected tables from the master.
• Fixed possible memory overrun when sending a blob > 16M to the client.
• Fixed wrong error message when setting a NOT NULL field to an expression that returned NULL.
• Fixed core dump bug in str LIKE "%other_str%" where str or other_str contained characters >= 128.
• Fixed bug: When executing on master LOAD DATA and InnoDB failed with table full error the binary log was corrupted.

D.3.8 Changes in release 4.0.9 (09 Jan 2003)

Functionality added or changed:

• OPTIMIZE TABLE will for MyISAM tables treat all NULL values as different when calculating cardinality. This helps in optimising joins between tables where one of the tables has a lot of NULL values in a indexed column:

  SELECT * from t1,t2 where t1.a=t2.key_with_a_lot_of_null;

• Added join operator FORCE INDEX (key_list). This acts likes USE INDEX (key_list) but with the addition that a table scan is assumed to be VERY expensive. One bad thing with this is that it makes FORCE a reserved word.
• Reset internal row buffer in MyISAM after each query. This will reduce memory in the case you have a lot of big blobs in a table.

Bugs fixed:

• A security patch in 4.0.8 causes the mysqld server to die if the remote hostname can't be resolved. This is now fixed.
• Fixed crash when replication big LOAD DATA INFILE statement that caused log rotation.

D.3.9 Changes in release 4.0.8 (07 Jan 2003)

Functionality added or changed:

• Default max_packet_length for libmysqld.c is now 1024*1024*1024.
• One can now specify max_allowed_packet in a file ready by mysql_options(MYSQL_READ_DEFAULT_FILE). for clients.
• When sending a too big packet to the server with the not compressed protocol, the client now gets an error message instead of a lost connection.
• We now send big queries/result rows in bigger hunks, which should give a small speed improvement.
• Fixed some bugs with the compressed protocol for rows > 16M.
• InnoDB tables now also support ON UPDATE CASCADE in FOREIGN KEY constraints. See the InnoDB section in the manual for the InnoDB changelog.

Bugs fixed:

• Fixed bug in ALTER TABLE with BDB tables.
• Fixed core dump bug in QUOTE() function.
• Fixed a bug in handling communication packets bigger than 16M. Unfortunately this required a protocol change; If you upgrade the server to 4.0.8 and above and have clients that uses packets >= 255*255*255 bytes (=16581375) you must also upgrade your clients to at least 4.0.8. If you don't upgrade, the clients will hang when sending a big packet.
• Fixed bug when sending blobs longer than 16M to client.
• Fixed bug in GROUP BY when used on BLOB column with NULL values.
• Fixed a bug in handling NULL values in CASE ... WHEN ...

D.3.10 Changes in release 4.0.7 (20 Dec 2002)

Functionality added or changed:

• mysqlbug now also reports the compiler version used for building the binaries (if the compiler supports the option --version).

Bugs fixed:

• Fixed compilation problems on OpenUnix and HPUX 10.20.
• Fixed some optimisation problems when compiling MySQL with -DBIG_TABLES on a 32 bit system.
• mysql_drop_db() didn't check permissions properly so anyone could drop another users database. DROP DATABASE is checked properly.

D.3.11 Changes in release 4.0.6 (14 Dec 2002: Gamma)

Functionality added or changed:

• Added syntax support for CHARACTER SET xxx and CHARSET=xxx table options (to be able to read table dumps from 4.1).
• Fixed replication bug that caused the slave to loose its position in some cases when the replication log was rotated.
• Fixed that a slave will restart from the start of a transaction if it's killed in the middle of one.
• Moved the manual pages from `man' to `man/man1' in the binary distributions.
• The default type returned by IFNULL(A,B) is now set to be the more 'general' of the types of A and B. (The order is STRING, REAL or INTEGER).
• Moved the mysql.server startup script in the RPM packages from `/etc/rc.d/init.d/mysql' to `/etc/init.d/mysql' (which almost all current Linux distributions support for LSB compliance).
• Added Qcache_lowmem_prunes status variable (number of queries that were deleted from cache because of low memory).
• Fixed mysqlcheck so it can deal with table names containing dashes.
• Bulk insert optimisation (see section bulk_insert_buffer_size) is no longer used when inserting small (less than 100) number of rows.
• Optimisation added for queries like SELECT ... FROM merge_table WHERE indexed_column=constant_expr.
• Added functions LOCALTIME and LOCALTIMESTAMP as synonyms for NOW().
• CEIL is now an alias for CEILING.
• The CURRENT_USER() function can be used to get a user@host value as it was matched in the GRANT system. See section CURRENT_USER().
• Fixed CHECK constraints to be compatible with SQL-99. This made CHECK a reserved word. (Checking of CHECK constraints is still not implemented).
• Added CAST(... as CHAR).
• Added PostgreSQL compatible LIMIT syntax: SELECT ... LIMIT row_count OFFSET offset
• mysql_change_user() will now reset the connection to the state of a fresh connect (Ie, ROLLBACK any active transaction, close all temporary tables, reset all user variables etc..)
• CHANGE MASTER and RESET SLAVE now require that slave threads be both already stopped; these commands will return an error if at least one of these two threads is running.

