This is a bugfix release for the current MySQL Community Server production release family. It replaces MySQL 5.0.67.
Functionality Added or Changed
To enable stricter control over the location from which
user-defined functions can be loaded, the
plugin_dir system variable has
been backported from MySQL 5.1. If the value is nonempty,
user-defined function object files can be loaded only from the
directory named by this variable. If the value is empty, the
behavior that is used prior to the inclusion of
plugin_dir applies: The UDF
object files must be located in a directory that is searched by
your system's dynamic linker.
If the plugin directory is writable by the server, it may be
possible for a user to write executable code to a file in the
... INTO DUMPFILE. This can be prevented by making
plugin_dir read only to the
server or by setting
--secure-file-priv to a directory
SELECT writes can be made
Previously, index hints did not work for
FULLTEXT searches. Now they work as follows:
For natural language mode searches, index hints are silently
ignored. For example,
IGNORE INDEX(i) is
ignored with no warning and the index is still used.
For boolean mode searches, index hints are honored. (Bug #38842)
Security Fix; Important Change: Additional corrections were made for the symlink-related privilege problem originally addressed in MySQL 5.0.60. The original fix did not correctly handle the data directory path name if it contained symlinked directories in its path, and the check was made only at table-creation time, not at table-opening time later. (Bug #32167, CVE-2008-2079)
References: See also Bug #39277.
The server consumed excess memory while parsing statements with
hundreds or thousands of nested boolean conditions (such as
OR (OR ... (OR ... ))). This could lead to a
server crash or incorrect statement execution, or cause other
client statements to fail due to lack of memory. The latter
result constitutes a denial of service.
There were some problems using
hook functions on Windows that automatically do global and
per-thread initialization for
Per-thread initialization: MySQL internally counts the
number of active threads, which causes a delay in
my_end() if not all threads have
exited. But there are threads that can be started either by
Windows internally (often in TCP/IP scenarios) or by users.
Those threads do not necessarily use
libmysql.dll functionality but still
contribute to the open-thread count. (One symptom is a
five-second delay in times for PHP scripts to finish.)
WSAStartup that itself loads DLLs and
can lead to a deadlock in the Windows loader.
To correct these problems, DLL initialization code now is not
libmysql.dll by default. To
obtain the previous behavior (DLL initialization code will be
called), set the
variable to any value. This variable exists only to prevent
breakage of existing Windows-only applications that do not call
mysql_thread_init() and work
okay today. Use of
discouraged and is removed in MySQL 6.0.
(Bug #37226, Bug #33031)
SHOW STATUS took a lot of CPU
time for calculating the value of the
status variable. Now this variable is calculated and included in
the output of
SHOW STATUS only if
UNIV_DEBUG symbol is defined at MySQL
In connection with view creation, the server created
arc directories inside database directories
and maintained useless copies of
there. Creation and renaming procedures of those copies as well
as creation of
arc directories has been
This change does cause a problem when downgrading to older server versions which manifests itself under these circumstances:
Create a view
v_orig in MySQL 5.0.72 or
Rename the view to
v_new and then back to
Downgrade to an older 5.0.x server and run mysql_upgrade.
Try to rename
v_new again. This operation fails.
As a workaround to avoid this problem, use either of these approaches:
Dump your data using mysqldump before downgrading and reload the dump file after downgrading.
Instead of renaming a view after the downgrade, drop it and recreate it.
The downgrade problem introduced by the fix for this bug has been addressed as Bug #40021. (Bug #17823)
max_length result set metadata value was
calculated incorrectly under some circumstances.
Dumping information about locks in use by sending a
SIGHUP signal to the server or by invoking
the mysqladmin debug command could lead to a
server crash in debug builds or to undefined behavior in
A server crash or Valgrind warnings could result when a stored procedure selected from a view that referenced a function. (Bug #38291)
When the fractional part in a multiplication of
DECIMAL values overflowed, the
server truncated the first operand rather than the longest. Now
the server truncates so as to produce more precise
MyISAM table with
ROW_FORMAT = DYNAMIC table
options, a data consistency check (maximum record length) could
fail and cause the table to be marked as corrupted.
Incorrect handling of aggregate functions when loose index scan was used caused a server crash. (Bug #38195)
If a table has a
BIT NOT NULL column
c1 with a length shorter than 8 bits and some
NOT NULL columns
c2, ..., and a
SELECT query has a
WHERE clause of the form
query could return an unexpected result set.
constant) AND c2 ...
