Incompatible Change: MySQL Cluster: The LockPagesInMainMemory configuration parameter has changed its type and possible values. For more information, see LockPagesInMainMemory .

(Bug#25686)

Incompatible Change: Previously, the DATE_FORMAT() function returned a binary string. Now it returns a string with a character set and collation given by character_set_connection and collation_connection so that it can return month and weekday names containing non-ASCII characters. (Bug#22646)

Important Change: When using a MERGE table, the definition of the table and the underlying MyISAM tables are checked each time the tables are opened for access (including any SELECT or INSERT statement). Each table is compared for column order, types, sizes, and associated indexes. If there is a difference in any one of the tables, the statement will fail.

Added the Uptime_since_flush_status status variable, which indicates the number of seconds since the most recent FLUSH STATUS statement. (Community contribution by Jeremy Cole) (Bug#24822)

Added the SHOW PROFILES and SHOW PROFILE statements to display statement profile data, and the accompanying INFORMATION_SCHEMA.PROFILING table. Profiling is controlled via the profiling and profiling_history_size session variables. see Section 12.4.5.29, “SHOW PROFILES Syntax”, and Section 19.17, “The INFORMATION_SCHEMA PROFILING Table”. (Community contribution by Jeremy Cole)

The profiling feature is enabled via the --enable-community-features and --enable-profiling options to configure. These options are enabled by default; to disable them, use --disable-community-features and --disable-profiling. (Bug#24795)

The localhost anonymous user account created during MySQL installation on Windows now has no global privileges. Formerly this account had all global privileges. For operations that require global privileges, the root account can be used instead. (Bug#24496)

The --skip-thread-priority option now is enabled by default for binary Mac OS X distributions. Use of thread priorities degrades performance on Mac OS X. (Bug#18526)

This is the last version for which MySQL-Max RPM distributions are available. (This change was already made for non-RPM binary distributions in 5.0.27.)

The bundled yaSSL library was upgraded to version 1.5.8.

Added the --disable-grant-options option to configure. If configure is run with this option, the --bootstrap, --skip-grant-tables, and --init-file options for mysqld are disabled and cannot be used. For Windows, the configure.js script recognizes the DISABLE_GRANT_OPTIONS flag, which has the same effect.

Security Fix: Using an INFORMATION_SCHEMA table with ORDER BY in a subquery could cause a server crash.

We would like to thank Oren Isacson of Flowgate Security Consulting and Stefan Streichsbier of SEC Consult for informing us of this problem. (Bug#24630, Bug#26556, CVE-2007-1420)

Incompatible Change: For ENUM columns that had enumeration values containing commas, the commas were mapped to 0xff internally. However, this rendered the commas indistinguishable from true 0xff characters in the values. This no longer occurs. However, the fix requires that you dump and reload any tables that have ENUM columns containing any true 0xff values. Dump the tables using mysqldump with the current server before upgrading from a version of MySQL 5.0 older than 5.0.36 to version 5.0.36 or newer. (Bug#24660)

Partitioning: MySQL Cluster: A query with an IN clause against an NDB table employing explicit user-defined partitioning did not always return all matching rows. (Bug#25821)

MySQL Cluster: It was not possible to create an NDB table with a key on two VARCHAR columns where both columns had a storage length in excess of 256. (Bug#25746)

MySQL Cluster: Hosts in clusters with large numbers of nodes could experience excessive CPU usage while obtaining configuration data. (Bug#25711)

MySQL Cluster: In some circumstances, shutting down the cluster could cause connected mysqld processes to crash. (Bug#25668)

MySQL Cluster: Memory allocations for TEXT columns were calculated incorrectly, resulting in space being wasted and other issues. (Bug#25562)

MySQL Cluster: The failure of a master node during a node restart could lead to a resource leak, causing later node failures. (Bug#25554)

MySQL Cluster: An UPDATE using an IN clause on an NDB table on which there was a trigger caused mysqld to crash. (Bug#25522)

MySQL Cluster: A node shutdown occurred if the master failed during a commit. (Bug#25364)

MySQL Cluster: Creating a nonunique index with the USING HASH clause silently created an ordered index instead of issuing a warning. (Bug#24820)

MySQL Cluster: The ndb_size.tmpl file (necessary for using the ndb_size.pl script) was missing from binary distributions. (Bug#24191)

