Appendix聽D.聽MySQL Community Server Enhancements and Release Notes - MySQL 5.0参考手册英文版

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.)

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聽13.5.4.22, 鈥�SHOW PROFILES and SHOW PROFILE Syntax鈥�, and Section聽20.17, 鈥淭he INFORMATION_SCHEMA PROFILING Table鈥�. (From Jeremy Cole) (Bug#24795)

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

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)

NDB Cluster: The LockPagesInMainMemory configuration parameter has changed its type and possible values. For more information, see LockPagesInMainMemory. (Bug#25686)

Important: The values true and false are no longer accepted for this parameter. If you were using this parameter and had it set to false in a previous release, you must change it to 0. If you had this parameter set to true, you should instead use 1 to obtain the same behavior as previously, or 2 to take advantage of new functionality introduced with this release described in the section cited above.

Important: When using MERGE tables the definition of the MERGE table and the 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. If there is a difference in any one of the tables then the statement will fail.

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 bundled yaSSL library was upgraded to version 1.5.8.

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)

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.

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 true 0xff in their 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)

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

If the 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)

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)

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)

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

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

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

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)

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)

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

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)

Using an INFORMATION_SCHEMA table with ORDER BY in a subquery could cause a server crash. (Bug#24630, Bug#26556)

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

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

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

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)

ORDER BY on DOUBLE values could change the set of rows returned by a query. (Bug#19690)

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)

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

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

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

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

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

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

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

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

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

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

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

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

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)

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

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

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

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

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

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

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)

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

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

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).

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).

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

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

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).

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)

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

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

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 return more that one row, no error was reported. If a query requires sorting by expressions containing single-row subselects that return more than one row, execution of the query may cause a server crash. (Bug#24653)

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

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)

When SET PASSWORD was written to the binary log double quotes were included in the statement. If the slave was running in with the sql_mode set to ANSI_QUOTES the event would fail and halt the replication process. (Bug#24158)

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

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

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)

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)

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

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)

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)

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

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)

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)

mysql_upgrade failed when called with a basedir pathname containing spaces. (Bug#22801)

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)

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

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

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)

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

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)

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

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)

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

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

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

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

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

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

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

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

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

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)

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

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

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)

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)

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

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

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. (Bug#4968, Bug#6895, Bug#19182, Bug#19733)

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

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

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

NDB 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)

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

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

NDB 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)

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

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

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

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

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

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

NDB 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)

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

The server was built even when configure was run with the --without-server option. (Bug#23973)

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

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

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

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)

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

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

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

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)

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

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)

A user-defined variable could be assigned an incorrect value if a temporary table was employed in obtaining the result of the query used to determine its value. (Bug#16861)

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)

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

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

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

OPTIMIZE TABLE tried to sort R-tree indexes such as spatial indexes, although this is not possible (see Section聽13.5.2.5, 鈥�OPTIMIZE TABLE Syntax鈥�). (Bug#23578)

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)

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)

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

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

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 鈥�broken鈥� row using statements like SELECT if the table was not marked as crashed. (Bug#22053)

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

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

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

NDB Cluster (NDB 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)

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

NDB 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)

Incompatible change: The prepared_stmt_count system variable has been converted to the Prepared_stmt_count global status variable (viewable with the SHOW GLOBAL STATUS statement). (Bug#23159)

NDB Cluster: Setting the configuration parameter LockPagesInMainMemory had no effect. (Bug#24461)

NDB Cluster: It is now possible to create a unique hashed index on a column that is not defined as NOT NULL. Note that this change applies only to tables using the NDB storage engine.

Unique indexes on columns in NDB tables do not store null values because they are mapped to primary keys in an internal index table (and primary keys cannot contain nulls).

Normally, an additional ordered index is created when one creates unique indexes on NDB table columns; this can be used to search for NULL values. However, if USING HASH is specified when such an index is created, no ordered index is created.

The reason for permitting unique hash indexes with null values is that, in some cases, the user wants to save space if a large number of records are pre-allocated but not fully initialized. This also assumes that the user will not try to search for null values. Since MySQL does not support indexes that are not allowed to be searched in some cases, the NDB storage engine uses a full table scan with pushed conditions for the referenced index columns to return the correct result.

Note that a warning is returned if one creates a unique nullable hash index, since the query optimizer should be provided a hint not to use it with NULL values if this can be avoided.