Queries of the form
SELECT ... REGEXP BINARY
NULL could lead to a hung or crashed server.
TABLE ... SELECT statements, where the created table
AUTO_INCREMENT column, could
lead to an assertion failure.
Statements of the form
INSERT ... SELECT .. ON
DUPLICATE KEY UPDATE could result in a server crash.
Changes to build files were made to enable the MySQL distribution to compile on Microsoft Visual C++ Express 2008. (Bug #33907)
A query which had an
ORDER BY DESC clause
that is satisfied with a reverse range scan could cause a server
crash for some specific CPU/compiler combinations.
TIMESTAMP column in an
InnoDB table, testing the column with
multiple conditions in the
caused a server crash.
Dynamic plugins failed to load on i5/OS. (Bug #35743)
A server crash resulted from concurrent execution of a
UPDATE that used a
TABLES WITH READ LOCK or
TABLE for the table being updated.
Column names constructed due to wild-card expansion done inside a stored procedure could point to freed memory if the expansion was performed after the first call to the stored procedure. (Bug #38823)
Stored procedures involving substrings could crash the server on certain platforms due to invalid memory reads. (Bug #38469)
The server crashed if an argument to a stored procedure was a subquery that returned more than one row. (Bug #37949)
References to local variables in stored procedures are replaced
NAME_CONST( when written to the
binary log. However, an “illegal mix of collation”
error might occur when executing the log contents if the value's
collation differed from that of the variable. Now information
about the variable collation is written as well.
mysql_install_db failed on machines that had
the host name set to
On ActiveState Perl, mysql-test-run.pl --start-and-exit started but did not exit. (Bug #38629)
Host name values in SQL statements were not being checked for
'@', which is illegal according to RFC952.
When analyzing the possible index use cases, the server was incorrectly reusing an internal structure, leading to a server crash. (Bug #37943)
mc.exe is no longer needed to compile MySQL on Windows. This makes it possible to build MySQL from source using Visual Studio Express 2008. (Bug #40280)
The server could crash during a sort-order optimization of a dependent subquery. (Bug #39844)
The server returned a column type of
VARBINARY rather than
DATE as the result from the
LEAST() functions or
CASE expression if the result was
filesort in an anonymous
temporary table during the query execution.
If delayed insert failed to upgrade the lock, it did not free
the temporary memory storage used to keep newly constructed
BLOB values in memory, resulting
in a memory leak.
On a 32-bit server built without big tables support, the offset
argument in a
LIMIT clause might be truncated
due to a 64-bit to 32-bit cast.
SELECT with a
IN condition containing a complex subquery from the
same table as in the outer select caused an assertion failure.
Some recent releases for Solaris 10 were built on Solaris 10 U5,
which included a new version of
that does not work on U4 or earlier. To correct this, Solaris 10
builds now are created on machines that do not have that
libnsl.so, so that they will work
on Solaris 10 installations both with and without the upgraded
UUID() function returned
UUIDs with the wrong time; this was because the offset for the
time part in UUIDs was miscalculated.
DROP failed if the name of the column to be dropped
began with “foreign”.
If the server crashed with an
due to unavailability of undo slots, errors could persist during
rollback when the server was restarted: There are two
UNDO slot caches (for
UPDATE). If all slots end up in
one of the slot caches, a request for a slot from the other slot
cache failed. This can happen if the request is for an
UPDATE slot and all slots are in
INSERT slot cache, or vice
Freeing of an internal parser stack during parsing of complex stored programs caused a server crash. (Bug #35577, Bug #37269, Bug #37228)
ORDER BY ...
DESC sometimes returned results in ascending order.
Index scans performed with the
access method returned wrong results, caused memory to be
leaked, and caused temporary files to be deleted when the limit
(Bug #35477, Bug #35478)
Cached queries that used 256 or more tables were not properly
cached, so that later query invalidation due to a
TRUNCATE TABLE for one of the
tables caused the server to hang.
If the server failed to expire binary log files at startup, it could crash. (Bug #37027)
mysql_install_db failed if the server was
running with an SQL mode of
TRADITIONAL. This program now
resets the SQL mode internally to avoid this problem.
