MySQL 5.7 changed audit log file output to a new format that has better compatibility with Oracle Audit Vault. This format has been backported to MySQL 5.5 and it is possible to select either the old or new format using the new
audit_log_formatsystem variable, which has permitted values of
OLD). For details about each format, see The Audit Log File.
In addition, when the audit log plugin rotates the audit log file, it uses a different file name format. For a log file named
audit.log, the plugin previously renamed the file to
audit.log.. The plugin now renames the file to
audit.log.to indicate that it is an XML file.
If you change the value of
audit_log_format, use this procedure to avoid writing log entries in one format to an existing log file that contains entries in a different format:
Stop the server.
Rename the current audit log file manually.
Restart the server with the new value of
audit_log_format. The audit log plugin will create a new log file, which will contain log entries in the selected format.
The API for writing audit plugins has also changed. The
mysql_event_generalstructure has new members to represent client host name and IP address, command class, and external user. For more information, see Writing Audit Plugins.
InnoDB; Partitioning: Following any query on the
InnoDBindex statistics as shown in the output of statements such as
INFORMATION_SCHEMA.STATISTICSwere read from the last partition, instead of from the partition containing the greatest number of rows. (Bug #11766851, Bug #60071)
References: See also: Bug #16882435, Bug #69179.
row_sel_sec_rec_is_for_clust_recfunction would incorrectly prepare to compare a NULL column prefix in a secondary index with a non-NULL column in a clustered index. (Bug #17312846)
InnoDB: An incorrect purge would occur when rolling back an update to a delete-marked record. (Bug #17302896)
InnoDBwould rename a user-defined foreign key constraint containing the string “_ibfk_” in its name, resulting in a duplicate constraint. (Bug #17076737, Bug #69693, Bug #17076718, Bug #69707)
InnoDB: Rolling back an
INSERTafter a failed
BLOBwrite would result in an assertion failure. The assertion has been modified to allow NULL
BLOBpointers if an error occurs during a
BLOBwrite. (Bug #16971045)
InnoDB: A regression introduced with the fix for Bug #11762038 would cause
InnoDBto raise an incorrect error message. The message stated that, “InnoDB cannot delete/update rows with cascading foreign key constraints that exceed max depth of 20”. The error message would occur when killing connections reading from
InnoDBtables that did not have foreign key constraints. (Bug #16710923)
References: This issue is a regression of: Bug #11762038.
InnoDB: The documentation incorrectly stated that
START TRANSACTION WITH CONSISTENT SNAPSHOTprovides a consistent snapshot only if the current isolation level is
START TRANSACTION WITH CONSISTENT SNAPSHOTonly works with
REPEATABLE READ. All other isolation levels are ignored. The documentation has been revised and a warning is now generated whenever the
WITH CONSISTENT SNAPSHOTclause is ignored. (Bug #14017206, Bug #65146)
srv_master_threadbackground thread, which monitors server activity and performs activities such as page flushing when the server is inactive or in a shutdown state, runs on a one second delay loop.
srv_master_threadfailed to check if the server is in a shutdown state before sleeping. (Bug #13417564, Bug #63276)
InnoDB: An infinite loop could occur in
buf_page_get_genwhen handling compressed-only pages. (Bug #12560151, Bug #61132)
Partitioning: Creating a table
CREATE TABLE ... PARTITION BY LIST ... PARTITION ... VALUES IN (NULL), then attempting to execute
CREATE TABLE ... LIKE t1caused the server to fail. (Bug #16860588)
Replication: A slave using row-based replication was unable to read the rows containing columns of type
MYSQL_TYPE_DECIMALproperly (old-style decimal, used prior to MySQL 5.0.3). Now the slave throws an error if it receives this type of data. You can convert the old-style
DECIMALformat to the binary format used in current MySQL releases with
ALTER TABLE; see Upgrading from MySQL 4.1 to 5.0, for more information. (Bug #16416302)
DROP TEMP TABLE IF EXISTSstatements could lead to failures in applying the binary log during point-in-time recovery operations. This is due to the fact that, when using row-based replication, the server appends
IF EXISTSto any
DROP TEMPORARY TABLEstatements written to the binary log, and that the slave SQL thread does not check * wildcard filter rules for
DROP TEMPORARY TABLE IF EXISTS. If
--log-slave-updateswas also enabled on the slave, such a statement was preceded by a
USEstatement. If the database referred by the
USEstatement did not exist, the statement failed, and stopped replication.
Now, when writing
DROP TEMPORARY TABLE IF EXISTSinto the binary log, no
USEstatement is written, and the table name in the
DROP TEMPORARY TABLEstatement is a fully qualified table name. (Bug #16290902)
References: This issue is a regression of: Bug #14188793.
Within a stored program, comparison of the value of a scalar subquery with an
INclause resulted in an error for the first execution and raised an assertion for the second execution. (Bug #17029399)
my_strtoll10()function could incorrectly convert some long string-format numbers to numeric values and fail to set the overflow flag. (Bug #16997513)
A race condition in the thread pool plugin could cause status variables such as
Aborted_connectsnot to be incremented and permitting concurrent kills to happen for the same thread ID. (Bug #16959022)
Within a stored procedure, repeated execution of a prepared
CREATE TABLEstatement for a table with partitions could cause a server exit. (Bug #16614004)
Deadlocks involving metadata locks and
InnoDBdeadlocks were both reported as an
ER_LOCK_DEADLOCKerror, but only
InnoDBdeadlocks rolled back the transaction. Now both deadlocks roll back the transaction. (Bug #14188793)
For queries that accessed an
INFORMATION_SCHEMAtable in a subquery, an attempt to lock a mutex that had already been locked could cause a server crash. (Bug #11765744)
RPM packages did not provide lowercase tags for their contents. For example, a server RPM indicated that it provided
MySQL-server, but not
mysql-server. (Bug #69830, Bug #17211588)
InnoDBdeadlock caused transaction rollback but did not release metadata locks, blocking concurrent DDL on the transaction tables until the connection that got the deadlock issued an explicit
ROLLBACK. (Bug #69668, Bug #17054007)
For failure to create a new thread for the event scheduler, event execution, or new connection, no message was written to the error log. This could lead to the impression that the event scheduler was running normally when it was not. (Bug #67191, Bug #14749800, Bug #16865959)
If one connection changed its default database and simultaneously another connection executed
SHOW PROCESSLIST, the second connection could access invalid memory when attempting to display the first connection's default database. memory. (Bug #58198, Bug #11765252)