(Bug#21507)

In MySQL 5.0.13 and up, InnoDB rolls back only the last statement on a transaction timeout. A new option, --innodb_rollback_on_timeout, causes InnoDB to abort and roll back the entire transaction if a transaction timeout occurs (the same behavior as before MySQL 5.0.13). (Bug#24200)

DROP TRIGGER now supports an IF EXISTS clause. (Bug#23703)

The Com_create_user status variable was added (for counting CREATE USER statements). (Bug#22958)

The --memlock option relies on system calls that are unreliable on some operating systems. If a crash occurs, the server now checks whether --memlock was specified and if so issues some information about possible workarounds. (Bug#22860)

The bundled yaSSL library was upgraded to version 1.5.0.

In MySQL 5.0.13 and up, InnoDB rolls back only the last statement on a transaction timeout. A new option, --innodb_rollback_on_timeout, causes InnoDB to abort and roll back the entire transaction if a transaction timeout occurs (the same behavior as before MySQL 5.0.13). (Bug#24200)

If the user specified the server options --max-connections=N or --table-open-cache=M, a warning would be given in some cases that some values were recalculated, with the result that --table-open-cache could be assigned greater value.

It should be noted that, in such cases, both the warning and the increase in the --table-open-cache value were completely harmless. Note also that it is not possible for the MySQL Server to predict or to control limitations on the maximum number of open files, since this is determined by the operating system.

The recalculation code has now been fixed to ensure that the value of --table-open-cache is no longer increased automatically, and that a warning is now given only if some values had to be decreased due to operating system limits.

(Bug#21915)

NDB Cluster: The HELP command in the Cluster management client now provides command-specific help. For example, HELP RESTART in ndb_mgm provides detailed information about the START command. (Bug#19620)

NDB Cluster: Added the --bind-address option for ndbd. This allows a data node process to be bound to a specific network interface. (Bug#22195)

NDB Cluster: The Ndb_number_of_storage_nodes system variable was renamed to Ndb_number_of_data_nodes. (Bug#20848)

NDB Cluster: The ndb_config utility now accepts -c as a short form of the --ndb-connectstring option. (Bug#22295)

SHOW STATUS is no longer logged to the slow query log. (Bug#19764)

mysqldump --single-transaction now uses START TRANSACTION /*!40100 WITH CONSISTENT SNAPSHOT */ rather than BEGIN to start a transaction, so that a consistent snapshot will be used on those servers that support it. (Bug#19660)

mysql_upgrade now passes all the parameters specified on the command line to both mysqlcheck and mysql using the upgrade_defaults file. (Bug#20100)

For the CALL statement, stored procedures that take no arguments now can be invoked without parentheses. That is, CALL p() and CALL p are equivalent. (Bug#21462)

NDB Cluster: Sudden disconnection of an SQL or data node could lead to shutdown of data nodes with the error failed ndbrequire. (Bug#24447)

NDB Cluster: ndb_config failed when trying to use 2 management servers and node IDs. (Bug#23887)

NDB Cluster (Cluster APIs): Using BIT values with any of the comparison methods of the NdbScanFilter class caused the cluster's data nodes to fail. (Bug#24503)

NDB Cluster: The failure of a data node failure during a schema operation could lead to additional node failures. (Bug#24752)

NDB Cluster: A committed read could be attempted before a data node had time to connect, causing a timeout error. (Bug#24717)

NDB Cluster (Cluster APIs): Some MGM API function calls could yield incorrect return values in certain cases where the cluster was operating under a very high load, or experienced timeouts in inter-node communications. (Bug#24011)

NDB Cluster: A unique constraint violation was not ignored by an UPDATE IGNORE statement when the constraint violation occurred on a non-primary key. (Bug#18487, Bug#24303)

mysql_fix_privilege_tables did not handle a password containing embedded space or apostrophe characters. (Bug#17700)

Foreign key identifiers for InnoDB tables could not contain certain characters. (Bug#24299)

In some cases, the parser failed to distinguish a user-defined function from a stored function. (Bug#21809)

With innodb_file_per_table enabled, InnoDB displayed incorrect file times in the output from SHOW TABLE STATUS. (Bug#24712)

The stack size for NetWare binaries was increased to 128KB to prevent problems caused by insufficient stack size. (Bug#23504)

Attempting to use a view containing DEFINER information for a non-existent user resulted in an error message that revealed the definer account. Now the definer is revealed only to superusers. Other users receive only an access denied message. (Bug#17254)

mysql_upgrade failed if the --password (or -p) option was given. (Bug#24896)