Bugs fixed:

• Fixed number of found rows returned in multi table updates
• Make --lower-case-table-names default on Mac OS X as the default file system (HFS+) is case insensitive. See section Case Sensitivity in Names.
• Transactions in AUTOCOMMIT=0 mode didn't rotate binary log.
• A fix for the bug in a SELECT with joined tables with ORDER BY and LIMIT clause when filesort had to be used. In that case LIMIT was applied to filesort of one of the tables, although it could not be. This fix solved problems with LEFT JOIN too.
• mysql_server_init() now makes a copy of all arguments. This fixes a problem when using the embedded server in C# program.
• Fixed buffer overrun in libmysqlclient library that allowed a malicious MySQL server to crash the client application.
• Fixed security-related bug in mysql_change_user() handling. All users are strongly recommended to upgrade to version 4.0.6.
• Fixed bug that prevented --chroot command-line option of mysqld from working.
• Fixed bug in phrase operator "..." in boolean full-text search.
• Fixed bug that caused OPTIMIZE TABLE to corrupt the table under some rare circumstances.
• Part rewrite of multi-table-update to optimise it, make it safer and more bug free.
• LOCK TABLES now works together with multi-table-update and multi-table-delete.
• --replicate-do=xxx didn't work for UPDATE commands. (Bug introduced in 4.0.0)
• Fixed shutdown problem on Mac OS X.
• Major InnoDB bugs in REPLACE, AUTO_INCREMENT, INSERT INTO ... SELECT ... were fixed. See the InnoDB changelog in the InnoDB section of the manual.
• RESET SLAVE caused a crash if the slave threads were running.

D.3.12 Changes in release 4.0.5 (13 Nov 2002)

Functionality added or changed:

• Port number was added to host name (if it is known) in SHOW PROCESSLIST command
• Changed handling of last argument in WEEK() so that one can get week number according to the ISO 8601 specification. (Old code should still work).
• Fixed that INSERT DELAYED threads doesn't hang on Waiting for INSERT when one sends a SIGHUP to mysqld.
• Change that AND works according to SQL-99 when it comes to NULL handling. In practice, this only affects queries where you do something like WHERE ... NOT (NULL AND 0).
• mysqld will now resolve basedir to its full path (with realpath()). This enables one to use relative symlinks to the MySQL installation directory. This will however cause show variables to report different directories on systems where there is a symbolic link in the path.
• Fixed that MySQL will not use index scan on index disabled with IGNORE INDEX or USE INDEX. to be ignored.
• Added --use-frm option to mysqlcheck. When used with REPAIR, it gets the table structure from the .frm file, so the table can be repaired even if the .MYI header is corrupted.
• Fixed bug in MAX() optimisation when used with JOIN and ON expressions.
• Added support for reading of MySQL 4.1 table definition files.
• BETWEEN behaviour changed (see section Comparison Operators). Now datetime_col BETWEEN timestamp AND timestamp should work as expected.
• One can create TEMPORARY MERGE tables now.
• DELETE FROM myisam_table now shrinks not only the `.MYD' file but also the `.MYI' file.
• When one uses the --open-files-limit=# option to mysqld_safe it's now passed on to mysqld.
• Changed output from EXPLAIN from 'where used' to 'Using where' to make it more in line with other output.
• Removed variable safe_show_database as it was no longer used.
• Updated source tree to be built using automake 1.5 and libtool 1.4.
• Fixed an inadvertently changed option (--ignore-space) back to the original --ignore-spaces in mysqlclient. (Both syntaxes will work).
• Don't require UPDATE privilege when using REPLACE.
• Added support for DROP TEMPORARY TABLE ..., to be used to make replication safer.
• When transactions are enabled, all commands that update temporary tables inside a BEGIN/COMMIT are now stored in the binary log on COMMIT and not stored if one does ROLLBACK. This fixes some problems with non-transactional temporary tables used inside transactions.
• Allow braces in joins in all positions. Formerly, things like SELECT * FROM (t2 LEFT JOIN t3 USING (a)), t1 worked, but not SELECT * FROM t1, (t2 LEFT JOIN t3 USING (a)). Note that braces are simply removed, they do not change the way the join is executed.
• InnoDB now supports also isolation levels READ UNCOMMITTED and READ COMMITTED. For a detailed InnoDB changelog, see InnoDB Change History in this manual.

