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MySQL 5.1 Release Notes  /  Changes in MySQL 5.1.48 (2010-06-02)

Changes in MySQL 5.1.48 (2010-06-02)

InnoDB Plugin Notes

  • InnoDB Plugin has been upgraded to version 1.0.9. This version is considered of General Availability (GA) quality.

    In this release, the InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), generic Linux RPM packages, and any builds produced with the icc compiler. It also does not work for FreeBSD 6 and HP-UX or for Linux on generic ia64.

Functionality Added or Changed

  • The Rows_examined value in slow query log rows now is nonzero for UPDATE and DELETE statements that modify rows. (Bug #49756)

Bugs Fixed

  • Security Fix: A security bug was fixed. (Bug #53907)

  • Security Fix: A security bug was fixed. (Bug #52357)

  • Security Fix: A security bug was fixed. (Bug #48157)

  • Important Change; Replication: MyISAM transactions replicated to a transactional slave left the slave in an unstable condition. This was due to the fact that, when replicating from a nontransactional storage engine to a transactional engine with autocommit disabled, no BEGIN and COMMIT statements were written to the binary log; thus, on the slave, a never-ending transaction was started.

    The fix for this issue includes enforcing autocommit mode on the slave by replicating all autocommit=1 statements from the master. (Bug #29288)

  • InnoDB; Replication: Reading from a table that used a self-logging storage engine and updating a table that used a transactional engine (such as InnoDB) generated changes that were written to the binary log using statement format which could make slaves diverge. However, when using mixed logging format, such changes should be written to the binary log using row format. (This issue did not occur when reading from tables using a self-logging engine and updating MyISAM tables, as this was already handled by checking for combinations of nontransactional and transactional engines.) Now such statements are classified as unsafe, and in mixed mode, cause a switch to row-based logging. (Bug #49019)

  • InnoDB: The server could crash with a message InnoDB: Assertion failure in thread nnnn, typically during shutdown on a Windows system. (Bug #53947)

  • InnoDB: Adding a unique key on multiple columns, where one of the columns is NULL, could mistakenly report duplicate key errors. (Bug #53290)

  • InnoDB: Fixed a checksum error reported for compressed tables when the --innodb_checksums option is enabled. Although the message stated that the table was corrupted, the table is actually fine. (Bug #53248)

  • InnoDB: Corrected the handling of the setting innodb_change_buffering=default. (The appropriate default value is different between MySQL 5.1 and 5.5.) (Bug #53165)

  • InnoDB: Multi-statement execution could fail with an error about foreign key constraints. This problem could affect calls to mysql_query() and mysql_real_query(), and CALL statements that invoke stored procedures. (Bug #48024)

  • InnoDB: If a crash occurs while creating an index using the InnoDB Fast Index Creation mechanism, the partially created index is dropped during the crash recovery processing when the database is restarted.

  • Partitioning: ALTER TABLE statements that cause table partitions to be renamed or dropped (such as ALTER TABLE ... ADD PARTITION, ALTER TABLE ... DROP PARTITION, and ALTER TABLE ... REORGANIZE PARTITION) — when run concurrently with queries against the INFORMATION_SCHEMA.PARTITIONS table — could fail, cause the affected partitioned tables to become unusable, or both. This was due to the fact that the INFORMATION_SCHEMA database ignored the name lock imposed by the ALTER TABLE statement on the partitions affected. In particular, this led to problems with InnoDB tables, because InnoDB would accept the rename operation, but put it in a background queue, so that subsequent rename operations failed when InnoDB was unable to find the correct partition. Now, INFORMATION_SCHEMA honors name locks imposed by ongoing ALTER TABLE statements that cause partitions to be renamed or dropped. (Bug #50561)

    References: See also Bug #47343, Bug #45808.

  • Partitioning: It was possible to execute a CREATE TEMPORARY TABLE tmp LIKE pt statement, where pt is a partitioned table, even though partitioned temporary tables are not permitted. This caused the server to crash. Now a check is performed to prevent such statements from being executed. (Bug #49477)

  • Partitioning: When attempting to perform DDL on a partitioned table and the table's .par file could not be found, the server returned the inaccurate error message Out of memory; restart server and try again (needed 2 bytes). Now in such cases, the server returns the error Failed to initialize partitions from .par file. (Bug #49161)

  • Replication: In some cases, attempting to update a column with a value of an incompatible type resulted in a mismatch between master and slave because the column value was set to its implicit default value on the master (as expected), but the same column on the slave was set to NULL. (Bug #52868)

  • Replication: When using a nontransactional table on the master with autocommit disabled, no COMMIT was recorded in the binary log following a statement affecting this table. If the slave's copy of the table used a transactional storage engine, the result on the slave was as though a transaction had been started, but never completed. (Bug #49522)

    References: See also Bug #29288.

  • Valgrind warnings resulting from passing incomplete DATETIME values to the TIMESTAMP() function were corrected. (Bug #53942)

  • UPDATE on an InnoDB table modifying the same index that was used to satisfy the WHERE condition could trigger a debug assertion under some circumstances. (Bug #53830)

  • MySQL incorrectly processed ALTER DATABASE `#mysql50#special` UPGRADE DATA DIRECTORY NAME where special was ., .., or a sequence starting with ./ or ../. It used the server data directory (which contains other regular databases) as the database directory. (Bug #53804, CVE-2010-2008)

  • InnoDB crashed when replacing duplicates in a table after a fast ALTER TABLE added a unique index. (Bug #53592)

  • For InnoDB tables, the error handler for a fast CREATE INDEX did not reset the error state of the transaction before attempting to undo a failed operation, resulting in a crash. (Bug #53591)

  • For single-table DELETE statements that used quick select and index scan simultaneously caused a server crash or assertion failure. (Bug #53450)

  • Incorrect results could be returned for LEFT JOIN of InnoDB tables with an impossible WHERE condition. (Bug #53334)

  • Setting the innodb_change_buffering system variable to DEFAULT produced an incorrect result. (Bug #53165)

  • mysqldump and SELECT ... INTO OUTFILE truncated long BLOB and TEXT values to 766 bytes. (Bug #53088)

  • In the debug version of the server, the FreeState() function could in some circumstances be called twice, leading to an assertion failure. (Bug #52884)

  • Aggregate functions could incorrectly return NULL in outer join queries. (Bug #52051)

  • For outer joins, the optimizer could fail to properly calculate table dependencies. (Bug #52005)

  • The Loose Index Scan optimization method assumed that it could depend on the partitioning engine to maintain interval endpoint information, as if it were a storage engine. (Bug #50939)

  • Calculation of intervals for Event Scheduler events was not portable. (Bug #50087)

  • Selecting from INFORMATION_SCHEMA.ROUTINES or INFORMATION_SCHEMA.PARAMETERS resulted in a memory leak. (Bug #48729)

  • On Intel x86 machines, the optimizer could choose different execution plans for a query depending on the compiler version and optimization flags used to build the server binary. (Bug #48537)

  • When the transaction isolation level was REPEATABLE READ and binary logging used statement or mixed format, SELECT statements with subqueries referencing InnoDB tables unnecessarily acquired shared locks on rows in these tables. (Bug #46947)

  • Using an initial command with mysql_options(..., MYSQL_INIT_COMMAND, ...) that generated multiple result sets (such as a stored procedure or a multi-statement command) left the connection unusable. (Bug #42373)

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