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Changes in MySQL 5.6.43: Functionality Added or Changed Microsoft Windows: The access control granted to clients on the named pipe created by the MySQL server now is set to the minimum necessary for successful communication on Windows. Newer MySQL client software can open named pipe connections without any additional configuration. If older client software cannot be upgraded immediately, the new named_pipe_full_access_group server system variable can be used to give a Windows group the necessary permissions to open a named pipe connection. Membership in the full-access group should be restricted and temporary. Bugs Fixed Replication: A patch to correct the handling of quotes for identifiers in ROLLBACK TO SAVEPOINT statements in the binary log was not correctly applied to subsequent MySQL versions. Replication: In some circumstances, the CHANGE MASTER TO statement could not be used on a replication slave if the master info log had been changed from a table (master_info_repository=TABLE) into a file (master_info_repository=FILE). Replication: The value returned by a SHOW SLAVE STATUS statement for the total combined size of all existing relay log files (Relay_Log_Space) could become much larger than the actual disk space used by the relay log files. The I/O thread did not lock the variable while it updated the value, so the SQL thread could automatically delete a relay log file and write a reduced value before the I/O thread finished updating the value. The I/O thread then wrote its original size calculation, ignoring the SQL thread's update and so adding back the space for the deleted file. The Relay_Log_Space value is now locked during updates to prevent concurrent updates and ensure an accurate calculation. Replication: If the relay log index file was temporarily locked for viewing by a backup process for a replication slave, and MySQL Server also attempted to access the file at that time for rename or delete operations, the backup completed with warnings, but MySQL Server experienced an unexpected halt. MySQL Server now retries the file access operation a number of times in case this or a similar scenario is the explanation and the file becomes available again before long. The server permitted creation of databases with the same name as redo log files, which could result in unexpected server behavior. Such names are no longer permitted as database names. When a subquery contained a UNION, the count of the number of subquery columns was calculated incorrectly. Comparing log file names as strings using the memcmp() function resulted in uninitialized memory read errors. The comparison now uses the strncmp() function. Thanks to Zsolt Parragi and Laurynas Biveinis for their contributions. The transformation of IN subquery predicates into semijoins was not handled correctly for a very large number of tables. Executing a prepared statement to do a multiple-row insert with large number of placeholders consumed excessive memory and could execute slowly. The parser accepted invalid SET statement syntax in trigger definitions that could result in a server exit. MyISAM index corruption could occur for bulk-insert and table-repair operations that involve the repair-by-sorting algorithm and many (more than 450 million) rows. A query employing a dynamic range and an index merge could use more memory than expected. |
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