Bugs fixed:

• Fixed bug in MAX() optimisation when used with JOIN and ON expressions.
• Fixed that INSERT DELAY threads don't hang on Waiting for INSERT when one sends a SIGHUP to mysqld.
• Fixed that MySQL will not use an index scan on an index that has been disabled with IGNORE INDEX or USE INDEX.
• Corrected test for root user in mysqld_safe.
• Fixed error message issued when storage engine cannot do CHECK or REPAIR.
• Fixed rare core dump problem in complicated GROUP BY queries that didn't return any result.
• Fixed mysqlshow to work properly with wildcarded database names and with database names that contain underscores.
• Portability fixes to get MySQL to compile cleanly with Sun Forte 5.0.
• Fixed MyISAM crash when using dynamic-row tables with huge numbers of packed fields.
• Fixed query cache behaviour with BDB transactions.
• Fixed possible floating point exception in MATCH relevance calculations.
• Fixed bug in full-text search IN BOOLEAN MODE that made MATCH to return incorrect relevance value in some complex joins.
• Fixed a bug that limited MyISAM key length to a value slightly less that 500. It is exactly 500 now.
• Fixed that GROUP BY on columns that may have a NULL value doesn't always use disk based temporary tables.
• The filename argument for the --des-key-file argument to mysqld is interpreted relative to the data directory if given as a relative pathname.
• Removed a condition that temp table with index on column that can be NULL has to be MyISAM. This was okay for 3.23, but not needed in 4.*. This resulted in slowdown in many queries since 4.0.2.
• Small code improvement in multi-table updates.
• Fixed a newly introduced bug that caused ORDER BY ... LIMIT row_count to not return all rows.
• Fixed a bug in multi-table deletes when outer join is used on an empty table, which gets first to be deleted.
• Fixed a bug in multi-table updates when a single table is updated.
• Fixed bug that caused REPAIR TABLE and myisamchk to corrupt FULLTEXT indexes.
• Fixed bug with caching the mysql grant table database. Now queries in this database are not cached in the query cache.
• Small fix in mysqld_safe for some shells.
• Give error if a MyISAM MERGE table has more than 2 ^ 32 rows and MySQL was not compiled with -DBIG_TABLES.
• Fixed some ORDER BY ... DESC problems with InnoDB tables.

D.3.13 Changes in release 4.0.4 (29 Sep 2002)

