Incompatible Change: The InnoDB storage engine no longer ignores trailing spaces when comparing BINARY or VARBINARY column values. This means that (for example) the binary values 'a' and 'a ' are now regarded as unequal any time they are compared, as they are in MyISAM tables.

See Section 10.4.2, “The BINARY and VARBINARY Types” for more information about the BINARY and VARBINARY types. (Bug#14189)

MySQL Cluster: More descriptive warnings are now issued when inappropriate logging parameters are set in config.ini. (Formerly, the warning issued was simply Could not add logfile destination.) (Bug#11331)

MySQL Cluster: The ndb_mgm client commands node_id START and node_id STOP now work with management nodes as well as data nodes. However, using ALL for node_id continues to affect all data nodes only.

mysql no longer terminates data value display when it encounters a NUL byte. Instead, it displays NUL bytes as spaces. (Bug#16859)

New charset command added to mysql command-line client. By typing charset name or \C name (such as \C UTF8), the client character set can be changed without reconnecting. (Bug#16217)

Added the --wait-timeout option to mysqlmanager to allow configuration of the timeout for dropping an inactive connection, and increased the default timeout from 30 seconds to 28,800 seconds (8 hours). (Bug#15980, Bug#12674)

The INFORMATION_SCHEMA now skips data contained in unlistable/unreadable directories rather than returning an error. (Bug#15851)

InnoDB now caches a list of unflushed files instead of scanning for unflushed files during a table flush operation. This improves performance when --innodb_file_per_table is set on a system with a large number of InnoDB tables. (Bug#15653)

Added the --port-open-timeout option to mysqld to control how many seconds the server should wait for the TCP/IP port to become free if it cannot be opened. (Bug#15591)

Wording of error 1329 changed to No data - zero rows fetched, selected, or processed. (Bug#15206)

The message for error 1109 changed from Unknown table ... in order clause to Unknown table ... in field list. (Bug#15091)

A number of performance issues were resolved that had previously been encountered when using statements that repeatedly invoked stored functions. For example, calling BENCHMARK() using a stored function executed much more slowly than when invoking it with inline code that accomplished the same task. In most cases the two should now execute with approximately the same speed. (Bug#14946, Bug#15014)

mysqldump now surrounds the DEFINER, SQL SECURITY DEFINER and WITH CHECK OPTION clauses of a CREATE VIEW statement with "not in version" comments to prevent errors in earlier versions of MySQL. (Bug#14871)

When using the GROUP_CONCAT() function where the group_concat_max_len system variable was greater than 512, the type of the result was BLOB only if the query included an ORDER BY clause; otherwise the result was a VARCHAR.

The result type of the GROUP_CONCAT() function is now VARCHAR only if the value of the group_concat_max_len system variable is less than or equal to 512. Otherwise, this function returns a BLOB. (Bug#14169)

The mysql_ping() function will now retry if the reconnect flag is set and error CR_SERVER_LOST is encountered during the first attempt to ping the server. (Bug#14057)

The mysqltest utility now converts all CR/LF combinations to LF to allow test cases intended for Windows to work properly on UNIX-like systems. (Bug#13809)

libmysqlclient now uses versioned symbols with GNU ld. (Bug#3074)

The client API now attempts to reconnect using TCP/IP if the reconnect flag is set, as is the case with sockets. (Bug#2845)

Two new Hungarian collations are included: utf8_hungarian_ci and ucs2_hungarian_ci. These support the correct sort order for Hungarian vowels. However, they do not support the correct order for sorting Hungarian consonant contractions; we expect to fix this issue in a future release.

Several changes were made to make upgrades easier:

MySQL Cluster: Cluster log file paths were truncated to 128 characters. They may now be as long as MAX_PATH (the maximum path length permitted by the operating system). (Bug#17411)

MySQL Cluster: Following multiple forced shutdowns and restarts of data nodes, DROP DATABASE could fail. (Bug#17325)

MySQL Cluster: The REDO log would become corrupted (and thus unreadable) in some circumstances, due to a failure in the query handler. (Bug#17295)

MySQL Cluster: An UPDATE with an inner join failed to match any records if both tables in the join did not have a primary key. (Bug#17257)

MySQL Cluster: A DELETE with a join in the WHERE clause failed to retrieve any records if both tables in the join did not have a primary key. (Bug#17249)

MySQL Cluster: The error message returned by perror --ndb was prefixed with OS error code instead of NDB error code. (Bug#17235)

MySQL Cluster: In some cases, LOAD DATA INFILE did not load all data into NDB tables. (Bug#17081)

MySQL Cluster: ndb_delete_all ran out of memory when processing tables containing BLOB columns. (Bug#16693)