MySQL Cluster: When a data node was shut down using the management client STOP command, a connection event (NDB_LE_Connected) was logged instead of a disconnection event (NDB_LE_Disconnected). (Bug#22773)

MySQL Cluster: The management server did not handle logging of node shutdown events correctly in certain cases. (Bug#22013)

MySQL Cluster: SELECT statements with a BLOB or TEXT column in the selected column list and a WHERE condition including a primary key lookup on a VARCHAR primary key produced empty result sets. (Bug#19956)

Replication: When SET PASSWORD was written to the binary log double quotes were included in the statement. If the slave was running in with the server SQL mode set to ANSI_QUOTES, then the event failed, which halted the replication process. (Bug#24158)

Replication: A stored procedure, executed from a connection using a binary character set, and which wrote multibyte data, would write incorrectly escaped entries to the binary log. This caused syntax errors, and caused replication to fail. (Bug#23619, Bug#24492)

Replication: Changes to the lc_time_names system variable were not replicated. (Bug#22645)

Replication: For SET, SELECT, and DO statements that invoked a stored function from a database other than the default database, the function invocation could fail to be replicated. (Bug#19725)

Replication: If a slave server closed its relay log (for example, due to an error during log rotation), the I/O thread did not recognize this and still tried to write to the log, causing a server crash. (Bug#10798)

Cluster API: Deletion of an Ndb_cluster_connection object took a very long time. (Bug#25487)

Cluster API: Invoking the NdbTransaction::execute() method using execution type Commit and abort option AO_IgnoreError could lead to a crash of the transaction coordinator (DBTC). (Bug#25090)

Cluster API: A unique index lookup on a nonexistent tuple could lead to a data node timeout (error 4012). (Bug#25059)

Cluster API: libndbclient.so was not versioned. (Bug#13522)

Using ORDER BY or GROUP BY could yield different results when selecting from a view and selecting from the underlying table. (Bug#26209)

DISTINCT queries that were executed using a loose scan for an InnoDB table that had been emptied caused a server crash. (Bug#26159)

A WHERE clause that used BETWEEN for DATETIME values could be treated differently for a SELECT and a view defined as that SELECT. (Bug#26124)

Collation for LEFT JOIN comparisons could be evaluated incorrectly, leading to improper query results. (Bug#26017)

The WITH CHECK OPTION clause for views was ignored for updates of multiple-table views when the updates could not be performed on fly and the rows to update had to be put into temporary tables first. (Bug#25931)

LOAD DATA INFILE did not work with pipes. (Bug#25807)

The SEC_TO_TIME() and QUARTER() functions sometimes did not handle NULL values correctly. (Bug#25643)

The InnoDB parser sometimes did not account for null bytes, causing spurious failure of some queries. (Bug#25596)

View definitions that used the ! operator were treated as containing the NOT operator, which has a different precedence and can produce different results. . (Bug#25580)

An error in the name resolution of nested JOIN ... USING constructs was corrected. (Bug#25575)

GROUP BY and DISTINCT did not group NULL values for columns that have a UNIQUE index. . (Bug#25551)

The --with-readline option for configure did not work for commercial source packages, but no error message was printed to that effect. Now a message is printed. (Bug#25530)

mysql_stmt_fetch() did an invalid memory deallocation when used with the embedded server. (Bug#25492)

Referencing an ambiguous column alias in an expression in the ORDER BY clause of a query caused the server to crash. (Bug#25427)

A yaSSL program named test was installed, causing conflicts with the test system utility. It is no longer installed. (Bug#25417)

For a UNIQUE index containing many NULL values, the optimizer would prefer the index for col IS NULL conditions over other more selective indexes. . (Bug#25407)

An AFTER UPDATE trigger on an InnoDB table with a composite primary key caused the server to crash. (Bug#25398)

Passing a NULL value to a user-defined function from within a stored procedure crashes the server. (Bug#25382)

perror crashed on some platforms due to failure to handle a NULL pointer. (Bug#25344)

mysql.server stop timed out too quickly (35 seconds) waiting for the server to exit. Now it waits up to 15 minutes, to ensure that the server exits. (Bug#25341)