• Fixed bug where GRANT/REVOKE failed if hostname was given in non-matching case.
• Don't give warning in LOAD DATA INFILE when setting a timestamp to a string value of '0'.
• Fixed bug in myisamchk -R mode.
• Fixed bug that caused mysqld to crash on REVOKE.
• Fixed bug in ORDER BY when there is a constant in the SELECT statement.
• One didn't get an error message if mysqld couldn't open the privilege tables.
• SET PASSWORD FOR ... closed the connection in case of errors (bug from 4.0.3).
• Increased max possible max_allowed_packet in mysqld to 1 GB.
• Fixed bug when doing a multi-line INSERT on a table with an AUTO_INCREMENT key which was not in the first part of the key.
• Changed LOAD DATA INFILE to not recreate index if the table had rows from before.
• Fixed overrun bug when calling AES_DECRYPT() with incorrect arguments.
• --skip-ssl can now be used to disable SSL in the MySQL clients, even if one is using other SSL options in an option file or previously on the command line.
• Fixed bug in MATCH ... AGAINST( ... IN BOOLEAN MODE) used with ORDER BY.
• Added LOCK TABLES and CREATE TEMPORARY TABLES privilege on the database level. One must run the mysql_fix_privilege_tables script on old installations to activate these.
• In SHOW TABLE ... STATUS, compressed tables sometimes showed up as dynamic.
• SELECT @@[global|session].var_name didn't report global | session in the result column name.
• Fixed problem in replication that FLUSH LOGS in a circular replication setup created an infinite number of binary log files. Now a rotate-binary-log command in the binary log will not cause slaves to rotate logs.
• Removed STOP EVENT from binary log when doing FLUSH LOGS.
• Disable the use of SHOW NEW MASTER FOR SLAVE as this needs to be completely reworked in a future release.
• Fixed a bug with constant expression (for example, field of a one-row table, or field from a table, referenced by a UNIQUE key) appeared in ORDER BY part of SELECT DISTINCT.
• --log-binary=a.b.c now properly strips off .b.c.
• FLUSH LOGS removed numerical extension for all future update logs.
• GRANT ... REQUIRE didn't store the SSL information in the mysql.user table if SSL was not enabled in the server.
• GRANT ... REQUIRE NONE can now be used to remove SSL information.
• AND is now optional between REQUIRE options.
• REQUIRE option was not properly saved, which could cause strange output in SHOW GRANTS.
• Fixed that mysqld --help reports correct values for --datadir and --bind-address.
• Fixed that one can drop UDFs that didn't exist when mysqld was started.
• Fixed core dump problem with SHOW VARIABLES on some 64 bit systems (like Solaris sparc).
• Fixed a bug in my_getopt(); --set-variable syntax didn't work for those options that didn't have a valid variable in the my_option struct. This affected at least the default-table-type option.
• Fixed a bug from 4.0.2 that caused REPAIR TABLE and myisamchk --recover to fail on tables with duplicates in a unique key.
• Fixed a bug from 4.0.3 in calculating the default datatype for some functions. This affected queries of type CREATE TABLE table_name SELECT expression(),...
• Fixed bug in queries of type SELECT * FROM table-list GROUP BY ... and SELECT DISTINCT * FROM ....
• Fixed bug with the --slow-log when logging an administrator command (like FLUSH TABLES).
• Fixed a bug that OPTIMIZE of locked and modified table, reported table corruption.
• Fixed a bug in my_getopt() in handling of special prefixes (--skip-, --enable-). --skip-external-locking didn't work and the bug may have affected other similar options.
• Fixed bug in checking for output file name of the tee option.
• Added some more optimisation to use index for SELECT ... FROM many_tables .. ORDER BY key limit #
• Fixed problem in SHOW OPEN TABLES when a user didn't have access permissions to one of the opened tables.

D.3.14 Changes in release 4.0.3 (26 Aug 2002: Beta)

