D.1.2. Changes in MySQL 5.6.7 (29 September 2012) Functionality Added or Changed * Important Change: Partitioning: The maximum number of partitions for a user-partitioned table is increased from 1024 to 8192. (Bug #11755685) * InnoDB: You can now select the compression level for InnoDB compressed tables, from the familiar range of 0-9 used by zlib. The compression level is controlled by the innodb_compression_level configuration option, with a default value of 6: + Increasing the compression level increases CPU overhead, possibly reducing the amount of storage needed for any particular row, reducing the possibility of a compression failure and subsequent page split. + Decreasing the compression level reduces CPU overhead, possibly increasing the amount of storage needed for any particular row, increasing the possibility of a compression failure and subsequent page split. * InnoDB: Each data block in an InnoDB compressed table contains a certain amount of empty space (padding) to allow DML operations to modify the row data without re-compressing the new values. Too much padding can increase the chance of a compression failure, requiring a page split, when the data does need to be re-compressed after extensive changes. The amount of padding can now be adjusted dynamically, so that DBAs can reduce the rate of compression failures without re-creating the entire table with new parameters, or re-creating the entire instance with a different page size. The associated new configuration options are innodb_compression_failure_threshold_pct, innodb_compression_pad_pct_max * InnoDB: New information_schema tables, innodb_cmp_per_index and innodb_cmp_per_index_reset, provide statistics on InnoDB tables that use compression. The statistics at the index level let DBAs measure whether the proportion of successful or failed compression operations is acceptable for a particular combination of table, index, page size, and workload. Typically, the compression failure rate should be less than 10%, particularly when using a compressed table to handle an OLTP-style workload with frequent INSERT, UPDATE, or DELETE operations. Because gathering those statistics could be very time consuming and would hurt performance negatively, the new tables are enabled only when the new configuration option innodb_cmp_per_index_enabled is set to ON. (It is OFF by default.) * When MySQL is configured with -DWITH_SSL=system to build with OpenSSL, CMake now produces an error if OpenSSL is older than version 1.0.1 (Bug #14167227) * The default has changed from false to true for the --secure-auth option for mysql and the MYSQL_SECURE_AUTH option for the mysql_options() C API function. (Bug #13789417) * The WITH_SSL option for CMake now accepts a path_name value that indicates the path name to the OpenSSL installation to use. This can be useful instead of a value of system when the CMake code detects an older or incorrect installed OpenSSL version. (Another permitted way to do the same thing is to set the CMAKE_PREFIX_PATH option to path_name.) (Bug #61619, Bug #12762891) * The server now issues a Note diagnostic if an index is created that duplicates an existing index. (Bug #37520, Bug #11748842) * The mysql_clear_password cleartext client-side authentication plugin is intended for authentication schemes that require the server to receive the password as entered on the client side, without hashing. Because the password is sent in the clear, this plugin should be used within the context of a secure connection, such as an SSL connection, to avoid exposing the password over the network. To make inadvertent use of this plugin less likely, it is now required that clients explicitly enable it. This can be done several ways: + Set the LIBMYSQL_ENABLE_CLEARTEXT_PLUGIN environment variable to a value that begins with 1, Y, or y. This enables the plugin for all client connections. + The mysql, mysqladmin, and mysqlslap client programs support an --enable-cleartext-plugin option that enables the plugin on a per-invocation basis. + The mysql_options() C API function supports a MYSQL_ENABLE_CLEARTEXT_PLUGIN option that enables the plugin on a per-connection basis. Also, any program that uses libmysqlclient and reads option files can enable the plugin by including an enable-cleartext-plugin option in an option group read by the client library. * The unused multi_range_count system variable is now deprecated, and will be removed in a future release. * The following items are deprecated and will be removed in a future MySQL release. Where alternatives are shown, applications should be updated to use them. + The SHOW PROFILE and SHOW PROFILES statements. Use the Performance Schema instead; see Chapter 20, "MySQL Performance Schema." + The unused date_format datetime_format time_format, and max_tmp_tables system variables. + The obsolete mysql.host table. New MySQL 5.6 installations will no longer create this table. For upgrades, mysql_upgrade will check for this table and issue a warning about it being deprecated if it is nonempty. Bugs Fixed * Performance: InnoDB: The OPTIMIZE TABLE statement now updates the InnoDB persistent statistics for that table when appropriate. (Bug #14238097) * Performance: InnoDB: This fix removes redundant checksum validation on InnoDB pages. The checksum was being verified both when a compressed page was read from disk and when it was uncompressed. Now the verification