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MySQL Community Server 5.5.43 has been released

Dear MySQL users,

MySQL Server 5.5.43 is a new version of the 5.5 production release
of the world's most popular open source database. MySQL 5.5.43 is
recommended for use on production systems.

MySQL 5.5 includes several high-impact enhancements to improve the
performance and scalability of the MySQL Database, taking advantage of
the latest multi-CPU and multi-core hardware and operating systems. In
addition, with release 5.5, InnoDB is now the default storage engine for
the MySQL Database, delivering ACID transactions, referential integrity
and crash recovery by default.

MySQL 5.5 also provides a number of additional enhancements including:

  - Significantly improved performance on Windows, with various
    Windows specific features and improvements
  - Higher availability, with new semi-synchronous replication and
    Replication Heartbeat
  - Improved usability, with Improved index and table partitioning,
    SIGNAL/RESIGNAL support and enhanced diagnostics, including a new
    Performance Schema monitoring capability.

For a more complete look at what's new in MySQL 5.5, please see the
following resources:

MySQL 5.5 is GA, Interview with Tomas Ulin:




Whitepaper: What's New in MySQL 5.5:


If you are running a MySQL production level system, we would like to
direct your attention to MySQL Enterprise Edition, which includes the
most comprehensive set of MySQL production, backup, monitoring,
modeling, development, and administration tools so businesses can
achieve the highest levels of MySQL performance, security and uptime.


For information on installing MySQL 5.5.43 on new servers, please see
the MySQL installation documentation at


For upgrading from previous MySQL releases, please see the important
upgrade considerations at:


MySQL Database 5.5.43 is available in source and binary form for a
number of platforms from our download pages at:


The following section lists the changes in the MySQL source code since
the previous released version of MySQL 5.5. It may also be viewed
online at:



Changes in MySQL 5.5.43 (2015-04-06)

   Functionality Added or Changed

     * CMake support was updated to handle CMake version 3.1.
       (Bug #20344207)

     * The server now includes its version number when it writes
       the initial "starting" message to the error log, to make
       it easier to tell which server instance error log output
       applies to. This value is the same as that available from
       the version system variable. (Bug #74917, Bug #20052694)

   Bugs Fixed

     * Replication: When using a slave configured to use a
       special character set such as UTF-16, UTF-32, or UCS-2,
       the receiver (I/O) thread failed to connect. The fix
       ensures that in such a situation, if a slave's character
       set is not supported then default to using the latin1
       character set. (Bug #19855907)

     * Ordering by a GROUP_CONCAT() result could cause a server
       exit. (Bug #19880368, Bug #20730220)

     * A malformed mysql.proc table row could result in a server
       exit for DROP DATABASE of the database associated with
       the proc row. (Bug #19875331)

     * For a prepared statement with an ORDER BY that refers by
       column number to a GROUP_CONCAT() expression that has an
       outer reference, repeated statement execution could cause
       a server exit. (Bug #19814337)

     * Large values of the transaction_prealloc_size system
       variable could cause the server to allocate excessive
       amounts of memory. The maximum value has been adjusted
       down to 128K. A similar change was made for
       transaction_alloc_block_size. Transactions can still
       allocate more than 128K if necessary; this change reduces
       the amount that can be preallocated, as well as the
       maximum size of the incremental allocation blocks. (Bug
       #19770858, Bug #20730053)

     * A server exit could occur for queries that compared two
       rows using the <=> operator and the rows belonged to
       different character sets. (Bug #19699237, Bug #20730155)

     * Certain InnoDB errors caused stored function and trigger
       condition handlers to be ignored. (Bug #19683834, Bug

     * The optimizer could raise an assertion due to incorrectly
       associating an incorrect field with a temporary table.
       (Bug #19612819, Bug #20730129)

     * The server could exit due to an optimizer failure to
       allocate enough memory for resolving outer references.
       (Bug #18782905, Bug #19892803)

     * Starting the server with start service or mysqld_safe
       could result in failure to use the correct plugin
       directory. (Bug #17619241)

     * Creating a FEDERATED table with an AUTO_INCREMENT column
       using a LIKE clause results in a server exit. (Bug

On behalf of Oracle/MySQL RE Team
Hery Ramilison

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