A query that contained an EXIST subquery with a UNION over correlated and uncorrelated SELECT queries could cause the server to crash. (Bug#25219)

mysql_kill() caused a server crash when used on an SSL connection. (Bug#25203)

yaSSL was sensitive to the presence of whitespace at the ends of lines in PEM-encoded certificates, causing a server crash. (Bug#25189)

A query with ORDER BY and GROUP BY clauses where the ORDER BY clause had more elements than the GROUP BY clause caused a memory overrun leading to a crash of the server. (Bug#25172)

Use of ON DUPLICATE KEY UPDATE defeated the usual restriction against inserting into a join-based view unless only one of the underlying tables is used. (Bug#25123)

Using a view in combination with a USING clause caused column aliases to be ignored. (Bug#25106)

A multiple-table DELETE QUICK could sometimes cause one of the affected tables to become corrupted. (Bug#25048)

ALTER TABLE ... ENABLE KEYS acquired a global lock, preventing concurrent execution of other statements that use tables. . (Bug#25044)

An assertion failed incorrectly for prepared statements that contained a single-row uncorrelated subquery that was used as an argument of the IS NULL predicate. (Bug#25027)

A return value of -1 from user-defined handlers was not handled well and could result in conflicts with server code. (Bug#24987)

Accessing a fixed record format table with a crashed key definition results in server/myisamchk segmentation fault. (Bug#24855)

mysqld_multi and mysqlaccess looked for option files in /etc even if the --sysconfdir option for configure had been given to specify a different directory. (Bug#24780)

If there was insufficient memory available to mysqld, this could sometimes cause the server to hang during startup. (Bug#24751)

Optimizations that are legal only for subqueries without tables and WHERE conditions were applied for any subquery without tables. (Bug#24670)

If an ORDER BY or GROUP BY list included a constant expression being optimized away and, at the same time, containing single-row subselects that returned more that one row, no error was reported. If a query required sorting by expressions containing single-row subselects that returned more than one row, execution of the query could cause a server crash. (Bug#24653)

For ALTER TABLE, using ORDER BY expression could cause a server crash. Now the ORDER BY clause allows only column names to be specified as sort criteria (which was the only documented syntax, anyway). (Bug#24562)

A workaround was implemented to avoid a race condition in the NPTL pthread_exit() implementation. (Bug#24507)

mysqltest crashed with a stack overflow. (Bug#24498)

Within stored routines or prepared statements, inconsistent results occurred with multiple use of INSERT ... SELECT ... ON DUPLICATE KEY UPDATE when the ON DUPLICATE KEY UPDATE clause erroneously tried to assign a value to a column mentioned only in its SELECT part. (Bug#24491)

Expressions of the form (a, b) IN (SELECT a, MIN(b) FROM t GROUP BY a) could produce incorrect results when column a of table t contained NULL values while column b did not. (Bug#24420)

If a prepared statement accessed a view, access to the tables listed in the query after that view was checked in the security context of the view. (Bug#24404)

Attempts to access a MyISAM table with a corrupt column definition caused a server crash. (Bug#24401)

When opening a corrupted .frm file during a query, the server crashes. (Bug#24358)

Some joins in which one of the joined tables was a view could return erroneous results or crash the server. (Bug#24345)

A view was not handled correctly if the SELECT part contained “\Z”. (Bug#24293)

A query using WHERE unsigned_column NOT IN ('negative_value') could cause the server to crash. (Bug#24261)

Expressions of the form (a, b) IN (SELECT c, d ...) could produce incorrect results if a, b, or both were NULL. (Bug#24127)

A FETCH statement using a cursor on a table which was not in the table cache could sometimes cause the server to crash. (Bug#24117)

Queries that evaluate NULL IN (SELECT ... UNION SELECT ...) could produce an incorrect result (FALSE instead of NULL). (Bug#24085)

Hebrew-to-Unicode conversion failed for some characters. Definitions for the following Hebrew characters (as specified by the ISO/IEC 8859-8:1999) were added: LEFT-TO-RIGHT MARK (LRM), RIGHT-TO-LEFT MARK (RLM) (Bug#24037)

Some UPDATE statements were slower than in previous versions when the search key could not be converted to a valid value for the type of the search column. (Bug#24035)

ISNULL(DATE(NULL)) and ISNULL(CAST(NULL AS DATE)) erroneously returned false. (Bug#23938)