is only performed when the page is read from disk. (Bug #14212892, Bug #64170) * Performance: InnoDB: Creating large InnoDB log files on a Linux system could cause swapping, depending on the size of the log files and the available RAM. This fix uses the O_DIRECT setting while creating the log files to avoid filling up memory buffers with unnecessary data. (Bug #13029546, Bug #62478) * Performance: Replication: When slave_parallel_workers was enabled, an internal multiplier representing the number of events above a certain overrun level in the worker queue was never reset to zero, even when the excess had been taken care of; this caused the multiplier to grow without interruption over time, leading to a slowdown in event executions on the slave. (Bug #13897025) * Performance: View definitions (in .frm files) were not cached and thus every access to a view involved a file read. Definitions now are cached for better performance. (Bug #13819275) * Important Change: Replication: When issued during an ongoing transaction, any of the following statements that are used to control MySQL Replication now cause the transaction to be committed: + CHANGE MASTER TO + START SLAVE + STOP SLAVE + RESET SLAVE For more information, see Section 13.3.3, "Statements That Cause an Implicit Commit." (Bug #13858841) References: See also Bug #14298750, Bug #13627921. * Important Change: Formerly, the ExtractValue() and UpdateXML() functions supported a maximum length of 127 characters for XPath expressions supplied to them as arguments. This limitation has now been removed. (Bug #13007062, Bug #62429) * Partitioning: InnoDB: A SELECT from a partitioned InnoDB table having no primary key sometimes failed to return any rows where a nonempty result was expected. In such cases the server also returned the error Can't find record in table_name or Incorrect key file for table table_name. (Bug #13947868) * InnoDB: A race condition could cause assertion errors during a DROP TABLE statement for an InnoDB table. Some internal InnoDB functions did not correctly determine if a tablespace was missing; other functions did not handle the error code correctly if a tablespace was missing. (Bug #14251529) * InnoDB: With the MySQL 5.6 online DDL feature, an ALTER TABLE statement to add a primary key to an InnoDB table could succeed, even though the primary key columns contained duplicate values. (Bug #14219515) * InnoDB: The server could crash with a combination of a transaction with SERIALIZABLE isolation level, FLUSH TABLES ... WITH READ LOCK, and a subsequent query. The error message was: InnoDB: Failing assertion: prebuilt->stored_select_lock_type != LOCK_ NONE_UNSET (Bug #14222066) * InnoDB: The configuration option innodb_max_io_capacity was renamed to innodb_io_capacity_max, to emphasize its relationship to the existing innodb_io_capacity option. (Bug #14175020) * InnoDB: The server could crash with a signal 8 (division by zero error) due to a race condition while computing index statistics. (Bug #14150372) * InnoDB: The value of the NUMBER_PAGES_CREATED and NUMBER_PAGES_WRITTEN columns of the INFORMATION_SCHEMA.INNODB_BUFFER_POOL_STATS table were set to incorrect values, and the NUMBER_PAGES_GET column was not being set at all. (Bug #13639187) * InnoDB: When a SELECT ... FOR UPDATE, UPDATE, or other SQL statement scanned rows in an InnoDB table using a < or <= operator in a WHERE clause, the next row after the affected range could also be locked. This issue could cause a lock wait timeout for a row that was not expected to be locked. The issue occurred under various isolation levels, such as READ COMMITTED and REPEATABLE READ. (Bug #11765218) * Partitioning: For tables using PARTITION BY HASH or PARTITION BY KEY, when the partition pruning mechanism encountered a multi-range list or inequality using a column from the partitioning key, it continued with the next partitioning column and tried to use it for pruning, even if the previous column could not be used. This caused partitions which possibly matched one or more of the previous partitioning columns to be pruned away, leaving partitions that matched only the last column of the partitioning key. This issue was triggered when both of the following conditions were met: 1. The columns making up the table's partitioning key were used in the same order as in the partitioning key definition by a SELECT statement's WHERE clause as in the column definitions; 2. The WHERE condition used with the last column of the partitioning key was satisfied only by a single value, while the condition testing some previous column from the partitioning key was satisfied by a range of values. An example of a statement creating a partitioned table and a query against this for which the issue described above occurred is shown here: CREATE TABLE t1 ( c1 INT, c2 INT, PRIMARY KEY(c2, c1) ) PARTITION BY KEY() # Use primary key as partitioning key PARTITIONS 2; SELECT * FROM t1 WHERE c2 = 2 AND c1 <> 2; This issue is resolved by ensuring that partition pruning skips any remaining partitioning key columns once a partition key column that cannot be used in pruning is encountered. (Bug #14342883) * Partitioning: The buffer for the row currently read from each partition used for sorted reads was allocated on open and freed only when the partitioning handler was closed or destroyed. For SELECT statements on tables with many partitions and large rows, this