MariaDB 5.5.51 发布了，该版本主要改进记录如下:

• Revision #5ad02062016-08-09 16:15:10 +0300

  • MDEV-10341: InnoDB: Failing assertion: mutex_own(mutex) - mutex_exit_func

• Revision #0098d782016-08-09 13:25:40 +0200

  • MDEV-10465 general_log_file can be abused

• Revision #a3f64242016-08-08 12:58:27 +0200

  • MDEV-6128:[PATCH] mysqlcheck wrongly escapes '.' in table names

• Revision #2a54a532016-08-08 10:27:22 +0200

  • MDEV-10465 general_log_file can be abused

• Revision #a7c43a62016-01-26 14:49:25 +0200

  • MDEV-9304: MariaDB crash with specific query

• Revision #5269d372016-08-08 18:37:02 +0400

  • MDEV-10468 Assertion `nr >= 0.0' failed in Item_sum_std::val_real()

• Revision #1b3430a2016-08-08 16:04:40 +0400

  • MDEV-10500 CASE/IF Statement returns multiple values and shifts further result values to the next column

• Revision #5e23b632016-08-07 11:02:42 +0200

  • MDEV-10506 Protocol::end_statement(): Assertion `0' failed upon ALTER TABLE

• Revision #93d5cdf2016-08-04 13:14:45 +0300

  • MDEV-9946: main.xtradb_mrr fails sporadically

• Revision #c0cb84b 2016-08-04 10:57:55 +0200 - Merge branch 'bb-5.5-serg' into 5.5

• Revision #470f2592016-08-03 20:56:24 +0200

  • MDEV-10465 general_log_file can be abused

• Revision #02141152016-08-01 16:53:57 +0200

  • trivial cleanup

• Revision #03dec1a2016-08-03 18:05:29 +0200

  • MDEV-10350 "./mtr --report-features" doesn't work

• Revision #9d2f8922016-08-03 17:58:56 +0200

  • MDEV-7329 plugins.pam_cleartext fails sporadically in buildbot

• Revision #75891ed2016-08-03 17:50:45 +0200

  • improve pam_cleartext.test a bit

• Revision #5265243 2016-08-03 20:44:08 +0200 - Merge branch 'merge/merge-xtradb-5.5' into 5.5

• Revision #e316c462016-08-03 20:43:29 +0200

  • 5.5.50-38.0

• Revision #19fe10c2016-08-03 20:39:47 +0200

  • MDEV-6581 Writing to TEMPORARY TABLE not possible in read-only

• Revision #a350e53 2016-08-03 20:38:25 +0200 - Merge branch 'mysql/5.5' into 5.5

• Revision #eb32dfd2016-08-03 11:49:35 +0400

  • MDEV-10365 - Race condition in error handling of INSERT DELAYED

• Revision #511313b2016-08-03 13:42:46 +0000

  • MDEV-10010 - potential deadlock on windows due to recursive SRWLock acquisition

• Revision #141f88d2016-08-03 12:41:38 +0000

  • MDEV-10357 my_context_continue() does not store current fiber on Windows

• Revision #ecb7ce72016-08-03 15:55:48 +0400

  • MDEV-10467 Assertion `nr >= 0.0' failed in Item_sum_std::val_real() Backporting MDEV-5781 from 10.0.

• Revision #35c9c852016-08-03 13:40:53 +0300

  • MDEV-10217: innodb.innodb_bug59641 fails sporadically in buildbot: InnoDB: Failing assertion: current_rec != insert_rec in file page0cur.c line 1052

• Revision #6b71a6d2016-08-02 18:52:51 +0200

  • MDEV-10383 Named pipes : multiple servers can listen on the same pipename

• Revision #5fdb3cf2016-07-29 18:21:08 +0200

  • MDEV-10419: crash in mariadb 10.1.16-MariaDB-1trusty

• Revision #c6aaa2a2016-07-30 10:53:01 +0300

  • MDEV-10228: update test results

• Revision #15ef38d2016-07-27 00:38:51 +0300

  • MDEV-10228: Delete missing rows with OR conditions

• Revision #1b5da2c2016-07-21 15:32:28 +0400

  • MDEV-10316 - main.type_date fails around midnight sporadically

• Revision #5cf49cd2016-07-15 23:51:30 +0300

  • MDEV-10248 Cannot Remove Test Tables

• Revision #4e19aa32016-07-12 12:13:31 +0200

  • MDEV-10318 unset params in --ps --embedded

• Revision #97ded962016-07-11 17:03:03 +0000

  • MDEV-10318 : Fix crash in embedded, in case prepared statement has parameter placeholders, but does not bind parameters

• Revision #e81455bb2015-05-04 08:32:05 +0200

  • MDEV-7973 bigint fail with gcc 5.0

• Revision #a7814d42016-06-30 12:59:52 +0400

  • MDEV-10311 - funcs_1.processlist_priv_no_prot fails sporadically

• Revision #79f852a2016-06-22 14:17:06 +0200

  • MDEV-10050: Crash in subselect

• Revision #ef92aaf2016-06-22 22:37:28 +0300

  • MDEV-10083: Orphan ibd file when playing with foreign keys

• Revision #a482e762016-06-20 16:12:54 +0200

  • fix a mysql-5.5.50 merge: mysqlcheck

• Revision #95bf6962016-06-19 14:51:03 +0200

  • MDEV-9749 InnoDB receives 'Bad file descriptor' error, possibly related to feedback plugin

• Revision #7f38a072016-06-17 18:54:11 +0400

  • MDEV-10043 - main.events_restart fails sporadically in buildbot (crashes upon  shutdown)

• Revision #128930c2016-06-17 12:39:20 -0400

  • bump the VERSION

• Revision #7ff86b42016-06-17 14:59:17 +0300

  • MDEV-10247 TokuDB assertion error when building with DEBUG

MariaDB数据库管理系统是 MySQL 的一个分支，主要由开源社区在维护，采用GPL授权许可 MariaDB的目的是完全兼容MySQL，包括API和命令行，使之能轻松成为MySQL的代替品。在存储引擎方面，使用XtraDB（英 语：XtraDB）来代替MySQL的InnoDB。 MariaDB由MySQL的创始人Michael Widenius（英语：Michael Widenius）主导开发，他早前曾以10亿美元的价格，将自己创建的公司MySQL AB卖给了SUN，此后，随着SUN被甲骨文收购，MySQL的所有权也落入Oracle的手中。MariaDB名称来自Michael Widenius的女儿Maria的名字。

MariaDB 基于事务的 Maria 存储引擎，替换了 MySQL 的 MyISAM 存储引擎，它使用了 Percona 的 XtraDB，InnoDB 的变体，分支的开发者希望提供访问即将到来的MySQL 5.4 InnoDB性能。这个版本还包括了 PrimeBase XT (PBXT) 和 FederatedX存储引擎。

下载地址：https://downloads.mariadb.org/mariadb/5.5.51/