MySQL Cluster: A BIT column whose offset and length totaled 32 caused the cluster to crash. (Bug#16125)

MySQL Cluster: UNIQUE keys in Cluster tables were limited to 225 bytes in length. (Bug#15918)

MySQL Cluster: The ndb_autodiscover test failed sporadically due to a node not being permitted to connect to the cluster. (Bug#15619)

MySQL Cluster: NDB returned an incorrect Can't find file error for OS error 24; this has been changed to Too many open files. (Bug#15020)

MySQL Cluster: No error message was generated for setting NoOfFragmentLogFiles too low. (Bug#13966)

MySQL Cluster: No error message was generated for setting MaxNoOfAttributes too low. (Bug#13965)

MySQL Cluster: When running more than one management process in a cluster:

(Bug#12045, Bug#12124)

MySQL Cluster: ndb_mgm -c host:port -e "node_id STOP" would stop a management process running only on the same system on which the command was issued.

MySQL Cluster: ndb_mgm -e "SHUTDOWN" failed to shut down any management processes at all.

Replication: For a transaction that used MyISAM and InnoDB tables, interruption of the transaction due to a dropped connection on a master server caused slaves to lose synchrony. (Bug#16559)

Replication: The --replicate-do and --replicate-ignore options were not being enforced on multiple-table statements. (Bug#16487, Bug#15699)

Replication: Previously, a stored function invocation was written to the binary log as DO func_name() if the invocation changes data and occurs within a nonlogged statement, or if the function invokes a stored procedure that produces an error. These invocations now are logged as SELECT func_name() instead for better control over error code checking (slave servers could stop due to detecting a different error than occurred on the master). (Bug#14769)

Replication: BIT fields were not properly handled when using row-based replication. (Bug#13418)

Cluster API: Upon the completion of a scan where a key request remained outstanding on the primary replica and a starting node died, the scan did not terminate. This caused incomplete error handling for the failed node. (Bug#15908)

type_decimal failed with the prepared statement protocol. (Bug#17826)

The MySQL server could crash with out of memory errors when performing aggregate functions on a DECIMAL column. (Bug#17602)

Using DROP FUNCTION IF EXISTS func_name to drop a user-defined function caused a server crash if the server was running with the --skip-grant-tables option. (Bug#17595)

Data truncations on non-UNIQUE indexes could crash InnoDB when using multi-byte character sets. (Bug#17530)

A natural join between INFORMATION_SCHEMA tables failed. (Bug#17523)

A stored procedure failed to return data the first time it was called per connection. (Bug#17476)

For certain MERGE tables, the optimizer wrongly assumed that using index_merge/intersection was too expensive. (Bug#17314)

The parser allowed CREATE AGGREGATE FUNCTION for creating stored functions, even though AGGREGATE does not apply. (It is used only for CREATE FUNCTION only when creating user-defined functions.) (Bug#16896)

Cursors in stored routines could cause a server crash. (Bug#16887)

Triggers created without BEGIN and END clauses resulted in “You have an error in your SQL syntax” errors when dumping and replaying a binary log. (Bug#16878)

Using ALTER TABLE to increase the length of a BINARY(M) column caused column values to be padded with spaces rather than 0x00 bytes. (Bug#16857)

A RETURN statement within a trigger caused a server crash. RETURN now is disallowed within triggers. To exit immediately, use LEAVE. (Bug#16829)

For a MySQL 5.0 server, using MySQL 4.1 tables in queries with a GROUP BY clause could result in buffer overrun or a server crash. (Bug#16752)

An INSERT statement in a stored procedure corrupted the binary log. (Bug#16621)

If the query optimizer transformed a GROUP BY clause in a subquery, it did not also transform the HAVING clause if there was one, producing incorrect results. (Bug#16603)

In a highly concurrent environment, a server crash or deadlock could result from execution of a statement that used stored functions or activated triggers coincident with alteration of the tables used by these functions or triggers. (Bug#16593)

A race condition could occur when dropping the adaptive hash index for a B-tree page in InnoDB. (Bug#16582)

When evaluation of the test in a CASE failed in a stored procedure that contained a CONTINUE handler, execution resumed at the beginning of the CASE statement instead of at the end. (Bug#16568)

Clients compiled from source with the --without-readline did not save command history from session to session. (Bug#16557)

The DECIMAL data type was not being handled correctly with prepared statements. (Bug#16511)

Instance Manager searched wrong location for password file on some platforms. (Bug#16499)

UPDATE statement crashed multi-byte character set FULLTEXT index if update value was almost identical to initial value only differing in some spaces being changed to  . (Bug#16489)

Certain nested LEFT JOIN operations were not properly optimized. (Bug#16393)