• Fixed problem with types of user variables. (Bug #551)
• Fixed problem with configure ... --localstatedir=....
• Cleaned up mysql.server script.
• Fixed a bug in mysqladmin shutdown when pid file was modified while mysqladmin was still waiting for the previous one to disappear. This could happen during a very quick restart and caused mysqladmin to hang until shutdown_timeout seconds had passed.
• Don't increment warnings when setting AUTO_INCREMENT columns to NULL in LOAD DATA INFILE.
• Fixed all boolean type variables/options to work with the old syntax, for example, all of these work: --lower-case-table-names, --lower-case-table-names=1, -O lower-case-table-names=1, --set-variable=lower-case-table-names=1
• Fixed shutdown problem (SIGTERM signal handling) on Solaris. (Bug from 4.0.2).
• SHOW MASTER STATUS now returns an empty set if binary log is not enabled.
• SHOW SLAVE STATUS now returns an empty set if slave is not initialised.
• Don't update MyISAM index file on update if not strictly necessary.
• Fixed bug in SELECT DISTINCT ... FROM many_tables ORDER BY not-used-column.
• Fixed a bug with BIGINT values and quoted strings.
• Added QUOTE() function that performs SQL quoting to produce values that can be used as data values in queries.
• Changed variable DELAY_KEY_WRITE to an enum to allow one set DELAY_KEY_WRITE for all tables without taking down the server.
• Changed behaviour of IF(condition,column,NULL) so that it returns the value of the column type.
• Made safe_mysqld a symlink to mysqld_safe in binary distribution.
• Fixed security bug when having an empty database name in the user.db table.
• Fixed some problems with CREATE TABLE ... SELECT function().
• mysqld now has the option --temp-pool enabled by default as this gives better performance with some operating systems.
• Fixed problem with too many allocated alarms on slave when connecting to master many times (normally not a very critical error).
• Fixed hang in CHANGE MASTER TO if the slave thread died very quickly.
• Big cleanup in replication code (less logging, better error messages, etc..)
• If the --code-file option is specified, the server calls setrlimit() to set the maximum allowed core file size to unlimited, so core files can be generated.
• Fixed bug in query cache after temporary table creation.
• Added --count=N (-c) option to mysqladmin, to make the program do only N iterations. To be used with --sleep (-i). Useful in scripts.
• Fixed bug in multi-table UPDATE: when updating a table, do_select() became confused about reading records from a cache.
• Fixed bug in multi-table UPDATE when several fields were referenced from a single table
• Fixed bug in truncating nonexisting table.
• Fixed bug in REVOKE that caused user resources to be randomly set.
• Fixed bug in GRANT for the new CREATE TEMPORARY TABLE privilege.
• Fixed bug in multi-table DELETE when tables are re-ordered in the table initialisation method and ref_lengths are of different sizes.
• Fixed two bugs in SELECT DISTINCT with large tables.
• Fixed bug in query cache initialisation with very small query cache size.
• Allow DEFAULT with INSERT statement.
• The startup parameters myisam_max_sort_file_size and myisam_max_extra_sort_file_size are now given in bytes, not megabytes.
• External system locking of MyISAM/ISAM files is now turned off by default. One can turn this on with --external-locking. (For most users this is never needed).
• Fixed core dump bug with INSERT ... SET db_name.table_name.colname=''.
• Fixed client hangup bug when using some SQL commands with wrong syntax.
• Fixed a timing bug in DROP DATABASE
• New SET [GLOBAL | SESSION] syntax to change thread-specific and global server variables at runtime.
• Added variable slave_compressed_protocol.
• Renamed variable query_cache_startup_type to query_cache_type, myisam_bulk_insert_tree_size to bulk_insert_buffer_size, record_buffer to read_buffer_size and record_rnd_buffer to read_rnd_buffer_size.
• Renamed some SQL variables, but old names will still work until 5.0. See section Upgrading From Version 3.23 to 4.0.
• Renamed --skip-locking to --skip-external-locking.
• Removed unused variable query_buffer_size.
• Fixed a bug that made the pager option in the mysql client non-functional.
• Added full AUTO_INCREMENT support to MERGE tables.
• Extended LOG() function to accept an optional arbitrary base parameter. See section Mathematical Functions.
• Added LOG2() function (useful for finding out how many bits a number would require for storage).
• Added LN() natural logarithm function for compatibility with other databases. It is synonymous with LOG(X).

D.3.15 Changes in release 4.0.2 (01 Jul 2002)

