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From:Karen Langford Date:November 1 2010 11:13pm
Subject:MySQL Community Server 5.1.52 has been released
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Dear MySQL users,

MySQL Community Server 5.1.52, a new version of the popular Open
Source Database Management System, has been released.  MySQL 5.1.52 is
recommended for use on production systems.

For an overview of what's new in MySQL 5.1, please see

For information on installing MySQL 5.1.52 on new servers or upgrading
to MySQL 5.1.52 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.:

For information on open issues in MySQL 5.1, please see the errata
list at

The following section lists the changes in the MySQL source code since
the previous released version of MySQL 5.1.  It may also be viewed
online at



C.1.1. Changes in MySQL 5.1.52 (11 October 2010)

    Bugs fixed:

      * InnoDB Storage Engine: InnoDB incorrectly reported an error
        when a cascading foreign key constraint deleted more than 250
        rows. (Bug#57255:

      * InnoDB Storage Engine: A SELECT ... FOR UPDATE statement
        affecting a range of rows in an InnoDB table could cause a
        crash in the debug version of the server.

      * InnoDB Storage Engine: Improved the performance of UPDATE
        operations on InnoDB tables, when only non-indexed columns are
        changed. (Bug#56340:

      * InnoDB Storage Engine: The server could crash on shutdown, if
        started with --innodb-use-system-malloc=0.

      * InnoDB Storage Engine: Setting the PACK_KEYS=0 table option
        for an InnoDB table prevented new indexes from being added to
        the table. (Bug#54606:

      * InnoDB Storage Engine: Changed the locking mechanism for the
        InnoDB data dictionary during ROLLBACK operations, to improve
        concurrency for REPLACE statements.

      * InnoDB Storage Engine: InnoDB transactions could be
        incorrectly committed during recovery, rather than rolled
        back, if the server crashed and was restarted after performing
        ALTER TABLE...ADD PRIMARY KEY on an InnoDB table, or some
        other operation that involves copying the entire table.

      * Partitioning: Replication: Attempting to execute LOAD DATA on
        a partitioned MyISAM table while using statement-based logging
        mode caused the master to hang or crash.

      * Partitioning: Multi-table UPDATE statements involving a
        partitioned MyISAM table could cause this table to become
        corrupted. Not all tables affected by the UPDATE needed to be
        partitioned for this issue to be observed.

      * Partitioning: EXPLAIN PARTITIONS returned bad estimates for
        range queries on partitioned MyISAM tables. In addition,
        values in the rows column of EXPLAIN PARTITIONS output did not
        take partition pruning into account.

      * Replication: Backticks used to enclose identifiers for
        savepoints were not preserved in the binary log, which could
        lead to replication failure when the identifier, stripped of
        backticks, could be misinterpreted, causing a syntax or other
        This could cause problems with MySQL application programs
        making use of generated savepoint IDs. If, for instance,
        java.sql.Connection.setSavepoint() is called without any
        parameters, Connector/J automatically generates a savepoint
        identifier consisting of a string of hexadecimal digits 0-F
        encased in backtick (`) characters. If such an ID took the
        form `NeN` (where N represents a string of the decimal digits
        0-9, and e is a literal uppercase or lowercase "E" character).
        Removing the backticks when writing the identifier into the
        binary log left behind a substring which the slave MySQL
        server tried to interpret as a floating point number, rather
        than as an identifier. The resulting syntax error caused loss
        of replication.
        See also Bug#55962:

      * If a query specified a DATE or DATETIME value in a format
        different from 'YYYY-MM-DD HH:MM:SS', a greater-than-or-equal
        (>=) condition matched only greater-than values in an indexed
        TIMESTAMP column.

      * If there was an active SELECT statement, an error arising
        during trigger execution could cause a server crash.

      * With an UPDATE IGNORE statement including a subquery that was
        evaluated using a temporary table, an error transferring the
        data from the temporary was ignored, causing an assertion to
        be raised. (Bug#54543:

      * Row subqueries producing no rows were not handled as UNKNOWN
        values in row comparison expressions.

      * In some cases, when the left part of a NOT IN subquery
        predicate was a row and contained NULL values, the query
        result was incorrect.

      * For some queries, the optimizer produced incorrect results
        using the Index Merge access method with InnoDB tables.

      * EXPLAIN produced an incorrect rows value for queries evaluated
        using an index scan and that included LIMIT, GROUP BY, and
        ORDER BY on a computed column.

      * mysql_store_result() and mysql_use_result() are not for use
        with prepared statements and are not intended to be called
        following mysql_stmt_execute(), but failed to return an error
        when invoked that way.

      * A malformed packet sent by the server when the query cache was
        in use resulted in lost-connection errors.

      * CREATE TABLE failed if a column referred to in an index
        definition and foreign key definition was in different
        lettercases in the two definitions.


Karen Langford  MySQL Release Engineer
Database Group, Oracle.

MySQL Community Server 5.1.52 has been releasedKaren Langford2 Nov