Dear MySQL users, MySQL 5.5.29 is a new version of the 5.5 production release of the world's most popular open source database. MySQL 5.5.29 is recommended for use on production systems. MySQL 5.5 includes several high-impact enhancements to improve the performance and scalability of the MySQL Database, taking advantage of the latest multi-CPU and multi-core hardware and operating systems. In addition, with release 5.5, InnoDB is now the default storage engine for the MySQL Database, delivering ACID transactions, referential integrity and crash recovery by default. MySQL 5.5 also provides a number of additional enhancements including: - Significantly improved performance on Windows, with various Windows specific features and improvements - Higher availability, with new semi-synchronous replication and Replication Heartbeat - Improved usability, with Improved index and table partitioning, SIGNAL/RESIGNAL support and enhanced diagnostics, including a new Performance Schema monitoring capability. For a more complete look at what's new in MySQL 5.5, please see the following resources: MySQL 5.5 is GA, Interview with Tomas Ulin: http://dev.mysql.com/tech-resources/interviews/thomas-ulin-mysql-55.html Documentation: http://dev.mysql.com/doc/refman/5.5/en/mysql-nutshell.html Whitepaper: What's New in MySQL 5.5: http://dev.mysql.com/why-mysql/white-papers/mysql-wp-whatsnew-mysql-55.php If you are running a MySQL production level system, we would like to direct your attention to MySQL Enterprise Edition, which includes the most comprehensive set of MySQL production, backup, monitoring, modeling, development, and administration tools so businesses can achieve the highest levels of MySQL performance, security and uptime. http://mysql.com/products/enterprise/ For information on installing MySQL 5.5.29 on new servers, please see the MySQL installation documentation at http://dev.mysql.com/doc/refman/5.5/en/installing.html For upgrading from previous MySQL releases, please see the important upgrade considerations at: http://dev.mysql.com/doc/refman/5.5/en/upgrading.html MySQL Database 5.5.29 is available in source and binary form for a number of platforms from our download pages at: http://dev.mysql.com/downloads/mysql/ The following section lists the changes in the MySQL source code since the previous released version of MySQL 5.5. It may also be viewed online at: http://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-29.html Enjoy! Changes in MySQL 5.5.29 (21-December-2012) Functionality Added or Changed * The SHOW AUTHORS and SHOW CONTRIBUTORS statements are now deprecated in MySQL 5.5 and have been removed in MySQL 5.6. Bugs Fixed * Performance: InnoDB: The timing values for low-level InnoDB read operations were adjusted for better performance with fast storage devices, such as SSD (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_ssd ). This enhancement primarily affects read operations for BLOB columns in compressed (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_com pression) tables. (Bug #13702112, Bug #64258) * Important Change: InnoDB: A DML (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_dml ) statement using the index merge access method could lock many rows from the table, even when those rows were not part of the final result set. This fix reduces the excessive locking (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_loc king) by releasing the locks of unmatched rows. This optimization affects only transactions with isolation level equal to or less strict than READ COMMITTED; it does not apply to transactions using REPEATABLE READ or SERIALIZABLE isolation level. (Bug #14226171) * InnoDB: An online DDL operation for an InnoDB table incorrectly reported an empty value ('') instead of the correct key value when it reported a duplicate key error for a unique index using an index prefix. (Bug #14729221) * InnoDB: If a CREATE TABLE statement failed due to a disk full error, some memory allocated during the operation was not freed properly. (Bug #14708715) * InnoDB: With the innodb_file_per_table setting enabled, a DROP TABLE operation could cause a crash, due to a race condition that depended on the timing of pending I/O requests. (Bug #14594600, Bug #66718) * InnoDB: If the server crashed at the specific point when a change buffer (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_cha nge_buffer) entry was being merged into a buffer pool page, the transaction log and the change buffer were left in an inconsistent state. After a restart, MySQL could crash after reading the corresponding secondary index page. The problem was more likely to occur in MySQL 5.5 or later, where the original insert buffering (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_ins ert_buffering) mechanism was generalized to cover other operations. (Bug #14636528, Bug #66819, Bug #58571, Bug #61104, Bug #65443) * InnoDB: Inserting data of varying record lengths into an InnoDB table that used compression (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_com pression) could cause the server to halt with an error. (Bug #14554000, Bug #13523839, Bug #63815, Bug #12845774, Bug #61456, Bug #12595091, Bug #61208) * InnoDB: If a table was defined with an index key length very close to the upper length limit of 3072, a query against that table could cause a serious error. (Bug #14500557, Bug #66413) * InnoDB: When an auto-increment column used a FLOAT or DOUBLE data type, if the auto-increment value became very large (larger than the maximum unsigned long long value), subsequent inserts could fail or cause the server to halt. (Bug #14145950, Bug #55071) * InnoDB: If a transaction was started with a consistent snapshot, then new indexes were added to the table while the transaction was in progress, a subsequent UPDATE statement could incorrectly encounter the error: HA_ERR_TABLE_DEF_CHANGED: insufficient history for index This issue could cause an assertion error in debug builds. (Bug #14036214) * InnoDB: The error message was