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MySQL Community Server 5.5.50 has been released

Dear MySQL users,

MySQL Server 5.5.50 is a new version of the 5.5 production release
of the world's most popular open source database. MySQL 5.5.50 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:




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 5.5.50 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 5.5.50 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 5.5.50 (2016-06-02)

     * Functionality Added or Changed

     * Bugs Fixed

   Functionality Added or Changed

     * The version of the tcmalloc library included in MySQL
       distributions was very old. It has been removed and is no
       longer included with MySQL. (Bug #80994, Bug #23068660)

   Bugs Fixed

       table with a foreign key constraint defined failed with
       an incorrect "duplicate entry" error rather than a
       foreign key constraint violation error. (Bug #23135731)
       References: This issue is a regression of: Bug #78853,
       Bug #22037930.

     * Setting sort_buffer_size to a very large value could
       cause some operations to fail with an out-of-memory
       error. (Bug #22594514)

     * Several potential buffer overflow issues were corrected.
       (Bug #21977380, Bug #23187436, Bug #23202778, Bug
       #23195370, Bug #23202699)

     * If the CA certificate as given to the --ssl-ca option had
       an invalid path, yaSSL returned an error message
       different from OpenSSL. Now both return SSL connection
       error: SSL_CTX_set_default_verify_paths failed. (Bug

     * Some string functions returned one or a combination of
       their parameters as their result. If one of the
       parameters had a non-ASCII character set, the result
       string had the same character set, resulting in incorrect
       behavior when an ASCII string was expected. (Bug

     * A null pointer dereference of a parser structure could
       occur during stored procedure name validation. (Bug
       #79396, Bug #22286421)

     * mysqld_multi displayed misleading error messages when it
       was unable to execute my_print_defaults. (Bug #74636, Bug