Dear MySQL users,

MySQL Server 5.6.39, a new version of the popular Open Source
Database Management System, has been released. MySQL 5.6.39 is
recommended for use on production systems.

For an overview of what's new in MySQL 5.6, please see

     Starting with 5.6.11, Microsoft Windows packages for MySQL 5.6
     are available both as a "full" installer and as a "web" installer.
     The full installer is significantly larger and comes bundled with
     the latest software releases available. This bundle makes it easy
     to download and configure a full server and development suite.

     The web installer doesn't come bundled with any actual products
     and instead relies on download-on-demand to fetch only the
     products you choose to install. This makes the initial download
     much smaller but increases install time as the individual products
     will need to be downloaded.

For information on installing MySQL 5.6.39 on new servers or upgrading
to MySQL 5.6.39 from previous MySQL releases, please see

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

Not all mirror sites may be up to date at this point in time, so if you
can't find this version on some mirror, please try again later or choose
another download site.

We welcome and appreciate your feedback, bug reports, bug fixes,
patches, etc:

The following link lists the changes in the MySQL 5.6 since
the release of MySQL 5.6.38. It may also be viewed
online at


Changes in MySQL 5.6.39 (2018-01-15, General Availability)

     * Configuration Notes

     * Security Notes

     * Test Suite Notes

     * Bugs Fixed

   Configuration Notes

     * For RHEL, SLES, and Fedora RPMs, the default plugin
       directory for debug builds has been changed from
       /usr/lib64/mysql/plugin to /usr/lib64/mysql/plugin/debug.
       (Bug #27072155, Bug #88363)

   Security Notes

     * Incompatible Change: Passwords are now restricted to a
       maximum of 256 characters for the sha256_password
       authentication plugin, and for the PASSWORD() function
       when old_passwords=2. Also, the number of password
       hashing rounds is capped to limit CPU time used. (Bug
       #27099029, Bug #27194270)

     * The linked OpenSSL library for the MySQL Commercial
       Server has been updated to version 1.0.2n. Issues fixed
       in the new OpenSSL version are described at
       This change does not affect the Oracle-produced MySQL
       Community build of MySQL Server, which uses the yaSSL
       library instead. (Bug #27212666, Bug #27236394)

   Test Suite Notes
     * Documentation for the MySQL Test Suite is now maintained
       in the MySQL source tree using Doxygen
       The related Unix man pages that
       previously were produced from the old test suite manual
       are no longer updated and have gone out of date.
       Consequently, they are no longer included in MySQL
       distributions. (Bug #27021754)

   Bugs Fixed

     * InnoDB: An ALTER TABLE operation caused the server to
       halt. (Bug #26492721)

     * InnoDB: A FLUSH TABLES operation failed to drop an
       aborted index. While removing the table from the cache,
       the clustered index was dropped prior to checking for the
       aborted index. (Bug #26256456, Bug #86607)

     * InnoDB: While innodb_undo_log_truncate was enabled,
       warnings that should only appear in a debug version of
       MySQL were printed to the error log when the length of
       the history list exceeded 2000000. (Bug #24296076, Bug

     * InnoDB: Full-text search on indexed columns that use a
       binary collation did not return case sensitive matches.
       (Bug #21625016, Bug #78048)

     * Partitioning: In certain cases when fetching heap records
       a partition ID could be set to zero. (Bug #86255, Bug

     * Replication: With semisynchronous replication in use, if
       RESET MASTER was issued while an active transaction was
       waiting for an acknowledgement from the slave, the count
       of waiting sessions in the
       Rpl_semi_sync_master_wait_sessions server status variable
       was incorrect after the wait was completed. (Bug

     * Microsoft Windows: On Windows, with the myisam_use_mmap
       and flush system variables enabled, MyISAM did not always
       flush table files properly. (Bug #26880757)

     * Microsoft Windows: On Windows, resolution was improved of
       a timer used for query performance assessment. (Bug
       #22305994, Bug #26734457)

     * VALUES() was not handled correctly in some cases. (Bug
       References: See also: Bug #19601973, Bug #17458914.

     * The Performance Schema now stores rewritten rather than
       raw SQL statement text when available. (Bug #26732229)

     * Incorrect results or a server exit could result when
       SHA2() was passed a user-defined variable in some
       character sets. (Bug #26704451)

     * Creating a table with excessive index information could
       cause a server exit. (Bug #26529369)

     * Some statements could cause a buffer overflow in the
       digest code. Thanks to Laurynas Biveinis and Roel van de
       Paar for the patch. (Bug #26021187)

     * Incorrect results could occur on a table with a unique
       index when the optimizer chose a loose index scan even
       though the unique index had no index extensions. (Bug
       #25989915, Bug #86165, Bug #26532061, Bug #87207)
       References: This issue is a regression of: Bug #21749123,
       Bug #78244.

     * Executing a stored procedure containing a statement that
       created a table from the contents of certain SELECT
       statements could result in a memory leak. (Bug #25586773)

     * For geometry calculations, invalid input parameters could
       lead to an incorrect result buffer and cause an assertion
       to be raised or a server exit. (Bug #25062396)

     * Setting the MYSQL_GROUP_SUFFIX environment variable had
       no effect. (Bug #23072792)

     * A circular dependency problem involving
       sql/ was resolved. (Bug #16877045)

     * A prepared statement containing an ORDER BY list that
       referred to a parameter was not always handled correctly.
       (Bug #87863, Bug #26867652)

     * REFERENCES privilege checking could use the incorrect  
       database in some cases. (Bug #26106655)

On Behalf of MySQL/ORACLE RE Team
Gipson Pulla

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