MyISAM tables with
larger than 256KB, the performance of bulk insert operations
such as multiple-row
SELECT operations has been improved greatly when up to
a hundred rows are inserted at the same time.
SELECT statement on an empty partition of a
partitioned table failed with ERROR 1030 (HY000): Got
error 124 from storage engine. This issue also
caused queries run against a partitioned table while a
LOAD DATA CONCURRENT
INFILE statement was in progress to fail with the same
References: See also Bug #35845, Bug #44657, Bug #45840.
A partitioned table having a
TIMESTAMP column with a default
CURRENT_TIMESTAMP and this column
was not defined using an
ON UPDATE option, an
ALTER TABLE ...
REORGANIZE PARTITION statement on the table caused the
TIMESTAMP column value to be set
Partition pruning did not always work correctly when the
table's partitioning key used the
Partitioning: Attempting to access a partitioned table when partitioning support was disabled in a MySQL server binary that had been compiled with partitioning support caused the server to crash. (Bug #39893)
The use of
TO_DAYS() in the
partitioning expression led to selection failures when the
column having the date value contained invalid dates. This
occurred because the function returns
such cases, and the partition containing NULL values was pruned
away. For example, this problem occurred if
'2001-02-00' was inserted into a
DATE column of such a table, and
a subsequent query on this table used
'2001-01-01' is less than
TO_DAYS('2001-02-00') evaluates as
NULL, and so the row containing
'2001-01-01' was not returned. Now, for
partitioning and having
in the partitioning expression, the
partition is also scanned instead of being ignored.
The fix for this issue also corrects misbehavior such that a
query of the form
SELECT * FROM
on a table
LIST was handled as though the server SQL
ALLOW_INVALID_DATES even if
this was not actually part of the server SQL mode at the time
the query was issued.
References: See also Bug #18198, Bug #32021, Bug #46362.
Performing a multi-row update of the
AUTO_INCREMENT column of a transactional
table could result in an inconsistency between master and slave
when there was a trigger on the transactional table that updated
a nontransactional table. When such an update failed on the
master, no rows were updated on the master, but some rows could
(erroneously) be updated on the slave.
When using the
--replicate-rewrite-db option and
the database referenced by this option on the master was the
current database when the connection to the slave was closed,
any temporary tables existing in this database were not properly
Replication: When a statement that changed both transactional and nontransactional tables failed, the transactional changes were automatically rolled back on the master but the slave ignored the error and did not roll them back, thus leading to inconsistencies between master and slave.
This issue is fixed by automatically rolling back a statement
that fails on the slave; however, the transaction is not rolled
back unless a corresponding
statement is found in the relay log file.
References: See also Bug #33864.
is set, a statement that replicates, but is then rolled back due
to a deadlock on the slave, should be retried. However, in
certain cases, replication was stopped with error 1213
(Deadlock found when trying to get lock; try
restarting transaction) instead, even when this
variable was set.
The binary logging behavior (and thus, the replication behavior)
DATABASE IF NOT EXISTS,
CREATE TABLE IF
NOT EXISTS, and
CREATE EVENT IF
NOT EXISTS was not consistent among these statements,
nor with that of
DROP DATABASE IF
DROP TABLE IF
DROP EVENT IF
DROP ... IF EXISTS
statement is always logged even if the database object named in
the statement does not exist. However, of the
... IF NOT EXISTS statements, only the
CREATE EVENT IF
NOT EXISTS statement was logged when the database
object named in the statement already existed.
CREATE ... IF NOT EXISTS statement
is written to the binary log (and thus replicated), whether the
database object named in the statement exists or not. For more
Replication of CREATE ... IF NOT EXISTS Statements.
Replication and logging of
CREATE TABLE IF
NOT EXISTS ... SELECT continues to be handled
according to existing rules. See
Replication of CREATE TABLE ... SELECT Statements, for more
When using statement-based replication, database-level character
sets were not always honored by the replication SQL thread. This
could cause data inserted on the master using
LOAD DATA to be replicated using
the wrong character set.
This was not an issue when using row-based replication.
In some cases, a
statement could cause the replication slave to crash. This issue
was specific to MySQL on Windows or Macintosh platforms.
(Bug #45238, Bug #45242, Bug #45243, Bug #46013, Bug #46014, Bug #46030)
References: See also Bug #40796.
Creating a scheduled event whose
clause was either set to
CURRENT_USER or not set
explicitly caused the master and the slave to become
inconsistent. This issue stems from the fact that, in both
DEFINER is set to the
CURRENT_USER of the current
thread. (On the master, the
CURRENT_USER is the
mysqld user; on the slave, the
CURRENT_USER is empty.)
This behavior has been modified as follows:
References: See also Bug #42217.
When using the statement-based logging format, the only possible
safe combination of transactional and nontransactional
statements within the same transaction is to perform any updates
on nontransactional tables (such as
MyISAM tables) first, before
updating any transactional tables (such as those using the
InnoDB storage engine). This is due
to the fact that, although a modification made to a
nontransactional table is immediately visible to other
connections, the update is not immediately written to the binary
log, which can lead to inconsistencies between master and slave.
(Other combinations may hide a causal dependency, thus making it
impossible to write statements updating nontransactional tables
to the binary log in the correct order.)
However, in some cases, this situation was not handled properly, and the determination whether a given statement was safe or not under these conditions was not always correct. In particular, a multi-table update that affected both transactional and nontransactional tables or a statement modifying data in a nontransactional table having a trigger that operated on a transactional table (or the reverse) was not determined to be unsafe when it should have been.
With this fix, the following determinations regarding replication safety are made when combining updates to transactional and nontransactional tables within the same transaction in statement-based logging mode:
Any statement modifying data in a nontransactional table within a given transaction is considered safe if it is issued prior to any data modification statement accessing a transactional table within the same transaction.
A statement that updates transactional tables only is always considered safe.
A statement affecting both transactional and
nontransactional tables within a transaction is always
considered unsafe. It is not necessary that both tables be
modified for this to be true; for example, a statement such
innodb_table SELECT * FROM
The current fix is valid only when using statement-based
logging mode; we plan to address similar issues occurring when
format in a future MySQL release.
Stack overflow checking did not account for the size of the structure stored in the heap. (Bug #46807)
The server could crash for queries with the following elements:
1. An “impossible where” in the outermost
SELECT; 2. An aggregate in the outermost
SELECT; 3. A correlated subquery with a
WHERE clause that includes an outer field
reference as a top-level
CREATE TABLE ...
SELECT could cause assertion failure if a table
already existed with the same name and contained an
In queries for which the loose index scan access method was
chosen, using a condition of the form
col_name rather than the equivalent
caused an assertion failure.
TRUNCATE TABLE for a table that
was opened with
HANDLER did not
close the handler and left it in an inconsistent state that
could lead to a server crash. Now
TABLE for a table closes all open handlers for the
A query containing a subquery in the
PROCEDURE ANALYSE() caused a
References: See also Bug #48293.
Killing a query that was performing a sort could result in a memory leak. (Bug #45962)
References: See also Bug #48370.
A buffer overflow could occur during handling of
mysqladmin --wait ping crashed on Windows systems. (Bug #35132)
Installation of MySQL on Windows failed to set the correct location for the character set files, which could lead to mysqld and mysql failing to initialize properly. (Bug #17270)