オリジナル版：http://dev.mysql.com/doc/refman/5.1/en/news-5-1-44.html
最も普及しているオープンソースデータベース管理システムの新バージョンであるMySQL Community Server 5.1.44がリリースされました。MySQL 5.1.44は、プロダクションシステムでの使用をお勧めします。
MySQL 5.1の新機能の概要については、以下を参照してください。
http://dev.mysql.com/doc/refman/5.1/en/mysql-nutshell.html
新たなサーバにMySQL 5.1.44をインストール、または以前のMySQLリリースからMySQL 5.1.44にアップグレードする際の情報については、以下を参照してください。
http://dev.mysql.com/doc/refman/5.1/en/installing.html
MySQLサーバは、http://dev.mysql.com/downloads/から、ソースコード及び多数のプラットフォーム用バイナリが入手可能です。
現時点ですべてのミラーサイトが最新であるとは限らないことに注意してください。
あるミラーサイトで本バージョンを見つけることができない場合は、後日再確認を行うか、別のダウンロード・サイトを選択してください。
バグレポート、バグ修正、パッチ等の情報をお待ちしておりますので、以下のページをご利用ください。
http://forge.mysql.com/wiki/Contributing
MySQL 5.1に関するオープンな問題の情報については、以下のエラッタリストを参照してください。
http://dev.mysql.com/doc/refman/5.1/en/open-bugs.html
以下のセクションはMySQL5.1の前リリース以降のMySQLソースコードの変更を記載しています。これはオンラインでも閲覧可能です：
http://dev.mysql.com/doc/refman/5.1/en/news-5-1-44.html
以下は、追加または変更された機能です。
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C.1.2. Changes in MySQL 5.1.44
InnoDB Plugin Notes:
* This release includes InnoDB Plugin 1.0.6. This version is
considered of Release Candidate (RC) quality.
In this release, the InnoDB Plugin is included in source and
binary distributions, except RHEL3, RHEL4, SuSE 9 (x86,
x86_64, ia64), and generic Linux RPM packages. It also does
not work for FreeBSD 6 and HP-UX or for Linux on generic ia64.
Functionality added or changed:
* Replication: Introduced the
--binlog-direct-non-transactional-updates server option. This
option causes updates using the statement-based logging format
to tables using non-transactional engines to be written
directly to the binary log, rather than to the transaction
cache.
Before using this option, be certain that you have no
dependencies between transactional and non-transactional
tables. A statement that both selects from an InnoDB table and
inserts into a MyISAM table is an example of such a
dependency. For more information, see Section 16.1.3.4,
"Binary Log Options and Variables."
(Bug#46364: http://bugs.mysql.com/bug.php?id=46364)
See also Bug#28976: http://bugs.mysql.com/bug.php?id=28976,
Bug#40116: http://bugs.mysql.com/bug.php?id=40116.
Bugs fixed:
* Partitioning: When an ALTER TABLE ... REORGANIZE PARTITION
statement on an InnoDB table failed due to
innodb_lock_wait_timeout expiring while waiting for a lock,
InnoDB did not clean up any temporary files or tables which it
had created. Attempting to reissue the ALTER TABLE statement
following the timeout could lead to storage engine errors, or
possibly a crash of the server.
(Bug#47343: http://bugs.mysql.com/bug.php?id=47343)
* Replication: In some cases, inserting into a table with many
columns could cause the binary log to become corrupted.
(Bug#50018: http://bugs.mysql.com/bug.php?id=50018)
See also Bug#42749: http://bugs.mysql.com/bug.php?id=42749.
* Replication: When using row-based replication, setting a BIT
or CHAR column of a MyISAM table to NULL, then trying to
delete from the table, caused the slave to fail with the error
Can't find record in table.