Dropping InnoDB constraints named tbl_name_ibfk_0 could crash the server. (Bug#16387)

SELECT with GROUP BY on a view could cause a server crash. (Bug#16382)

An invalid stored routine could not be dropped. (Bug#16303)

InnoDB: After upgrading an InnoDB table having a VARCHAR BINARY column created in MySQL 4.0 to MySQL 5.0, update operations on the table would cause the server to crash. (Bug#16298)

Parallel builds occasionally failed on Solaris. (Bug#16282)

A call to the IF() function using decimal arguments could return incorrect results. (Bug#16272)

MySQL server dropped client connection for certain SELECT statements against views defined that used MERGE algorithm. (Bug#16260)

InnoDB used full explicit table locks in trigger processing. (Bug#16229)

Using GROUP BY on column used in WHERE clause could cause empty set to be returned. (Bug#16203)

A memory leak caused warnings on slaves for certain statements that executed without warning on the master. (Bug#16175)

The FORCE INDEX keyword in a query would prevent an index merge from being used where an index merge would normally be chosen by the optimizer. (Bug#16166)

Setting InnoDB path settings to an empty string caused InnoDB storage engine to crash upon server startup. (Bug#16157)

The mysql_stmt_sqlstate() C API function incorrectly returned an empty string rather than '00000' when no error occurred. (Bug#16143)

MIN() and MAX() operations were not optimized for views. (Bug#16016)

Performing a RENAME TABLE on an InnoDB table when the server was started with the --innodb_file_per_table option and the data directory was a symlink caused a server crash. (Bug#15991)

Executing a SHOW CREATE VIEW query of an invalid view caused the mysql_next_result() function of libMySQL.dll to hang. (Bug#15943)

Test suite sp test left behind tables when the test failed that could cause future tests to fail. (Bug#15866)

STR_TO_DATE(1,NULL) caused a server crash. (Bug#15828, CVE-2006-3081)

CAST(... AS TIME) operations returned different results when using versus not using prepared-statement protocol. (Bug#15805)

Issuing a DROP USER command could cause some users to encounter a hostname is not allowed to connect to this MySQL server error. (Bug#15775)

The contents of fill_help_tables.sql could not be loaded in strict SQL mode. (Bug#15760)

fill_help_tables.sql was not included in binary distributions for several platforms. (Bug#15759)

Certain LEAVE statements in stored procedures were not properly optimized. (Bug#15737)

The mysql_real_connect() C API function incorrectly reset the MYSQL_OPT_RECONNECT option to its default value. (Bug#15719)

Created a user function with an empty string (that is, CREATE FUNCTION ''()), was accepted by the server. Following this, calling SHOW FUNCTION STATUS would cause the server to crash. (Bug#15658)

Trying to compile the server on Windows generated a stack overflow warning due to a recursive definition of the internal Field_date::store() method. (Bug#15634)

In some cases the query optimizer did not properly perform multiple joins where inner joins followed left joins, resulting in corrupted result sets. (Bug#15633)

Certain permission management statements could create a NULL host name for a user, resulting in a server crash. (Bug#15598)

Improper memory handling for stored routine variables could cause memory overruns and binary log corruption. (Bug#15588)

The COALESCE() function truncated data in a TINYTEXT column. (Bug#15581)

Binary distributions for Solaris contained files with group ownership set to the nonexisting wheel group. Now the bin group is used. (Bug#15562)

The absence of a table in the left part of a left or right join was not checked prior to name resolution, which resulted in a server crash. (Bug#15538)

A SELECT of a stored function that references the INFORMATION_SCHEMA could crash the server. (Bug#15533)

Characters in the gb2312 and euckr character sets which did not have Unicode mappings were truncated. (Bug#15377)

Certain subqueries where the inner query was the result of a aggregate function would return different results with MySQL 5.0 than with MySQL 4.1.

Subselects could also return wrong results when the query cache and grouping were involved. (Bug#15347)

Performing an ORDER BY on an indexed ENUM column returned error. (Bug#15308)

A SELECT query which contained a GROUP_CONCAT() and an ORDER BY clause against the INFORMATION_SCHEMA resulted in an empty result set. (Bug#15307)

The NOT FOUND condition handler for stored procedures did not distinguish between a NOT FOUND condition and an exception or warning. (Bug#15231)

The SELECT privilege was required for triggers that performed no selects. (Bug#15196)

An attempt to open a table that requires a disabled storage engine could cause a server crash. (Bug#15185)

The UPDATE privilege was required for triggers that performed no updates. (Bug#15166)

Tarball install package was missing a proper fill_help_tables.sql file. (Bug#15151)