For a nonexistent table, DROP TEMPORARY TABLE failed with an incorrect error message if read_only was enabled. (Bug#22077)

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)

The InnoDB mutex structure was simplified to reduce memory load. (Bug#24386)

The REPEAT() function could return NULL when passed a column for the count argument. (Bug#24947)

Accuracy was improved for comparisons between DECIMAL columns and numbers represented as strings. (Bug#23260)

InnoDB crashed while performing XA recovery of prepared transactions. (Bug#21468)

ROW_COUNT() did not work properly as an argument to a stored procedure. (Bug#23760)

The size of MEMORY tables and internal temporary tables was limited to 4GB on 64-bit Windows systems. (Bug#24052)

For queries that select from a view, the server was returning MYSQL_FIELD metadata inconsistently for view names and table names. For view columns, the server now returns the view name in the table field and, if the column selects from an underlying table, the table name in the org_table field. (Bug#20191)

It was possible to use DATETIME values whose year, month, and day parts were all zeroes but whose hour, minute, and second parts contained nonzero values, an example of such an illegal DATETIME being '0000-00-00 11:23:45'. (Bug#21789)

It was possible to set the backslash character (鈥�\鈥�) as the delimiter character using DELIMITER, but not actually possible to use it as the delimiter. (Bug#21412)

The loose index scan optimization for GROUP BY with MIN or MAX was not applied within other queries, such as CREATE TABLE ... SELECT ..., INSERT ... SELECT ..., or in the FROM clauses of subqueries. (Bug#24156)

ALTER ENABLE KEYS or ALTER TABLE DISABLE KEYS combined with another ALTER TABLE option other than RENAME TO did nothing. In addition, if ALTER TABLE was used on a table having disabled keys, the keys of the resulting table were enabled. (Bug#24395)

Queries using a column alias in an expression as part of an ORDER BY clause failed, an example of such a query being SELECT mycol + 1 AS mynum FROM mytable ORDER BY 30 - mynum. (Bug#22457)

Trailing spaces were not removed from Unicode CHAR column values when used in indexes. This resulted in excessive usage of storage space, and could affect the results of some ORDER BY queries that made use of such indexes.

Note: When upgrading, it is necessary to re-create any existing indexes on Unicode CHAR columns in order to take advantage of the fix. This can be done by using a REPAIR TABLE statement on each affected table.

(Bug#22052)

Warnings were generated when explicitly casting a character to a number (for example, CAST('x' AS SIGNED)), but not for implicit conversions in simple arithmetic operations (such as 'x' + 0). Now warnings are generated in all cases. (Bug#11927)

STR_TO_DATE() returned NULL if the format string contained a space following a non-format character. (Bug#22029)

yaSSL crashed on pre-Pentium Intel CPUs. (Bug#21765)

Selecting into variables sometimes returned incorrect wrong results. (Bug#20836)

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)

mysql_fix_privilege_tables.sql altered the table_privs.table_priv column to contain too few privileges, causing loss of the CREATE VIEW and SHOW VIEW privileges. (Bug#20589)

A query with a subquery that references columns of a view from the outer SELECT could return an incorrect result if used from a prepared statement. (Bug#20327)

A server crash occurred when using LOAD DATA to load a table containing a NOT NULL spatial column, when the statement did not load the spatial column. Now a NULL supplied to NOT NULL column error occurs. (Bug#22372)

Unsigned BIGINT values treated as signed values by the MOD() function. (Bug#19955)

Compiling PHP 5.1 with the MySQL static libraries failed on some versions of Linux. (Bug#19817)

The DELIMITER statement did not work correctly when used in an SQL file run using the SOURCE statement. (Bug#19799)

VARBINARY column values inserted on a MySQL 4.1 server had trailing zeroes following upgrade to MySQL 5.0 or later. (Bug#19371)

Constant expressions and some numeric constants used as input parameters to user-defined functions were not treated as constants. (Bug#18761)

Subqueries of the form NULL IN (SELECT ...) returned invalid results. (Bug#8804, Bug#23485)

The --extern option for mysql-test-run.pl did not function correctly. (Bug#24354)

INET_ATON() returned a signed BIGINT value, not an unsigned value. (Bug#21466)

ALTER TABLE statements that performed both RENAME TO and {ENABLE|DISABLE} KEYS operations caused a server crash. (Bug#24089)

myisampack wrote to unallocated memory, causing a crash. (Bug#17951)

