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MySQL 5.1 Release Notes  /  Changes in MySQL 5.1.49 (2010-07-09)

Changes in MySQL 5.1.49 (2010-07-09)

InnoDB Plugin Notes

  • InnoDB Plugin has been upgraded to version 1.0.10. 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

  • InnoDB: The mechanism that checks if there is enough space for redo logs was improved, reducing the chance of encountering this message: ERROR: the age of the last checkpoint is x, which exceeds the log group capacity y. (Bug #39168)

Bugs Fixed

  • Security Fix; InnoDB: After changing the values of the innodb_file_format or innodb_file_per_table configuration parameters, DDL statements could cause a server crash. (Bug #55039, CVE-2010-3676)

  • Security Fix: Joins involving a table with a unique SET column could cause a server crash. (Bug #54575, CVE-2010-3677)

  • Security Fix: Incorrect handling of NULL arguments could lead to a crash for IN() or CASE operations when NULL arguments were either passed explicitly as arguments (for IN()) or implicitly generated by the WITH ROLLUP modifier (for IN() and CASE). (Bug #54477, CVE-2010-3678)

  • Security Fix: A malformed argument to the BINLOG statement could result in Valgrind warnings or a server crash. (Bug #54393, CVE-2010-3679)

  • Security Fix: Use of TEMPORARY InnoDB tables with nullable columns could cause a server crash. (Bug #54044, CVE-2010-3680)

  • Security Fix: The server could crash if there were alternate reads from two indexes on a table using the HANDLER interface. (Bug #54007, CVE-2010-3681)

  • Security Fix: A security bug was fixed. (Bug #53933)

  • Security Fix: Using EXPLAIN with queries of the form SELECT ... UNION ... ORDER BY (SELECT ... WHERE ...) could cause a server crash. (Bug #52711, CVE-2010-3682)

  • Security Fix: LOAD DATA INFILE did not check for SQL errors and sent an OK packet even when errors were already reported. Also, an assert related to client/server protocol checking in debug servers sometimes was raised when it should not have been. (Bug #52512, CVE-2010-3683)

  • Security Fix: A security bug was fixed. (Bug #52315)

  • InnoDB: An ALTER TABLE statement could convert an InnoDB compressed table (with row_format=compressed) back to an uncompressed table (with row_format=compact). (Bug #54679)

  • InnoDB: InnoDB could issue an incorrect message on startup, if tables were created under the setting innodb_file_per_table=ON. The message was of the form InnoDB: Warning: allocated tablespace n, old maximum was 0. If you encounter this message after upgrading, create an InnoDB table with innodb_file_per_table = ON and restart the server. The message should not be displayed any more. If you continue to encounter this message, or if you get it and haven't used a version without this fix, you might have corruption in your shared tablespace. If so, back up and reload your data. (Bug #54658)

  • InnoDB: Fast index creation in the InnoDB Plugin could fail, leaving the new secondary index corrupted. (Bug #54330)

  • InnoDB: Some combinations of SELECT and SELECT FOR UPDATE statements could fail with errors about locks, or incorrectly release a row lock during a semi-consistent read operation. (Bug #53674)

  • InnoDB: Performing large numbers of RENAME TABLE statements caused excessive memory use. (Bug #47991)

  • Replication: When using unique keys on NULL columns in row-based replication, the slave sometimes chose the wrong row when performing an update. This happened because a table having a unique key on such a column could have multiple rows containing NULL for the column used by the unique key, and the slave merely picked the first row containing NULL in that column. (Bug #53893)

  • Replication: FLUSH LOGS could in some circumstances crash the server. This occurred because the I/O thread could concurrently access the relay log I/O cache while another thread was performing the FLUSH LOGS, which closes and reopens the relay log and, while doing so, initializes (or re-initializes) its I/O cache. This could cause problems if some other thread (in this case, the I/O thread) is accessing it at the same time.

    Now the thread performing the FLUSH LOGS takes a lock on the relay log before actually flushing it. (Bug #53657)

    References: See also Bug #50364.

