オリジナル版：http://lists.mysql.com/announce/968
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MySQL Community Server 5.6.23がリリースされました。MySQL 5.6.23は、プロダクションシステムでの使用をお勧めします。
MySQL 5.6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/5.6/en/mysql-nutshell.html
新たなサーバにMySQL 5.6.23をインストール、または以前のMySQLリリースからMySQL 5.6.23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/5.6/en/installing.html
下記のダウンロードページから、MySQLサーバの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
http://dev.mysql.com/downloads/
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。
フィードバック、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。
https://wikis.oracle.com/display/mysql/Contributing
以下のセクションは、MySQL5.6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/relnotes/mysql/5.6/en/news-5-6-23.html
以下は、追加または変更された機能です。
Changes in MySQL 5.6.23 (2015-02-02)
Security Notes
* The linked OpenSSL library for the MySQL Commercial
Server has been updated from version 1.0.1j to version
1.0.1k. Issues fixed in the new version are described at
http://www.openssl.org/news/vulnerabilities.html.
This change does not affect the Oracle-produced MySQL
Community build of MySQL Server, which uses the yaSSL
library instead. (Bug #20375530)
Functionality Added or Changed
* Support for the SSL 2.0 and SSL 3.0 protocols has been
disabled because they provide weak encryption. (Bug
#19820550)
* yaSSL was upgraded to version 2.3.7. (Bug #19695101, Bug
#20201864)
* The valid date range of the SSL certificates in
mysql-test/std_data has been extended to the year 2029.
(Bug #18366947)
Bugs Fixed
* InnoDB: A tablespace export operation set the purge state
to PURGE_STATE_STOP but the purge thread did not check
the purge state until the current purge operation was
completed. In the case of a large history list, the
tablespace export operation was delayed, waiting for the
current purge operation to finish. The purge state is now
checked with every purge batch. (Bug #20266847, Bug
#75298)
* InnoDB: An ALTER TABLE ... ADD INDEX operation raised an
assertion due to assertion code that did not allow an
online index status of ONLINE_INDEX_ABORTED_DROPPED. The
assertion code has been relaxed. (Bug #20198726)
* InnoDB: An error occurred when the push_warning_printf
function was invoked during server recovery. This
function was previously used to print a warning message
to the client. Also, current_thd was NULL when the server
was restarted. (Bug #20144839)
* InnoDB: An ALTER TABLE operation that changed the name of
a foreign key column resulted in a failure when reloading
the foreign key constraint. The previous column name
remained in the data dictionary cache instead of being
evicted. (Bug #20031243)
* InnoDB: Error messages regarding a size limitation on
BLOB or TEXT data inserted in a single transaction have
been revised. (Bug #19975322)
* InnoDB: DML operations on a table with full-text search
indexes raised an invalid assertion. (Bug #19905246)
References: This bug is a regression of Bug #19314480.
* InnoDB: A multiple-table delete operation caused the
server to halt. (Bug #19815702)
* InnoDB: A FLUSH TABLES operation raised an assertion.
(Bug #19803418)
* InnoDB: With change buffering enabled, a buffered
sequence of operations that should not have been buffered
resulted in an Unable to purge a record error. (Bug
#19528825, Bug #73767)
* InnoDB: On non-Windows platforms, os-file_pread and
os_file_pwrite functions return -1 when an error occurs.
