> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/release-notes/community-server/old-releases/5.1/5.1.51.md).

# MariaDB 5.1.51 Release Notes

The most recent release in the [MariaDB 5.1 series](/docs/release-notes/community-server/old-releases/5.1/changes-improvements-in-mariadb-5-1.md) is:[**MariaDB 5.1.67**](/docs/release-notes/community-server/old-releases/5.1/5.1.67.md)

[Download](https://archive.mariadb.org/mariadb-5.1.51/) | **Release Notes** | [Changelog](/docs/release-notes/community-server/changelogs/changelogs-mariadb-51-series/mariadb-5151-changelog.md) |[Overview of 5.1](/docs/release-notes/community-server/old-releases/5.1/changes-improvements-in-mariadb-5-1.md)

**Release date:** 19 Nov 2010

For a list of every change made in this release, see the [Changelog](/docs/release-notes/community-server/changelogs/changelogs-mariadb-51-series/mariadb-5151-changelog.md). For a description of this release see the [MariaDB 5.1 overview](/docs/release-notes/community-server/old-releases/5.1/changes-improvements-in-mariadb-5-1.md).

In most respects [MariaDB](https://mariadb.com/docs/server/) will work exactly as MySQL: all commands, interfaces, libraries and APIs that exist in MySQL also exist in MariaDB.

In addition to the differences noted in previous [release notes](/docs/release-notes/community-server.md) and [changelogs](/docs/release-notes/community-server/changelogs.md), the main differences between MariaDB and MySQL are:

## Includes MySQL 5.1.51

For [MariaDB 5.1.51](/docs/release-notes/community-server/old-releases/5.1/5.1.51.md) we have merged in all of the upstream changes from MySQL\
5.1.51. The MySQL [5.1.51](https://dev.mysql.com/doc/refman/5.1/en/news-5-1-51.html) release notes have details of what changes were made upstream by MySQL since 5.1.50.

## Includes [XtraDB](/docs/server/server-usage/storage-engines/innodb.md) 5.1.51-12

We have included XtraDB from Percona-server-5.1.51-12 in this version of MariaDB.

## Shared Library - libmysqld.so

In addition to the static library, libmysqld.a, this version of MariaDB also includes a corresponding shared library, libmysqld.so. This is needed by applications such as Amarok, which use the embedded server from within dynamically loaded plugins or libraries. Details of this are found in MWL#74, and this patch fixes [MySQL Bug #39288](https://bugs.mysql.com/bug.php?id=39288).

## Bug Fixes

Like [previous releases](/docs/release-notes/community-server.md), [MariaDB 5.1.51](/docs/release-notes/community-server/old-releases/5.1/5.1.51.md) includes several bug fixes and other improvements. Specific bugs fixed in [MariaDB 5.1.51](/docs/release-notes/community-server/old-releases/5.1/5.1.51.md) include:

* [MySQL Bug #57491](https://bugs.mysql.com/bug.php?id=57491) thd->main\_da.is\_ok() assert in embedded
* [MySQL Bug #26447](https://bugs.mysql.com/bug.php?id=26447) "ALTER TABLE .. ORDER" does not work with InnoDB and auto\_increment keys
* [MySQL Bug #35850](https://bugs.mysql.com/bug.php?id=35850) Performance regression in 5.1.23/5.1.24
* [MySQL Bug #39653](https://bugs.mysql.com/bug.php?id=39653) find\_shortest\_key in sql\_select.cc does not consider clustered primary keys
* [MySQL Bug #55656](https://bugs.mysql.com/bug.php?id=55656) mysqldump can be slower after [MySQL Bug #39653](https://bugs.mysql.com/bug.php?id=39653) fix
* [MySQL Bug #43152](https://bugs.mysql.com/bug.php?id=43152) Assertion \`bitmap\_is\_set\_all(\&table->s->all\_set)' failed in handler::ha\_reset
* [MySQL Bug #44797](https://bugs.mysql.com/bug.php?id=44797) plugins w/o command-line options have no disabling option in --help
* [MySQL Bug #53161](https://bugs.mysql.com/bug.php?id=53161) Left join optimized into join leads to incorrect results
* [MySQL Bug #56862](https://bugs.mysql.com/bug.php?id=56862) Execution of a query that uses index merge returns a wrong result
* [MySQL Bug #49600](https://bugs.mysql.com/bug.php?id=49600) Server incorrectly processing RIGHT JOIN with constant WHERE clause and no index
* [MySQL Bug #49322](https://bugs.mysql.com/bug.php?id=49322) Server is adding extra NULL row on processing a WHERE clause
* [MySQL Bug #57024](https://bugs.mysql.com/bug.php?id=57024) Serious performance issue with an outer join
* [Bug #618608](https://bugs.launchpad.net/bugs/618608) FederatedX is not the default on Windows
* [Bug #608369](https://bugs.launchpad.net/bugs/608369) (M) Aria engine recovery failure: "Page: 1 Found wrong page type 0' on CHECK TABLE EXTENDED
* [Bug #640419](https://bugs.launchpad.net/bugs/640419) Wrong result with sort\_union/index\_merge in maria-5.1 and a large table
* [Bug #634943](https://bugs.launchpad.net/bugs/634943) "marked as crashed", "zerofilling" and "wrong data in bitmap" when recovering Aria tables
* [Bug #605798](https://bugs.launchpad.net/bugs/605798) RQG: Table corruption after Maria engine recovery - "Wrong data in bitmap"
* [Bug #618558](https://bugs.launchpad.net/bugs/618558) Assertion data\_length < ((block\_size) \*3 / 4) in write\_block\_record() at ma\_blockrec.c:3483 with --maria-block-size=1K
* [Bug #634955](https://bugs.launchpad.net/bugs/634955) ma\_blockrec.c:3932: \_ma\_update\_at\_original\_place: Assertion \`blocks->count > 1 || ((new\_row->total\_length) > (share->base.min\_block\_length) ? (new\_row->total\_length) : (share->base.min\_block\_length)) <= length\_on\_head\_page' on Aria recovery
* [Bug #643463](https://bugs.launchpad.net/bugs/643463) slow XtraDB shutdown due to 10 second sleep in purge thread

{% hint style="info" %}
Be notified of new MariaDB Server releases automatically by [subscribing](https://lists.mariadb.org/postorius/lists/announce.lists.mariadb.org/) to the MariaDB Foundation community announce 'at' lists.mariadb.org announcement list (this is a low traffic, announce-only list). MariaDB plc customers will be notified for all new releases, security issues and critical bug fixes for all MariaDB plc products thanks to the Notification Services.

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{% endhint %}

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