This is a bugfix release for the current MySQL Community Server production release family. It replaces MySQL 5.0.77.
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
A new status variable,
Queries, indicates the number
of statements executed by the server. This includes statements
executed within stored programs, unlike the
Questions variable which
includes only statements sent to the server by clients.
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)
Replication: When rotating relay log files, the slave deletes relay log files and then edits the relay log index file. Formerly, if the slave shut down unexpectedly between these two events, the relay log index file could then reference relay logs that no longer existed. Depending on the circumstances, this could when restarting the slave cause either a race condition or the failure of replication. (Bug #38826, Bug #39325)
In example option files provided in MySQL distributions, the
thread_stack value was
increased from 64K to 128K.
table was limited to 7680 rows.
In debug builds, obsolete debug code could be used to crash the server. (Bug #41041)
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.
Some queries that used a “range checked for each record” scan could return incorrect results. (Bug #40974)
References: See also Bug #44810.
SELECT queries could fail
Duplicate entry error.
FEDERATED handler had a memory
IF(..., CAST( as
an argument to an aggregate function could cause an assertion
Prepared statements permitted invalid dates to be inserted when
mode was not enabled.
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)
Support for the
revision field in
.frm files has been removed. This addresses
the downgrading problem introduced by the fix for Bug #17823.
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)
The server could crash during a sort-order optimization of a dependent subquery. (Bug #39844)
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
The server crashed if an integer field in a CSV file did not have delimiting quotation marks. (Bug #39616)
Creating a table with a comment of 62 characters or longer caused a server crash. (Bug #39591)
InnoDB could hang trying to open an adaptive
TIMESTAMP column in an
InnoDB table, testing the column with
multiple conditions in the
caused a server crash.
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.
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.
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
With binary logging enabled
VIEW was subject to possible buffer overwrite and a
Queries of the form
SELECT ... REGEXP BINARY
NULL could lead to a hung or crashed server.
Statements of the form
INSERT ... SELECT .. ON
DUPLICATE KEY UPDATE could result in a server crash.
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)
TABLE ... SELECT statements, where the created table
AUTO_INCREMENT column, could
lead to an assertion failure.
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.
A server crash resulted from concurrent execution of a
UPDATE that used a
TABLES WITH READ LOCK or
TABLE for the table being updated.
On ActiveState Perl, mysql-test-run.pl --start-and-exit started but did not exit. (Bug #38629)
Server-side cursors were not initialized properly, which could cause a server crash. (Bug #38486)
Stored procedures involving substrings could crash the server on certain platforms due to invalid memory reads. (Bug #38469)
A server crash or Valgrind warnings could result when a stored procedure selected from a view that referenced a function. (Bug #38291)
Incorrect handling of aggregate functions when loose index scan was used caused a server crash. (Bug #38195)
Queries containing a subquery with
ORDER BY could cause a server crash.
Queries with a
HAVING clause could return a
Use of spatial data types in prepared statements could cause memory leaks or server crashes. (Bug #37956, Bug #37671)
The server crashed if an argument to a stored procedure was a subquery that returned more than one row. (Bug #37949)
When analyzing the possible index use cases, the server was incorrectly reusing an internal structure, leading to a server crash. (Bug #37943)
SELECT with a
IN condition containing a complex subquery from the
same table as in the outer select caused an assertion failure.
ORDER BY ...
DESC sometimes returned results in ascending order.
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 ...
DAYNAME() functions returned a
binary string, so that using
UPPER() had no effect. Now
DAYNAME() return a value in
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.
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.
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.
max_length result set metadata value was
calculated incorrectly under some circumstances.
CREATE INDEX could crash with
InnoDB plugin 1.0.1.
FULLTEXT searches that
used the truncation operator did not return matching records and
calculated relevance incorrectly.
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.
If the server failed to expire binary log files at startup, it could crash. (Bug #37027)
The code for the
ut_usectime() function in
InnoDB did not handle errors from the
gettimeofday() system call. Now it retries
gettimeofday() several times and updates
the value of the
status variable only if
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.
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
The mysql client, when built with Visual Studio 2005, did not display Japanese characters. (Bug #36279)
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
A read past the end of the string could occur while parsing the
value of the
Host name values in SQL statements were not being checked for
'@', which is illegal according to RFC952.
UUID() function returned
UUIDs with the wrong time; this was because the offset for the
time part in UUIDs was miscalculated.
mysql_install_db failed on machines that had
the host name set to
Dynamic plugins failed to load on i5/OS. (Bug #35743)
Freeing of an internal parser stack during parsing of complex stored programs caused a server crash. (Bug #35577, Bug #37269, Bug #37228)
max_length metadata value was calculated
incorrectly for the
function, which could cause incorrect result set metadata to be
sent to clients.
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)
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
DROP failed if the name of the column to be dropped
began with “foreign”.
perror on Windows did not know about Win32 system error codes. (Bug #34825)
EXPLAIN EXTENDED evaluation of
aggregate functions that required a temporary table caused a
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.
OPTIMIZE TABLE as the first
statement on an
InnoDB table with an
AUTO_INCREMENT column could cause a server
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.
Changes to build files were made to enable the MySQL distribution to compile on Microsoft Visual C++ Express 2008. (Bug #33907)
The mysql client incorrectly parsed statements containing the word “delimiter” in mid-statement.
This fix is different from the one applied for this bug in MySQL 5.0.66. (Bug #33812)
References: See also Bug #38158.
For a stored procedure containing a
SELECT * ... RIGHT
JOIN query, execution failed for the second call.
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)
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.
Some division operations produced a result with incorrect precision. (Bug #31616)
mysql_upgrade attempted to use the
/proc file system even on systems that do
not have it.
mysqldump could fail to dump views containing a large number of columns. (Bug #31434)
Queries executed using join buffering of
BIT columns could produce
For installation on Solaris using pkgadd
packages, the mysql_install_db script was
generated in the
scripts directory, but the
temporary files used during the process were left there and not
Several MySQL programs could fail if the
environment variable had an empty value.
On NetWare, mysql_install_db could appear to execute normally even if it failed to create the initial databases. (Bug #30129)
The Serbian translation for the
error was corrected.
XA transaction rollbacks could result in corrupted transaction states and a server crash. (Bug #28323)
The BUILD/check-cpu build script failed if gcc had a different name (such as gcc.real on Debian). (Bug #27526)
SSL support was not included in some “generic” RPM packages. (Bug #26760)
In some cases, the parser interpreted the
character as the end of input and misinterpreted stored program
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
PRIVILEGES statement did not produce an error when it
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)
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.