• Cleaned up NULL handling for default values in DESCRIBE table_name.
• Fixed truncate() to round up negative values to the nearest integer.
• Changed --chroot=path option to execute chroot() immediately after all options have been parsed.
• Don't allow database names that contain `\'.
• lower_case_table_names now also affects database names.
• Added XOR operator (logical and bitwise XOR) with ^ as a synonym for bitwise XOR.
• Added function IS_FREE_LOCK("lock_name"). Based on code contributed by Hartmut Holzgraefe hartmut@six.de.
• Removed mysql_ssl_clear() from C API, as it was not needed.
• DECIMAL and NUMERIC types can now read exponential numbers.
• Added SHA1() function to calculate 160 bit hash value as described in RFC 3174 (Secure Hash Algorithm). This function can be considered a cryptographically more secure equivalent of MD5(). See section Miscellaneous Functions.
• Added AES_ENCRYPT() and AES_DECRYPT() functions to perform encryption according to AES standard (Rijndael). See section Miscellaneous Functions.
• Added --single-transaction option to mysqldump, allowing a consistent dump of InnoDB tables. See section mysqldump, Dumping Table Structure and Data.
• Fixed bug in innodb_log_group_home_dir in SHOW VARIABLES.
• Fixed a bug in optimiser with merge tables when non-unique values are used in summing up (causing crashes).
• Fixed a bug in optimiser when a range specified makes index grouping impossible (causing crashes).
• Fixed a rare bug when FULLTEXT index is present and no tables are used.
• Added privileges CREATE TEMPORARY TABLES, EXECUTE, LOCK TABLES, REPLICATION CLIENT, REPLICATION SLAVE, SHOW DATABASES and SUPER. To use these, you must have run the mysql_fix_privilege_tables script after upgrading.
• Fixed query cache align data bug.
• Fixed mutex bug in replication when reading from master fails.
• Added missing mutex in TRUNCATE TABLE; This fixes some core dump/hangup problems when using TRUNCATE TABLE.
• Fixed bug in multi-table DELETE when optimiser uses only indices.
• Fixed that ALTER TABLE table_name RENAME new_table_name is as fast as RENAME TABLE.
• Fixed bug in GROUP BY with two or more fields, where at least one field can contain NULL values.
• Use Turbo Boyer-Moore algorithm to speed up LIKE "%keyword%" searches.
• Fixed bug in DROP DATABASE with symlink.
• Fixed crash in REPAIR ... USE_FRM.
• Fixed bug in EXPLAIN with LIMIT offset != 0.
• Fixed bug in phrase operator "..." in boolean full-text search.
• Fixed bug that caused duplicated rows when using truncation operator * in boolean full-text search.
• Fixed bug in truncation operator of boolean full-text search (wrong results when there are only +word*s in the query).
• Fixed bug in boolean full-text search that caused a crash when an identical MATCH expression that did not use an index appeared twice.
• Query cache is now automatically disabled in mysqldump.
• Fixed problem on Windows 98 that made sending of results very slow.
• Boolean full-text search weighting scheme changed to something more reasonable.
• Fixed bug in boolean full-text search that caused MySQL to ignore queries of ft_min_word_len characters.
• Boolean full-text search now supports "phrase searches".
• New configure option --without-query-cache.
• Memory allocation strategy for "root memory" changed. Block size now grows with number of allocated blocks.
• INET_NTOA() now returns NULL if you give it an argument that is too large (greater than the value corresponding to 255.255.255.255).
• Fix SQL_CALC_FOUND_ROWS to work with UNIONs. It will work only if the first SELECT has this option and if there is global LIMIT for the entire statement. For the moment, this requires using parentheses for individual SELECT queries within the statement.
• Fixed bug in SQL_CALC_FOUND_ROWS and LIMIT.
• Don't give an error for CREATE TABLE ...(... VARCHAR(0)).
• Fixed SIGINT and SIGQUIT problems in `mysql.cc' on Linux with some glibc versions.
• Fixed bug in `convert.cc', which is caused by having an incorrect net_store_length() linked in the CONVERT::store() method.
• DOUBLE and FLOAT columns now honor the UNSIGNED flag on storage.
• InnoDB now retains foreign key constraints through ALTER TABLE and CREATE/DROP INDEX.
• InnoDB now allows foreign key constraints to be added through the ALTER TABLE syntax.
• InnoDB tables can now be set to automatically grow in size (autoextend).
• Added --ignore-lines=n option to mysqlimport. This has the same effect as the IGNORE n LINES clause for LOAD DATA.
• Fixed bug in UNION with last offset being transposed to total result set.
• REPAIR ... USE_FRM added.
• Fixed that DEFAULT_SELECT_LIMIT is always imposed on UNION result set.
• Fixed that some SELECT options can appear only in the first SELECT.
• Fixed bug with LIMIT with UNION, where last select is in the braces.
• Fixed that full-text works fine with UNION operations.
• Fixed bug with indexless boolean full-text search.
• Fixed bug that sometimes appeared when full-text search was used with "const" tables.
• Fixed incorrect error value when doing a SELECT with an empty HEAP table.
• Use ORDER BY column DESC now sorts NULL values first. (In other words, NULL values sort first in all cases, whether or not DESC is specified.) This is changed back in 4.0.10.
• Fixed bug in WHERE key_name='constant' ORDER BY key_name DESC.
• Fixed bug in SELECT DISTINCT ... ORDER BY DESC optimisation.
• Fixed bug in ... HAVING 'GROUP_FUNCTION'(xxx) IS [NOT] NULL.
• Fixed bug in truncation operator for boolean full-text search.
• Allow value of --user=# option for mysqld to be specified as a numeric user ID.
• Fixed a bug where SQL_CALC_ROWS returned an incorrect value when used with one table and ORDER BY and with InnoDB tables.
• Fixed that SELECT 0 LIMIT 0 doesn't hang thread.
• Fixed some problems with USE/IGNORE INDEX when using many keys with the same start column.
• Don't use table scan with BerkeleyDB and InnoDB tables when we can use an index that covers the whole row.
• Optimised InnoDB sort-buffer handling to take less memory.
• Fixed bug in multi-table DELETE and InnoDB tables.
• Fixed problem with TRUNCATE and InnoDB tables that produced the error Can't execute the given command because you have active locked tables or an active transaction.
• Added NO_UNSIGNED_SUBTRACTION to the set of flags that may be specified with the --sql-mode option for mysqld. It disables unsigned arithmetic rules when it comes to subtraction. (This will make MySQL 4.0 behave more like 3.23 with UNSIGNED columns).
• The result returned for all bit functions (|, <<, ...) is now of type unsigned integer.
• Added detection of nan values in MyISAM to make it possible to repair tables with nan in float or double columns.
• Fixed new bug in myisamchk where it didn't correctly update number of "parts" in the MyISAM index file.
• Changed to use autoconf 2.52 (from autoconf 2.13).
• Fixed optimisation problem where the MySQL Server was in "preparing" state for a long time when selecting from an empty table which had contained a lot of rows.
• Fixed bug in complicated join with const tables. This fix also improves performance a bit when referring to another table from a const table.
• First pre-version of multi-table UPDATE statement.
• Fixed bug in multi-table DELETE.
• Fixed bug in SELECT CONCAT(argument_list) ... GROUP BY 1.
• INSERT ... SELECT did a full rollback in case of an error. Fixed so that we only roll back the last statement in the current transaction.
• Fixed bug with empty expression for boolean full-text search.
• Fixed core dump bug in updating full-text key from/to NULL.
• ODBC compatibility: Added BIT_LENGTH() function.
• Fixed core dump bug in GROUP BY BINARY column.
• Added support for NULL keys in HEAP tables.
• Use index for ORDER BY in queries of type: SELECT * FROM t WHERE key_part1=1 ORDER BY key_part1 DESC,key_part2 DESC
• Fixed bug in FLUSH QUERY CACHE.
• Added CAST() and CONVERT() functions. The CAST and CONVERT functions are nearly identical and mainly useful when you want to create a column with a specific type in a CREATE ... SELECT statement. For more information, read Cast Functions.
• CREATE ... SELECT on DATE and TIME functions now create columns of the expected type.
• Changed order in which keys are created in tables.
• Added new columns Null and Index_type to SHOW INDEX output.
• Added --no-beep and --prompt options to mysql command-line client.
• New feature: management of user resources.