Setting innodb_log_file_size to a value greater than 4G crashed the server. (Bug#15108)

When multiple handlers are created for the same MySQL error number within nested blocks, the outermost handler took precedence. (Bug#15011)

A statement containing GROUP BY and HAVING clauses could return incorrect results when the HAVING clause contained logic that returned FALSE for every row. (Bug#14927)

Stored routines that contained only a single statement were not written properly to the dumpfile when using mysqldump. (Bug#14857)

Killing a long-running query containing a subquery could cause a server crash. (Bug#14851)

GRANT statements specifying schema names that included underscore characters (that is, my_schema) did not match if the underscore was escaped in the GRANT statement (that is, GRANT ALL ON `my\_schema` ...). (Bug#14834)

Generating an AUTO_INCREMENT value through a FEDERATED table did not set the value returned by LAST_INSERT_ID(). (Bug#14768)

SUBSTRING_INDEX() could yield inconsistent results when applied with the same arguments to consecutive rows in a query. (Bug#14676)

Running out of diskspace in the location specified by the tmpdir option resulted in incorrect error message. (Bug#14634)

InnoDB: Comparison of indexed VARCHAR CHARACTER SET ucs2 COLLATE ucs2_bin columns using LIKE could fail. (Bug#14583)

A stored procedure with an undefined variable and an exception handler would hang the client when called. (Bug#14498)

A FULLTEXT query in a prepared statement could result in unexpected behavior. (Bug#14496)

Using an aggregate function as the argument for a HAVING clause resulted in the aggregate function always returning FALSE. (Bug#14274)

The use of LOAD INDEX within a stored routine was permitted and caused the server to crash.

(Bug#14270)

A COMMIT statement followed by a ALTER TABLE statement on a BDB table caused server crash. (Bug#14212)

The mysql_stmt_store_result() C API function could not be used for a prepared statement if a cursor had been opened for the statement. (Bug#14013)

SET sql_mode = N, where N > 31, did not work properly. (Bug#13897)

Attempts to create FULLTEXT indexes on VARCHAR columns larger than 1000 bytes resulted in error. (Bug#13835)

The RENAME TABLE statement did not move triggers to the new table. (Bug#13525)

The length of a VARCHAR() column that used the utf8 character set would increase each time the table was re-created in a stored procedure or prepared statement, eventually causing the CREATE TABLE statement to fail. (Bug#13134)

Instance Manager erroneously accepted a list of instance identifiers for the START INSTANCE and STOP INSTANCE commands (should accept only a single identifier). (Bug#12813)

A prepared statement created from a SELECT ... LIKE query (such as PREPARE stmt1 FROM 'SELECT col_1 FROM tedd_test WHERE col_1 LIKE ?';) would begin to produce erratic results after being executed repeatedly numerous (thousands) of times. (Bug#12734)

Multi-byte path names for LOAD DATA and SELECT ... INTO OUTFILE caused errors. Added the character_set_filesystem system variable, which controls the interpretation of string literals that refer to file names. (Bug#12448)

Temporary table aliasing did not work inside stored functions. (Bug#12198)

The embedded server did not allow binding of columns to the MYSQL_TYPE_VAR_STRING data type in prepared statements. (Bug#12070)

When MyODBC or any other client called my_init()/my_end() several times, it caused corruption of charset data stored in once_mem_pool. (Bug#11892)

Setting the myisam_repair_threads system variable to a value larger than 1 could cause corruption of large MyISAM tables. (Bug#11527)

The mysqlbinlog utility did not output DELIMITER statements, causing syntax errors for stored routine creation statements. (Bug#11312)

The embedded server failed various tests in the automated test suite. (Bug#10801, Bug#10925, Bug#15433, Bug#9633, Bug#10926, Bug#9631, Bug#10930, Bug#10911, Bug#9630, Bug#10924)

A large BIGINT value specified in a WHERE clause could be treated differently depending on whether it is specified as a quoted string. (For example, WHERE bigint_col = 17666000000000000000 versus WHERE bigint_col = '17666000000000000000'). (Bug#9088)

CHECKSUM TABLE returned different values for MyISAM tables depending on whether the QUICK or EXTENDED option was used. (Bug#8841)

Using the TRUNCATE() function with a negative number for the second argument on a BIGINT column returned incorrect results. (Bug#8461)

Issuing GRANT EXECUTE on a procedure would display any warnings related to the creation of the procedure. (Bug#7787)

Repeated invocation of my_init() and my_end() caused corruption of character set data and connection failure. (Bug#6536)

An INSERT ... SELECT statement between tables in a MERGE set can return errors when statement involves insert into child table from merge table or vice-versa. (Bug#5390)