(Bug#49481: http://bugs.mysql.com/bug.php?id=49481,
Bug#49482: http://bugs.mysql.com/bug.php?id=49482)
* Replication: When logging in row-based mode, DDL statements
are actually logged as statements; however, statements that
affected temporary tables and followed DDL statements failed
to reset the binary log format to ROW, with the result that
these statements were logged using the statement-based format.
Now the state of binlog_format is restored after a DDL
statement has been written to the binary log.
(Bug#49132: http://bugs.mysql.com/bug.php?id=49132)
* Replication: When using row-based logging, the statement
CREATE TABLE t IF NOT EXIST ... SELECT was logged as CREATE
TEMPORARY TABLE t IF NOT EXIST ... SELECT when t already
existed as a temporary table. This was caused by the fact that
the temporary table was opened and the results of the SELECT
were inserted into it when a temporary table existed and had
the same name.
Now, when this statement is executed, t is created as a base
table, the results of the SELECT are inserted into it --- even
if there already exists a temporary table having the same name
--- and the statement is logged correctly.
(Bug#47418: http://bugs.mysql.com/bug.php?id=47418)
See also Bug#47442: http://bugs.mysql.com/bug.php?id=47442.
* Replication: Due to a change in the size of event
representations in the binary log, when replicating from a
MySQL 4.1 master to a slave running MySQL 5.0.60 or later, the
START SLAVE UNTIL statement did not function correctly,
stopping at the wrong position in the log. Now the slave
detects that the master is using the older version of the
binary log format, and corrects for the difference in event
size, so that the slave stops in the correct position.
(Bug#47142: http://bugs.mysql.com/bug.php?id=47142)
* The SSL certificates in the test suite were about to expire.
They have been updated with expiration dates in the year 2015.
(Bug#50642: http://bugs.mysql.com/bug.php?id=50642)
* The printstack function does not exist on Solaris 8 or
earlier, which would lead to a compilation failure.
(Bug#50409: http://bugs.mysql.com/bug.php?id=50409)
* A user could see tables in INFORMATION_SCHEMA.TABLES without
appropriate privileges for them.
(Bug#50276: http://bugs.mysql.com/bug.php?id=50276)
* Debug output for join structures was garbled.
(Bug#50271: http://bugs.mysql.com/bug.php?id=50271)
* The filesort sorting method applied to a CHAR(0) column could
lead to a server crash.
(Bug#49897: http://bugs.mysql.com/bug.php?id=49897)
* sql_buffer_result had an effect on non-SELECT statements,
contrary to the documentation.
(Bug#49552: http://bugs.mysql.com/bug.php?id=49552)
* In some cases a subquery need not be evaluated because it
returns only aggregate values that can be calculated from
table metadata. This sometimes was not handled by the
enclosing subquery, resulting in a server crash.
(Bug#49512: http://bugs.mysql.com/bug.php?id=49512)
* The method for comparing INFORMATION_SCHEMA names and database
names was nonoptimal and an improvement was made: When the
database name length is already known, a length check is made
first and content comparison skipped if the lengths are
unequal. (Bug#49501: http://bugs.mysql.com/bug.php?id=49501)
* The MD5() and SHA1() functions had excessive overhead for
short strings.
(Bug#49491: http://bugs.mysql.com/bug.php?id=49491)
* Mixing full-text searches and row expressions caused a crash.
(Bug#49445: http://bugs.mysql.com/bug.php?id=49445)
* Creating or dropping a table with 1023 transactions active
caused an assertion failure.
(Bug#49238: http://bugs.mysql.com/bug.php?id=49238)
* mysql-test-run.pl now recognizes the MTR_TESTCASE_TIMEOUT,
MTR_SUITE_TIMEOUT, MTR_SHUTDOWN_TIMEOUT, and MTR_START_TIMEOUT
environment variables. If they are set, their values are used
to set the --testcase-timeout, --suite-timeout,
--shutdown-timeout, and --start-timeout options, respectively.
(Bug#49210: http://bugs.mysql.com/bug.php?id=49210)