Within a stored routine, accessing a declared routine variable with PROCEDURE ANALYSE() caused a server crash. (Bug#23782)

When reading from the standard input on Windows, mysqlbinlog opened the input in text mode rather than binary mode and consequently misinterpreted some characters such as Control-Z. (Bug#23735)

OPTIMIZE TABLE tried to sort R-tree indexes such as spatial indexes, although this is not possible (see Section 12.4.2.5, “OPTIMIZE TABLE Syntax”). (Bug#23578)

For an InnoDB table with any ON DELETE trigger, TRUNCATE TABLE mapped to DELETE and activated triggers. Now a fast truncation occurs and triggers are not activated. . (Bug#23556)

The row count for MyISAM tables was not updated properly, causing SHOW TABLE STATUS to report incorrect values. (Bug#23526)

User-defined variables could consume excess memory, leading to a crash caused by the exhaustion of resources available to the MEMORY storage engine, due to the fact that this engine is used by MySQL for variable storage and intermediate results of GROUP BY queries. Where SET had been used, such a condition could instead give rise to the misleading error message You may only use constant expressions with SET, rather than Out of memory (Needed NNNNNN bytes). (Bug#23443)

With ONLY_FULL_GROUP_BY enabled, the server was too strict: Some expressions involving only aggregate values were rejected as nonaggregate (for example, MAX(a) – MIN(a)). (Bug#23417)

The arguments to the ENCODE() and the DECODE() functions were not printed correctly, causing problems in the output of EXPLAIN EXTENDED and in view definitions. (Bug#23409)

A table created with the ROW_FORMAT = FIXED table option lost the option if an index was added or dropped with CREATE INDEX or DROP INDEX. (Bug#23404)

A deadlock could occur, with the server hanging on Closing tables, with a sufficient number of concurrent INSERT DELAYED, FLUSH TABLES, and ALTER TABLE operations. (Bug#23312)

Some queries against INFORMATION_SCHEMA that used subqueries failed. . (Bug#23299)

readline detection did not work correctly on NetBSD. (Bug#23293)

If there was insufficient memory to store or update a blob record in a MyISAM table then the table will marked as crashed. (Bug#23196)

LAST_INSERT_ID() was not reset to 0 if INSERT ... SELECT inserted no rows. (Bug#23170)

A compressed MyISAM table that became corrupted could crash myisamchk and possibly the MySQL Server. (Bug#23139)

The number of setsockopt() calls performed for reads and writes to the network socket was reduced to decrease system call overhead. (Bug#22943)

mysql_upgrade failed when called with a --basedir path name containing spaces. (Bug#22801)

SET lc_time_names = value allowed only exact literal values, not expression values. (Bug#22647)

The STDDEV() function returned a positive value for data sets consisting of a single value. (Bug#22555)

Storing values specified as hexadecimal values 64 or more bits long in BIT(64), BIGINT, or BIGINT UNSIGNED columns did not raise any warning or error if the value was out of range. (Bug#22533)

SHOW COLUMNS reported some NOT NULL columns as NULL. (Bug#22377)

Type conversion errors during formation of index search conditions were not correctly checked, leading to incorrect query results. (Bug#22344)

Changing the value of MI_KEY_BLOCK_LENGTH in myisam.h and recompiling MySQL resulted in a myisamchk that saw existing MyISAM tables as corrupt. (Bug#22119)

A crash of the MySQL Server could occur when unpacking a BLOB column from a row in a corrupted MyISAM table. This could happen when trying to repair a table using either REPAIR TABLE or myisamchk; it could also happen when trying to access such a “broken” row using statements like SELECT if the table was not marked as crashed. (Bug#22053)

The code for generating USE statements for binary logging of CREATE PROCEDURE statements resulted in confusing output from mysqlbinlog for DROP PROCEDURE statements. (Bug#22043)

For the IF() and COALESCE() function and CASE expressions, large unsigned integer values could be mishandled and result in warnings. (Bug#22026)

SSL connections could hang at connection shutdown. (Bug#21781, Bug#24148)

The FEDERATED storage engine did not support the euckr character set. (Bug#21556)

When updating a table that used a JOIN of the table itself (for example, when building trees) and the table was modified on one side of the expression, the table would either be reported as crashed or the wrong rows in the table would be updated. (Bug#21310)

mysqld_error.h was not installed when only the client libraries were built. (Bug#21265)