This value was printed in an error message as the number
of bytes read or written. Instead of printing the -1
value in the error message, a separate error message
indicating a system call failure is now printed. Thanks
to David Bennett for the patch. (Bug #19315210, Bug
#73365)
* InnoDB: A slow shutdown (innodb_fast_shutdown=0) after
crash recovery raised an assertion. Slow shutdown did not
wait for background rollback operations to finish before
proceeding. (Bug #16862810)
* InnoDB: The integer column value was handled incorrectly
for the memcached incr and decr commands. (Bug #69415,
Bug #20083106, Bug #74874, Bug #20044123)
* Partitioning: A failed ALTER TABLE ... TRUNCATE PARTITION
statement or a failed TRUNCATE TABLE statement against a
partitioned table sometimes left inconsistent metadata in
the table cache; subsequent SQL statements reusing this
metadata failed, and could in some cases also lead to a
failure of the server. (Bug #74292, Bug #19786861)
* Replication: If a client thread on a slave executed FLUSH
TABLES WITH READ LOCK while the master executed a DML,
executing SHOW SLAVE STATUS in the same client became
blocked, causing a deadlock. The fix ensures that the
read lock is only held during the period that the relay
log is being updated and the deadlock is avoided. (Bug
#19843808)
* Replication: When an XA transaction was active, executing
an internal rollback, for example using the BINLOG
statement, resulted in an assertion. The fix ensures that
a rollback happens only for a slave when a transaction
spans multiple binary log files. Rollback does not happen
now if the Format_description comes from the BINLOG
statement being executed in the MySQL client. (Bug
#74597, Bug #19928622)
* Replication: In normal usage, it is not possible for a
slave to have more GTIDs than the master. But in certain
situations, such as after a hardware failure or
incorrectly cleared gtid_purged, the master's binary log
could be truncated. This fix ensures that in such a
situation, the master now detects that the slave has
transactions with GTIDs which are not on the master. An
error is now generated on the slave and the I/O thread is
stopped with an error. The master's dump thread is also
stopped. This prevents data inconsistencies during
replication. (Bug #72635, Bug #18789758)
* Replication: When using SHOW SLAVE STATUS to monitor
replication performance, Seconds_Behind_Master sometimes
displayed unexpected lag behind the master. This was
caused by Previous_gtids_log_events being written to the
slave's relay log with a timestamp behind the master, and
then being used to calculate the Seconds_Behind_Master.
This fix ensures that events generated on the slave that
are added to the relay log and are not used when
calculating Seconds_Behind_Master. (Bug #72376, Bug
#18622657)
* On Ubuntu 14.10, MySQL install operations could fail to
reload AppArmor. (Bug #20092641)
* EXPLAIN within an XA transaction could raise an
assertion. (Bug #19941492)
* Binary log files created by streaming the binary log from
a remote server with mysqlbinlog were given an access
mode more permissive than the original files. (Bug
#19649868)
* If the audit_log plugin encountered a disk-full error,
the server would exit.
Now, if the file system to which the audit log is being
written fills up, a "disk full" error is written to the
error log. Audit logging continues until the audit log
buffer is full. If free disk space has not been made
available by the time the buffer fills, client sessions
will hang, and stopping the server at the time of client
sessions hanging will result in audit log corruption. To
avoid this if client sessions are hung, ensure that free
space is available on the audit logging file system
before stopping the server. (Bug #19411485)
* For failure to create a temporary table due to being out
of file descriptors, the server exited rather than
returning an error. (Bug #18948649)
* For some queries that contained a derived table (subquery
in the FROM clause), delay of materialization resulted in
a suboptimal execution plan due to a less accurate
row-count estimate. (Bug #18607971)
* For UPDATE and DELETE statements, the server could exit
after attempting to access an uninitialized data
structure. (Bug #18036143)
* Starting the server with start service or mysqld_safe
could result in failure to use the correct plugin
directory. (Bug #17619241)
* FLUSH TABLES on a FEDERATED table failed if the table had
been idle longer than the wait_timeout time plus the TCP
keepalive time. (Bug #17599258)
* Selecting all columns from INFORMATION_SCHEMA.TABLES did
not reopen tables if they were in the table cache, but
selecting a subset of those columns under the same
conditions did reopen tables. (Bug #16869534)
* If my_write() encountered a disk-full condition, it could
return an incorrect error value. (Bug #16078792, Bug
#19984788)
* InnoDB boolean full-text searches incorrectly handled +
combined with parentheses; for example, +word1 +(>word2
<word3). (Bug #74845, Bug #20028323)
* MySQL failed to compile with GCC 4.9.1 in debug mode.
(Bug #74710, Bug #19974500)
* For debug builds, the server could exit due to an
optimizer failure to allocate enough memory for group
references. (Bug #74447, Bug #19855522)
* The server no longer logs the following warnings because
they are uninformative: Client failed to provide its
character set. 'charset' will be used as client character
set. (Bug #72543, Bug #18708334)
* A file created for an internal temporary table could
cause problems if the file was orphaned for some reason
and the file name was reused for later queries. (Bug
#32917, Bug #11747548)
On behalf of Oracle/MySQL RE Team