  • Replication: Two related issues involving temporary tables and transactions were introduced by a fix made in MySQL 5.1.37:

    1. When a temporary table was created or dropped within a transaction, any failed statement that following the CREATE TEMPORARY TABLE or DROP TEMPORARY TABLE statement triggered a rollback, which caused the slave to diverge from the master.

    2. When a CREATE TEMPORARY TABLE ... SELECT * FROM ... statement was executed within a transaction in which only tables using transactional storage engines were used and the transaction was rolled back at the end, the changes—including the creation of the temporary table—were not written to the binary log.

    The current fix restores the correct behavior in both of these cases. (Bug #53560)

    References: This bug was introduced by Bug #43929.

  • Replication: When CURRENT_USER() or CURRENT_USER was used to supply the name and host of the affected user or of the definer in any of the statements DROP USER, RENAME USER, GRANT, REVOKE, and ALTER EVENT, the reference to CURRENT_USER() or CURRENT_USER was not expanded when written to the binary log. This resulted in CURRENT_USER() or CURRENT_USER being expanded to the user and host of the slave SQL thread on the slave, thus breaking replication. Now CURRENT_USER() and CURRENT_USER are expanded prior to being written to the binary log in such cases, so that the correct user and host are referenced on both the master and the slave. (Bug #48321)

  • A signal-handler redefinition for SIGUSR1 was removed. The redefinition could cause the server to encounter a kernel deadlock on Solaris when there are many active threads. Other POSIX platforms might also be affected. (Bug #54667)

  • The make_binary_distribution target to make could fail on some platforms because the lines generated were too long for the shell. (Bug #54590)

  • The server failed to disregard sort order for some zero-length tuples, leading to an assertion failure. (Bug #54459)

  • The default value of myisam_max_extra_sort_file_size could be higher than the maximum accepted value, leading to warnings upon the server start. (Bug #54457)

  • Inconsistent checking of the relationship between SHOW statements and INFORMATION_SCHEMA queries caused such queries to fail sometimes. (Bug #54422)

  • If a session tried to drop a database containing a table opened with HANDLER in another session, any DATABASE statement (CREATE, DROP, ALTER) executed by that session produced a deadlock. (Bug #54360)

  • Builds of the embedded mysqld failed due to a missing element of the struct NET. (Bug #53908, Bug #53912)

  • The definition of the MY_INIT macro in my_sys.h included an extraneous semicolon, which could cause compilation failure. (Bug #53906)

  • A client with automatic reconnection enabled saw the error message Lost connection to MySQL server during query if the connection was lost between the mysql_stmt_prepare() and mysql_stmt_execute() C API functions. However, mysql_stmt_errno() returned 0, not the corresponding error number 2013. (Bug #53899)

  • Queries that used MIN() or MAX() on indexed columns could be optimized incorrectly. (Bug #53859)

  • The Lock_time value in the slow query log was negative for stored routines. (Bug #53191)

  • The results of some ORDER BY ... DESC queries were sorted incorrectly. (Bug #51431)

  • Index Merge between three indexes could return incorrect results. (Bug #50389)

  • The server could crash with an out of memory error when trying to parse a query that was too long to fit in memory. Now the parser rejects such queries with an ER_OUT_OF_RESOURCES error. (Bug #42064)

  • Sort-index_merge for join tables other than the first table used excessive memory. (Bug #41660)

  • Valgrind warnings in the InnoDB compare_record() function were corrected. (Bug #38999)

  • mysqld could fail during execution when using SSL. (Bug #34236)

  • The behavior of the RPM upgrade installation has changed. During an upgrade installation using the RPM packages, if the MySQL server is running when the upgrade occurs, the server is stopped, the upgrade occurs, and server is restarted. If the server is not already running when the RPM upgrade occurs, the server is not started at the end of the upgrade. The boot scripts for MySQL are installed in the appropriate directories in /etc, so the MySQL server will be restarted automatically at the next machine reboot. (Bug #27072)

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