  GRANT ... WITH MAX_QUERIES_PER_HOUR N1 MAX_UPDATES_PER_HOUR N2 MAX_CONNECTIONS_PER_HOUR N3;

  See section Limiting user resources.

• Added mysql_secure_installation to the `scripts/' directory.

D.3.16 Changes in release 4.0.1 (23 Dec 2001)

• Added system command to mysql.
• Fixed bug when HANDLER was used with some unsupported table type.
• mysqldump now puts ALTER TABLE tbl_name DISABLE KEYS and ALTER TABLE tbl_name ENABLE KEYS in the sql dump.
• Added mysql_fix_extensions script.
• Fixed stack overrun problem with LOAD DATA FROM MASTER on OSF/1.
• Fixed shutdown problem on HP-UX.
• Added DES_ENCRYPT() and DES_DECRYPT() functions.
• Added FLUSH DES_KEY_FILE statement.
• Added --des-key-file option to mysqld.
• HEX(string) now returns the characters in string converted to hexadecimal.
• Fixed problem with GRANT when using lower_case_table_names=1.
• Changed SELECT ... IN SHARE MODE to SELECT ... LOCK IN SHARE MODE (as in MySQL 3.23).
• A new query cache to cache results from identical SELECT queries.
• Fixed core dump bug on 64-bit machines when it got an incorrect communication packet.
• MATCH ... AGAINST(... IN BOOLEAN MODE) can now work without FULLTEXT index.
• Fixed slave to replicate from 3.23 master.
• Miscellaneous replication fixes/cleanup.
• Got shutdown to work on Mac OS X.
• Added myisam/ft_dump utility for low-level inspection of FULLTEXT indexes.
• Fixed bug in DELETE ... WHERE ... MATCH ....
• Added support for MATCH ... AGAINST(... IN BOOLEAN MODE). Note: you must rebuild your tables with ALTER TABLE tablename TYPE=MyISAM to be able to use boolean full-text search.
• LOCATE() and INSTR() are now case-sensitive if either argument is a binary string.
• Changed RAND() initialisation so that RAND(N) and RAND(N+1) are more distinct.
• Fixed core dump bug in UPDATE ... ORDER BY.
• In 3.23, INSERT INTO ... SELECT always had IGNORE enabled. Now MySQL will stop (and possibly roll back) by default in case of an error unless you specify IGNORE.
• Ignore DATA DIRECTORY and INDEX DIRECTORY directives on Windows.
• Added boolean full-text search code. It should be considered early alpha.
• Extended MODIFY and CHANGE in ALTER TABLE to accept the FIRST and AFTER keywords.
• Indexes are now used with ORDER BY on a whole InnoDB table.