Some small double precision numbers (such as 1.00000001e-300) that should have been accepted were truncated to zero. (Bug#22129)

The mysql.server script used the source command, which is less portable than the . command; it now uses . instead. (Bug#24294)

DATE_ADD() requires complete dates with no 鈥�zero鈥� parts, but sometimes did not return NULL when given such a date. (Bug#22229)

Using FLUSH TABLES in one connection while another connection is using HANDLER statements caused a server crash. (Bug#21587)

FLUSH LOGS or mysqladmin flush-logs caused a server crash if the binary log was not open. (Bug#17733)

Subqueries for which a pushed-down condition did not produce exactly one key field could cause a server crash. (Bug#24056)

LAST_DAY('0000-00-00') could cause a server crash. (Bug#23653)

Through the C API, the member strings in MYSQL_FIELD for a query that contains expressions may return incorrect results. (Bug#21635)

mysql_affected_rows() could return values different from mysql_stmt_affected_rows() for the same sequence of statements. (Bug#23383)

IN() and CHAR() can return NULL, but did not signal that to the query processor, causing incorrect results for IS NULL operations. (Bug#17047)

A trigger that invoked a stored function could cause a server crash when activated by different client connections. (Bug#23651)

CONCURRENT did not work correctly for LOAD DATA INFILE. (Bug#20637)

Inserting a default or invalid value into a spatial column could fail with Unknown error rather than a more appropriate error. (Bug#21790)

The server could send incorrect column count information to the client for queries that produce a larger number of columns than can fit in a two-byte number. (Bug#19216)

Evaluation of subqueries that require the filesort algorithm were allocating and freeing the sort_buffer_size buffer many times, resulting in slow performance. Now the buffer is allocated once and reused. (Bug#21727)

SQL statements close to the size of max_allowed_packet could produce binary log events larger than max_allowed_packet that could not be read by slave servers. (Bug#19402)

View columns were always handled as having implicit derivation, leading to illegal mix of collation errors for some views in UNION operations. Now view column derivation comes from the original expression given in the view definition. (Bug#21505)

If elements in a non-top-level IN subquery were accessed by an index and the subquery result set included a NULL value, the quantified predicate that contained the subquery was evaluated to NULL when it should return a non-NULL value. (Bug#23478)

Calculation of COUNT(DISTINCT), AVG(DISTINCT), or SUM(DISTINCT) when they are referenced more than once in a single query with GROUP BY could cause a server crash. (Bug#23184)

For a cast of a DATETIME value containing microseconds to DECIMAL, the microseconds part was truncated without generating a warning. Now the microseconds part is preserved. (Bug#19491)

Metadata for columns calculated from scalar subqueries was limited to integer, double, or string, even if the actual type of the column was different. (Bug#11032)

The result for CAST() when casting a value to UNSIGNED was limited to the maximum signed BIGINT value, not the maximum unsigned value. (Bug#8663)

Using EXPLAIN caused a server crash for queries that selected from INFORMATION_SCHEMA in a subquery in the FROM clause. (Bug#22413)

Invalidating the query cache caused a server crash for INSERT INTO ... SELECT statements that selected from a view. (Bug#20045)

Slave servers would retry the execution of a SQL statement an infinite number of times, ignoring the value SLAVE_TRANSACTION_RETRIES when using the NDB engine. (Bug#16228)

On slave servers, transactions that exceeded the lock wait timeout failed to roll back properly. (Bug#20697)

Changes to character set variables prior to an action on a replication-ignored table were forgotten by slave servers. (Bug#22877)

With lower_case_table_names set to 1, SHOW CREATE TABLE printed incorrect output for table names containing Turkish I (LATIN CAPITAL LETTER I WITH DOT ABOVE). (Bug#20404)

When applying the group_concat_max_len limit, GROUP_CONCAT() could truncate multi-byte characters in the middle. (Bug#23451)

For some problems relating to character set conversion or incorrect string values for INSERT or UPDATE, the server was reporting truncation or length errors instead. (Bug#18908)

Several string functions could return incorrect results when given very large length arguments. (Bug#10963)

Certain malformed INSERT statements could crash the mysql client. (Bug#21142)

NDB Cluster: Data nodes added while the cluster was running in single user mode were all assigned node ID 0, which could later cause multiple node failures. Adding of nodes in single user mode is no longer possible. (Bug#20395)