improved for the case where an UPDATE failed because the row included several BLOB values greater than 768 bytes each, causing the size of a row to exceed half the page size (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_pag e_size). The old message, was misleading; it suggested using BLOBs, when the 768-byte prefix for each BLOB column was the cause of the limit error: Error Code 1118: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. You have to change some columns to TEXT or BLOBs A workaround for the problem was to create the table with the ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED clause, which is now suggested in the message. (Bug #13453036, Bug #63507) * InnoDB: In rare circumstances, MySQL could apply InnoDB undo (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_und o) records out of order during a ROLLBACK (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_rol lback) of an operation that modified a BLOB column. This issue could cause an assertion error in debug builds: !bpage->file_page_was_freed (Bug #13249921) * Replication: Updates writing user variables whose values were never set on a slave while using --replicate-ignore-table could cause the slave to fail. (Bug #14597605) References: This bug was introduced by Bug #14275000. * Replication: Backtick (`) characters were not always handled correctly in internally generated SQL statements, which could sometimes lead to errors on the slave. (Bug #14548159) * Replication: Following an insert into a nontransactional table that failed due to insufficient disk space, the server did not properly clean up all pending events, leading to an assert or possibly to other errors. (Bug #11750014) * Very long database names in queries could cause the server to exit. (Bug #15912213) * Within a stored procedure, executing a multiple-table DELETE statement that used a very long table alias could cause the server to exit. (Bug #15954896) * Very long table aliases in queries could cause the server to exit. (Bug #15948123) * Attempting to create an auto-increment (http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_aut o_increment) column in an InnoDB table with a NULL type attribute could cause a serious error. (Bug #14758479) * A DELETE statement for an InnoDB table could write incorrect transaction metadata into a record, causing the server to halt with an error. To work around this issue, reduce the specified length of the primary key to less than 1K bytes. (Bug #14731482) * Repeated execution of a query containing a subquery that used MAX() could result in increasing memory consumption. (Bug #14683676) * USE dbname could fail with Unknown database when dbname contained multiple backtick (`) characters. (Bug #14645196) * The configure.pl script that converts GNU configure options to CMake equivalents generated erroneous output for the --with-client-ldflags and --with-mysqld-ldflags options. It now ignores those options. (Bug #14593123) * SHOW PROFILE could be used to cause excessive server memory consumption. (Bug #14629232) * The thread cache implementation worked in LIFO rather than FIFO fashion and could result in a thread being denied service (although this was a remote possibility). (Bug #14621627) * Within a stored program, memory allocated to hold condition information was not released until program exit, leading to excessive memory use. (Bug #14640599) * Improper memory cleanup could cause the server to exit. (Bug #14536113) * Granting or revoking the PROXY privilege caused the server to exit if the server was started with --skip-name-resolve. (Bug #14211140) * CREATE USER and DROP USER could fail to flush the privileges, requiring FLUSH PRIVILEGES to be used explicitly. (Bug #13864642) * Access to INFORMATION_SCHEMA tables through a view could leak memory. (Bug #13734987) * A memory leak could occur for queries containing a subquery that used GROUP BY on an outer column. (Bug #13724099) * On Microsoft Windows with CMake 2.6, the build process would not stop if the create_initial_db step failed. (Bug #13713525) * The test in mysqld_safe for the presence of the --plugin_dir option and assignment of a default value to it were performed before the actual argument parsing took place. (Bug #13548161) * CHECK TABLE and REPAIR TABLE could crash if a MyISAM table had a corrupt key (.MYI) file. Now the server produces an error. (Bug #13556441) * Improper memory cleanup could cause the server to exit. (Bug #13340270) * A memory leak occurred due to failure to clean up after QUICK_INDEX_MERGE_SELECT/Unique. (Bug #12694872, Bug #14542543) * The number of connection errors from a given host as counted by the server was periodically reset, with the result that max_connect_errors was never reached and invalid hosts were never blocked from trying to connect. (Bug #11753779) References: See also Bug #38247, Bug #43006, Bug #45584, Bug #45606. * During optimization, ZEROFILL values may be converted to string constants. However, CASE expressions did not handle switching data types after the planning stage, leading to CASE finding a null pointer instead of its argument. (Bug #57135, Bug #11764313) * In debug builds, an InnoDB assertion was overly aggressive about prohibiting an open range. (Bug #66513, Bug #14547952) * On Windows, the Perl version of mysql_install_db created system tables in the mysql database that were not populated properly. (Bug #65584, Bug #14181049) * mysqld_safe ignored the value of the UMASK environment variable, leading to behavior different from mysqld with respect to the access mode of created files. Now mysqld_safe (and mysqld_multi) attempt to approximate the same behavior as mysqld. (Bug #57406, Bug #11764559) * LAST_INSERT_ID(expr) did not work for expr values greater than the largest signed BIGINT value. (Bug #20964, Bug #11745891) On behalf of the MySQL/ORACLE Build Team Hery Ramilison
|MySQL Community Server 5.5.29 has been released||3256||Jocelyn Ramilison||12/21/2012 02:29PM|
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