D.3.17 Changes in release 4.0.0 (Oct 2001: Alpha)

• Added --xml option to mysql for producing XML output.
• Added full-text variables ft_min_word_len, ft_max_word_len, and ft_max_word_len_for_sort.
• Added documentation for libmysqld, the embedded MySQL server library. Also added example programs (a mysql client and mysqltest test program) which use libmysqld.
• Removed all Gemini hooks from MySQL server.
• Removed my_thread_init() and my_thread_end() from `mysql_com.h', and added mysql_thread_init() and mysql_thread_end() to `mysql.h'.
• Support for communication packets > 16M. In 4.0.1 we will extend MyISAM to be able to handle these.
• Secure connections (with SSL).
• Unsigned BIGINT constants now work. MIN() and MAX() now handle signed and unsigned BIGINT numbers correctly.
• New character set latin1_de which provides correct German sorting.
• STRCMP() now uses the current character set when doing comparisons, which means that the default comparison behaviour now is case-insensitive.
• TRUNCATE TABLE and DELETE FROM tbl_name are now separate functions. One bonus is that DELETE FROM tbl_name now returns the number of deleted rows, rather than zero.
• DROP DATABASE now executes a DROP TABLE on all tables in the database, which fixes a problem with InnoDB tables.
• Added support for UNION.
• Added support for multi-table DELETE operations.
• A new HANDLER interface to MyISAM tables.
• Added support for INSERT on MERGE tables. Patch from Benjamin Pflugmann.
• Changed WEEK(date,0) to match the calendar in the USA.
• COUNT(DISTINCT) is about 30% faster.
• Speed up all internal list handling.
• Speed up IS NULL, ISNULL() and some other internal primitives.
• Full-text index creation now is much faster.
• Tree-like cache to speed up bulk inserts and myisam_bulk_insert_tree_size variable.
• Searching on packed (CHAR/VARCHAR) keys is now much faster.
• Optimised queries of type: SELECT DISTINCT * from tbl_name ORDER by key_part1 LIMIT row_count.
• SHOW CREATE TABLE now shows all table attributes.
• ORDER BY ... DESC can now use keys.
• LOAD DATA FROM MASTER "automatically" sets up a slave.
• Renamed safe_mysqld to mysqld_safe to make this name more in line with other MySQL scripts/commands.
• Added support for symbolic links to MyISAM tables. Symlink handling is now enabled by default for Windows.
• Added SQL_CALC_FOUND_ROWS and FOUND_ROWS(). This makes it possible to know how many rows a query would have returned without a LIMIT clause.
• Changed output format of SHOW OPEN TABLES.
• Allow SELECT expression LIMIT ....
• Added ORDER BY syntax to UPDATE and DELETE.
• SHOW INDEXES is now a synonym for SHOW INDEX.
• Added ALTER TABLE tbl_name DISABLE KEYS and ALTER TABLE tbl_name ENABLE KEYS commands.
• Allow use of IN as a synonym for FROM in SHOW commands.
• Implemented "repair by sort" for FULLTEXT indexes. REPAIR TABLE, ALTER TABLE, and OPTIMIZE TABLE for tables with FULLTEXT indexes are now up to 100 times faster.
• Allow SQL-99 syntax X'hexadecimal-number'.
• Cleaned up global lock handling for FLUSH TABLES WITH READ LOCK.
• Fixed problem with DATETIME = constant in WHERE optimisation.
• Added --master-data and --no-autocommit options to mysqldump. (Thanks to Brian Aker for this.)
• Added script mysql_explain_log.sh to distribution. (Thanks to mobile.de).

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Generated: 2007-01-26 17:58:44