NDB Cluster: Attempting to create an NDB table on a MySQL with an existing non-Cluster table with the same name in the same database could result in data loss or corruption. MySQL now issues a warning when a SHOW TABLES or other statement causing table discovery finds such a table. (Bug#21378)

NDB Cluster (NDB API): Inacivity timeouts for scans were not correctly handled. (Bug#23107)

NDB Cluster (NDB API): Attempting to read a nonexistent tuple using Commit mode for NdbTransaction::execute() caused node failures. (Bug#22672)

NDB Cluster (NDB API): Scans closed before being executed were still placed in the send queue. (Bug#21941)

NDB Cluster (NDB API): The NdbOperation::getBlobHandle() method, when called with the name of a nonexistent column, caused a segmentation fault. (Bug#21036)

NDB Cluster: A problem with takeover during a system restart caused ordered indexes to be rebuilt incorrectly. (Bug#15303)

NDB Cluster: The ndb_config utility did not perform host lookups correctly when using the --host option. (Bug#17582)

NDB Cluster: The ndb_config utility did not perform host lookups correctly when using the --host option (Bug#17582)

NDB Cluster: The error returned by the cluster when too many nodes were defined did not make clear the nature of the problem. (Bug#19045)

NDB Cluster: ndb_mgm -e show | head would hang after displaying the first 10 lines of output. (Bug#19047)

NDB Cluster: In rare situations with resource shortages, a crash could result from insufficient IndexScanOperations. (Bug#19198)

NDB Cluster: ndb_restore did not always make clear that it had recovered successfully from temporary errors while restoring a cluster backup. (Bug#19651)

NDB Cluster: Error messages given when trying to make online changes parameters such as NoOfReplicas thast can only be changed via a complete shutdown and restart of the cluster did not indicate the true nature of the problem. (Bug#19787)

NDB Cluster: Following the restart of an MGM node, the Cluster management client did not automatically reconnect. (Bug#19873)

NDB Cluster: In some cases where SELECT COUNT(*) from an NDB table should have yielded an error, MAX_INT was returned instead. (Bug#19914)

NDB Cluster (NDB API): When multiple processes or threads in parallel performed the same ordered scan with exclusive lock and updating the retrieved records, the scan could skip some records, which were not updated as a result. (Bug#20446)

NDB Cluster: Using an invalid node ID with the management client STOP command could cause ndb_mgm to hang. (Bug#20575)

NDB Cluster: Under some circumstances, local checkpointing would hang, keeping any unstarted nodes from being started. (Bug#20895)

NDB Cluster: Condition pushdown did not work correctly with DATETIME columns. (Bug#21056)

NDB Cluster: When inserting a row into an NDB table with a duplicate value for a non-primary unique key, the error issued would reference the wrong key. (Bug#21072)

NDB Cluster: Cluster logs were not rotated following the first rotation cycle. (Bug#21345)

NDB Cluster: The ndb_mgm management client did not set the exit status on errors, always returning 0 instead. (Bug#21530)

NDB Cluster: Partition distribution keys were updated only for the primary and starting replicas during node recovery. This could lead to node failure recovery for clusters having an odd number of replicas. (Bug#21535)

Note: We recommend values for NumberOfReplicas that are even powers of 2, for best results.

NDB Cluster: The output for the --help option used with NDB executable programs (ndbd, ndb_mgm, ndb_restore, ndb_config, and so on) referred to the Ndb.cfg file, instead of my.cnf. (Bug#21585)

NDB Cluster: The node recovery algorithm was missing a version check for tables in the ALTER_TABLE_COMMITTED state (as opposed to the TABLE_ADD_COMMITTED state, which has the version check). This could cause inconsistent schemas across nodes following node recovery. (Bug#21756)

NDB Cluster: A scan timeout returned Error 4028 (Node failure caused abort of transaction) instead of Error 4008 (Node failure caused abort of transaction...). (Bug#21799)

NDB Cluster: The --help output from NDB binaries did not include file-related options. (Bug#21994)

NDB Cluster: Multiple node restarts in rapid succession could cause a system restart to fail (Bug#22892), or induce a race condition (Bug#23210).