Server-side cursors were not initialized properly, which could cause a server crash. (Bug #38486)
OPTIMIZE TABLE as the first
statement on an
InnoDB table with an
AUTO_INCREMENT column could cause a server
Queries containing a subquery with
ORDER BY could cause a server crash.
Queries of the form
SELECT ... WHERE
when the server used a single-byte character set and the client
used a multibyte character set.
string = ANY(...)
References: See also Bug #20835.
CHECK TABLE ... FOR
UPGRADE did not check for incompatible collation
changes made in MySQL 5.0.48 (Bug #27562, Bug #29461, Bug
#29499). This also affects mysqlcheck and
mysql_upgrade, which cause that statement to
be executed. See
Checking Whether Tables or Indexes Must Be Rebuilt.
References: See also Bug #39585.
Support for the
revision field in
.frm files has been removed. This addresses
the downgrading problem introduced by the fix for Bug #17823.
Queries with a
HAVING clause could return a
For a stored procedure containing a
SELECT * ... RIGHT
JOIN query, execution failed for the second call.
With binary logging enabled
VIEW was subject to possible buffer overwrite and a
The mysql client, when built with Visual Studio 2005, did not display Japanese characters. (Bug #36279)
perror on Windows did not know about Win32 system error codes. (Bug #34825)
Statements that displayed the value of system variables (for
SHOW VARIABLES) expect
variable values to be encoded in
variables set from the command line such as
datadir were encoded using
not converted correctly.
SQL mode enabled, the check for nonaggregated columns in queries
with aggregate functions, but without a
BY clause was treating all the parts of the query as
if they were in the select list. This is fixed by ignoring the
nonaggregated columns in the
FEDERATED handler had a memory
Prepared statements permitted invalid dates to be inserted when
mode was not enabled.
References: See also Bug #42525.
TABLES to get the list of tables in a database. For
some problems, such as an empty
for a table, this failed and mysqlcheck then
would neglect to check other tables in the database.
Updating a view with a subquery in the
option could cause an assertion failure.
Previously, use of index hints with views (which do not have indexes) produced the error ERROR 1221 (HY000): Incorrect usage of USE/IGNORE INDEX and VIEW. Now this produces ERROR 1176 (HY000): Key '...' doesn't exist in table '...', the same error as for base tables without an appropriate index. (Bug #33461)
CREATE INDEX could crash with
InnoDB plugin 1.0.1.
If the operating system is configured to return leap seconds
from OS time calls or if the MySQL server uses a time zone
definition that has leap seconds, functions such as
NOW() could return a value having
a time part that ends with
:59:61. If such values are inserted into a
table, they would be dumped as is by
mysqldump but considered invalid when
reloaded, leading to backup/restore problems.
Now leap second values are returned with a time part that ends
:59:59. This means that a function such
NOW() can return the same
value for two or three consecutive seconds during the leap
second. It remains true that literal temporal values having a
time part that ends with
:59:61 are considered invalid.
For additional details about leap-second handling, see Time Zone Leap Second Support. (Bug #39920)
Several MySQL programs could fail if the
environment variable had an empty value.
The BUILD/check-cpu build script failed if gcc had a different name (such as gcc.real on Debian). (Bug #27526)
mysqldump could fail to dump views containing a large number of columns. (Bug #31434)
mysqld_safe would sometimes fail to remove
the pid file for the old
mysql process after
a crash. As a result, the server failed to start due to a false
A mysqld process already exists... error.
Questions status variable
is intended as a count of statements sent by clients to the
server, but was also counting statements executed within stored
For access to the
INFORMATION_SCHEMA.VIEWS table, the
server did not check the
privileges, leading to inconsistency between output from that
table and the
SHOW CREATE VIEW
XA transaction rollbacks could result in corrupted transaction states and a server crash. (Bug #28323)
In some cases, the parser interpreted the
character as the end of input and misinterpreted stored program
The Serbian translation for the
error was corrected.
PRIVILEGES statement did not produce an error when it
mysql_upgrade attempted to use the
/proc file system even on systems that do
not have it.
On NetWare, mysql_install_db could appear to execute normally even if it failed to create the initial databases. (Bug #30129)
A race condition between the mysqld.exe server and the Windows service manager could lead to inability to stop the server from the service manager. (Bug #20430)
Some division operations produced a result with incorrect precision. (Bug #31616)