InnoDB: During a restart of the MySQL Server that followed the creation of a temporary table using the InnoDB storage engine, MySQL failed to clean up in such a way that InnoDB still attempted to find the files associated with such tables. (Bug#20867)

Inserting DEFAULT into a column with no default value could result in garbage in the column. Now the same result occurs as when inserting NULL into a NOT NULL column. (Bug#20691)

A stored routine containing semicolon in its body could not be reloaded from a dump of a binary log. (Bug#20396)

SELECT ... FOR UPDATE, SELECT ... LOCK IN SHARE MODE, DELETE, and UPDATE statements executed using a full table scan were not releasing locks on rows that did not satisfy the WHERE condition. (Bug#20390)

On Windows, if the server was installed as a service, it did not auto-detect the location of the data directory. (Bug#20376)

The BUILD/check-cpu script did not recognize Celeron processors. (Bug#20061)

If a duplicate key value was present in the table, INSERT ... ON DUPLICATE KEY UPDATE reported a row count indicating that a record was updated, even when no record actually changed due to the old and new values being the same. Now it reports a row count of zero. (Bug#19978)

See also Bug#27006, Bug#27033, Bug#27210.

ORDER BY values of the DOUBLE or DECIMAL types could change the result returned by a query. (Bug#19690)

The readline library wrote to uninitialized memory, causing mysql to crash. (Bug#19474)

mysqltest incorrectly tried to retrieve result sets for some queries where no result set was available. (Bug#19410)

Use of already freed memory caused SSL connections to hang forever. (Bug#19209)

Some CASE statements inside stored routines could lead to excessive resource usage or a crash of the server. (Bug#19194, Bug#24854)

Instance Manager could crash during shutdown. (Bug#19044)

The server might fail to use an appropriate index for DELETE when ORDER BY, LIMIT, and a nonrestricting WHERE are present. (Bug#17711)

No warning was issued for use of the DATA DIRECTORY or INDEX DIRECTORY table options on a platform that does not support them. (Bug#17498)

The FEDERATED storage engine did not support the utf8 character set. (Bug#17044)

The optimizer removes expressions from GROUP BY and DISTINCT clauses if they happen to participate in expression = constant predicates of the WHERE clause, the idea being that, if the expression is equal to a constant, then it cannot take on multiple values. However, for predicates where the expression and the constant item are of different result types (for example, when a string column is compared to 0), this is not valid, and can lead to invalid results in such cases. The optimizer now performs an additional check of the result types of the expression and the constant; if their types differ, then the expression is not removed from the GROUP BY list. (Bug#15881)

When a prepared statement failed during the prepare operation, the error code was not cleared when it was reused, even if the subsequent use was successful. (Bug#15518)

Dropping a user-defined function sometimes did not remove the UDF entry from the mysql.proc table. (Bug#15439)

Inserting a row into a table without specifying a value for a BINARY(N) NOT NULL column caused the column to be set to spaces, not zeroes. (Bug#14171)

On Windows, the SLEEP() function could sleep too long, especially after a change to the system clock. (Bug#14094, Bug#24686, Bug#17635)

mysqldump --order-by-primary failed if the primary key name was an identifier that required quoting. (Bug#13926)

To enable installation of MySQL RPMs on Linux systems running RHEL 4 (which includes SE-Linux) additional information was provided to specify some actions that are allowed to the MySQL binaries. (Bug#12676)

The presence of ORDER BY in a view definition prevented the MERGE algorithm from being used to resolve the view even if nothing else in the definition required the TEMPTABLE algorithm. (Bug#12122)

The internal functions for table preparation, creation, and alteration were not re-execution friendly, causing problems in code that: repeatedly altered a table; repeatedly created and dropped a table; opened and closed a cursor on a table, altered the table, and then reopened the cursor; used ALTER TABLE to change a table's current AUTO_INCREMENT value; created indexes on utf8 columns.

Re-execution of CREATE DATABASE, CREATE TABLE, and ALTER TABLE statements in stored routines or as prepared statements also caused incorrect results or crashes. (Bug#4968, Bug#6895, Bug#19182, Bug#19733, Bug#22060, Bug#24879)