NDB Cluster: If a node restart could not be performed from the REDO log, no node takeover took place. This could cause partitions to be left empty during a system restart. (Bug#22893)

NDB Cluster: INSERT ... ON DUPLICATE KEY UPDATE on an NDB table could lead to deadlocks and memory leaks. (Bug#23200)

NDB Cluster: The management client command ALL DUMP 1000 would cause the cluster to crash if data nodes were connected to the cluster but not yret fully started. (Bug#23203)

NDB Cluster: Cluster backups would fail when there were more than 2048 schema objects in the cluster. (Bug#23499)

NDB Cluster: Restoring a cluster failed if there were any tables with 128 or more columns. (Bug#23502)

If an init_connect SQL statement produced an error, the connection was silently terminated with no error message. Now the server writes a warning to the error log. (Bug#22158)

The internal SQL interpreter of InnoDB placed an unnecessary lock on the supremum record when innodb_locks_unsafe_for_binlog=1. This caused an assertion failure when InnoDB was built with debugging enabled. (Bug#23769)

If a table contains an AUTO_INCREMENT column, inserting into an insertable view on the table that does not include the AUTO_INCREMENT column should not change the value of LAST_INSERT_ID(), because the side effects of inserting default values into columns not part of the view should not be visible. MySQL was incorrectly setting LAST_INSERT_ID() to zero. (Bug#22584)

M % 0 returns NULL, but (M % 0) IS NULL evaluated to false. (Bug#23411)

Within a stored routine, a view definition cannot refer to routine parameters or local variables. However, an error did not occur until the routine was called. Now it occurs during parsing of the routine creation statement. (Bug#20953)

Note: A side effect of this fix is that if you have already created such routines, and error will occur if you execute SHOW CREATE PROCEDURE or SHOW CREATE FUNCTION. You should drop these routines because they are erroneous.

A client library crash was caused by executing a statement such as SELECT * FROM t1 PROCEDURE ANALYSE() using a server side cursor on a table t1 that does not have the same number of columns as the output from PROCEDURE ANALYSE(). (Bug#17039)

mysql did not check for errors when fetching data during result set printing. (Bug#22913)

Adding a day, month, or year interval to a DATE value produced a DATE, but adding a week interval produced a DATETIME value. Now all produce a DATE value. (Bug#21811)

The column default value in the output from SHOW COLUMNS or SELECT FROM INFORMATION_SCHEMA.COLUMNS was truncated to 64 characters. (Bug#23037)

For not-yet-authenticated connections, the Time column in SHOW PROCESSLIST was a random value rather than NULL. (Bug#23379)

The Host column in SHOW PROCESSLIST output was blank when the server was started with the --skip-grant-tables option. (Bug#22728)

The Handler_rollback status variable sometimes was incremented when no rollback had taken place. (Bug#22728)

Within a prepared statement, SELECT (COUNT(*) = 1) (or similar use of other aggregate functions) did not return the correct result for statement re-execution. (Bug#21354)

Lack of validation for input and output TIME values resulted in several problems: SEC_TO_TIME() within subqueries incorrectly clipped large values; SEC_TO_TIME() treated BIGINT UNSIGNED values as signed; only truncation warnings were produced when both truncation and out-of-range TIME values occurred. (Bug#11655, Bug#20927)

Range searches on columns with an index prefix could miss records. (Bug#20732)

With SQL_MODE=TRADITIONAL, MySQL incorrectly aborted on warnings within stored routines and triggers. (Bug#20028)

In mysql, invoking connect or \r with very long db_name or host_name parameters caused buffer overflow. (Bug#20894)

mysqldump --xml produced invalid XML for BLOB data. (Bug#19745)

For a debug server, a reference to an undefined user variable in a prepared statment executed with EXECUTE caused an assertion failure. (Bug#19356)

Within a trigger for a base table, selecting from a view on that base table failed. (Bug#19111)

DELETE IGNORE could hang for foreign key parent deletes. (Bug#18819)

Transient errors in replication from master to slave may trigger multiple Got fatal error 1236: 'binlog truncated in the middle of event' errors on the slave. (Bug#4053)

The value of the warning_count system variable was not being calculated correctly (also affecting SHOW COUNT(*) WARNINGS). (Bug#19024)

InnoDB exhibited thread thrashing with more than 50 concurrent connections under an update-intensive workload. (Bug#22868)

InnoDB showed substandard performance with multiple queries running concurrently. (Bug#15815)

There was a race condition in the InnoDB fil_flush_file_spaces() function. (Bug#24089)

FROM_UNIXTIME() did not accept arguments up to POWER(2,31)-1, which it had previously. (Bug#9191)

Some yaSSL-related memory leaks detected by Valgrind were fixed. (Bug#23981)

If COMPRESS() returned NULL, subsequent invocations of COMPRESS() within a result set or within a trigger also returned NULL. (Bug#23254)

mysql would lose its connection to the server if its standard output was not writable. (Bug#17583)

mysql-test-run did not work correctly for RPM-based installations. (Bug#17194)

The return value from my_seek() was ignored. (Bug#22828)

Use of PREPARE with a CREATE PROCEDURE statement that contained a syntax error caused a server crash. (Bug#21868)

Use of a DES-encrypted SSL certificate file caused a server crash. (Bug#21868)

Column names were not quoted properly for replicated views. (Bug#19736)

InnoDB used table locks (not row locks) within stored functions. (Bug#18077)

Statements such as DROP PROCEDURE and DROP VIEW were written to the binary log too late due to a race condition. (Bug#14262)

MySQL would fail to build on the Alpha platform. (Bug#23256)

The optimizer failed to use equality propagation for BETWEEN and IN predicates with string arguments. (Bug#22753)

The optimizer used the ref join type rather than eq_ref for a simple join on strings. (Bug#22367)

The WITH CHECK OPTION for a view failed to prevent storing invalid column values for UPDATE statements. (Bug#16813)

A literal string in a GROUP BY clause could be interpreted as a column name. (Bug#14019)

Some queries that used MAX() and GROUP BY could incorrectly return an empty result. (Bug#22342)

WITH ROLLUP could group unequal values. (Bug#20825)

Use of a subquery that invoked a function in the column list of the outer query resulted in a memory leak. (Bug#21798)

LIKE searches failed for indexed utf8 character columns. (Bug#20471)

FLUSH INSTANCES in Instance Manager triggered an assertion failure. (Bug#19368)

ALTER TABLE was not able to rename a view. (Bug#14959)

Entries in the slow query log could have an incorrect Rows_examined value. (Bug#12240)

Insufficient memory (myisam_sort_buffer_size) could cause a server crash for several operations on MyISAM tables: repair table, create index by sort, repair by sort, parallel repair, bulk insert. (Bug#23175)

OPTIMIZE TABLE with myisam_repair_threads > 1 could result in MyISAM table corruption. (Bug#8283)

Selecting from a MERGE table could result in a server crash if the underlying tables had fewer indexes than the MERGE table itself. (Bug#22937)

A locking safety check in InnoDB reported a spurious error stored_select_lock_type is 0 inside ::start_stmt() for INSERT ... SELECT statements in innodb_locks_unsafe_for_binlog mode. The safety check was removed. (Bug#10746)

For multiple-table UPDATE statements, storage engines were not notified of duplicate-key errors. (Bug#21381)

Incorrect results could be obtained from re-execution of a parametrized prepared statement or a stored routine with a SELECT that uses LEFT JOIN with a second table having only one row. (Bug#21081)

An UPDATE that referred to a key column in the WHERE clause and activated a trigger that modified the column resulted in a loop. (Bug#20670)

Creating a TEMPORARY table with the same name as an existing table that was locked by another client could result in a lock conflict for DROP TEMPORARY TABLE because the server unnecessarily tried to acquire a name lock. (Bug#21096)

After FLUSH TABLES WITH READ LOCK followed by UNLOCK TABLES, attempts to drop or alter a stored routine failed with an error that the routine did not exist, and attempts to execute the routine failed with a lock conflict error. (Bug#21414)

SHOW VARIABLES truncated the Value field to 256 characters. (Bug#20862)

Instance Manager didn't close the client socket file when starting a new mysqld instance. mysqld inherited the socket, causing clients connected to Instance Manager to hang. (Bug#12751)

Instance Manager had a race condition involving mysqld PID file removal. (Bug#22379)

It was possible for a stored routine with a non-latin1 name to cause a stack overrun. (Bug#21311)

MySQL 5.0.26 introduced an ABI incompatibility, which this release reverts. Programs compiled against 5.0.26 are not compatible with any other version and must be recompiled. (Bug#23427)

InnoDB: Reduced optimization level for Windows 64 builds to handle possible memory overrun. (Bug#19424)

This is the last version for which binary MySQL-Max distributions are available, except for RPM distributions. (For RPM distributions, the last version is 5.0.37.)

MySQL 5.0.26 introduced an ABI incompatibility, which this release reverts. Programs compiled against 5.0.26 are not compatible with any other version and must be recompiled. (Bug#23427)