could cause the server to use excessive amounts of memory. This issue has been addressed by allocating buffers for reads from partitioned tables only when they are needed and freeing them immediately once they are no longer needed. As part of this fix, memory is now allocated for reading from rows only in partitions that have not been pruned (see Section 17.4, "Partition Pruning"). (Bug #13025132) References: See also Bug #11764622, Bug #14537277. * Replication: Updates writing user variables whose values were never set on a slave while using --replicate-ignore-table could cause the slave to fail. (Bug #14597605) References: This bug was introduced by Bug #14275000. * Replication: Using COM_BINLOG_DUMP_GTID with incorrect data could cause the server to crash. (Bug #14509140) * Replication: An internal routine in the MySQL Replication code removed elements from a hash used to store a mapping between databases and worker threads at the same time that the hash was being iterated over. This could cause an unintended reordering of the has elements and thus possibly to incorrect results from routines using this hash. (Bug #14381701) References: See also Bug #13864642. * Replication: The names of the binary log and relay log Performance Schema mutexes were mistakenly changed to names that differed from the MySQL 5.5 names. The names have been reverted to those used in MySQL 5.5. (Bug #14366314) * Replication: When setting up replication between a master and a slave which was using --master-info-repository=TABLE, the mysql.slave_master_info table was not updated the first time that START SLAVE was issued. (Bug #14298750) References: See also Bug #13858841. * Replication: The --disable-gtid-unsafe-statements option caused any nontransactional DML statement involving temporary tables to be rejected with an error even with binlog_format set explicitly to ROW, in spite of the fact that they are not written to the binary log in this case. Now, such statements are allowed when using row-based logging, as long as any nontransactional tables affected by the statements are also temporary tables. (Bug #14272627) * Replication: When using multithreaded slaves, --replicate-rewrite-db rules were not honored while assigning databases to slave worker threads, which could cause statements to be executed out of order when this option was used. This could result in a slave that was inconsistent with the master. (Bug #14232958) * Replication: mysql_upgrade failed when the server was running with gtid_mode=ON and --disable-gtid-unsafe-statements because the MySQL system tables are stored using MyISAM. This problem is fixed by changing the default logging behavior for mysql_upgrade; logging is now disabled by default. (Actions taken by mysql_upgrade depend on the server version, and thus should not be replicated to slaves.) To enable logging, you can execute mysql_upgrade using the --write-binlog option. (Bug #14221043, Bug #13833710) * Replication: The initialization and usage of a number of internal programming objects relating to GTIDs did not work properly with PERFORMANCE_SCHEMA. (Bug #14152637) * Replication: The scheduler for multi-threaded slaves did not take into account databases implicitly involved in operations through foreign key dependencies, which could lead to a temporary loss of consistency on the slave. To avoid this problem, replication events on the master that invoke foreign key relationships between table is different databases are now marked in such a way that they can be scheduled sequentially to avoid race conditions and thereby inconsistency. However, this can adversely affect performance. (Bug #14092635) * Replication: On 64-bit Windows platforms, values greater than 4G for the max_binlog_cache_size and max_binlog_stmt_cache_size system variables were truncated to 4G. This caused LOAD DATA INFILE to fail when trying to load a file larger than 4G in size, even when max_binlog_cache_size was set to a value greater than this. (Bug #13961678) * Replication: It was possible for the multithreaded slave coordinator to leak memory when the slave was stopped while waiting for the next successful job to be added to the worker queue. (Bug #13635612) * Replication: The Master_id column of the mysql.slave_master_info and mysql.slave_relay_log_info tables showed the slave's server ID instead of the master's server ID. (Bug #12344346) * Replication: Statements such as UPDATE ... WHERE primary_key_column = constant LIMIT 1 are flagged as unsafe for statement-based logging, despite the fact that such statements are actually safe. In cases where a great many such statements were run, this could lead to disk space becoming exhausted do to the number of such false warnings being logged. To prevent this from happening, a warning suppression mechanism is introduced. This warning suppression acts as follows: Whenever the 50 most recent ER_BINLOG_UNSAFE_STATEMENT warnings have been generated more than 50 times in any 50-second period, warning suppression is enabled. When activated, this causes such warnings not to be written to the error log; instead, for each 50 warnings of this type, a note is written to the error log stating The last warning was repeated N times in last S seconds. This continues as long as the 50 most recent such warnings were issued in 50 seconds or less; once the number of warnings has decreased below this threshold, the warnings are once again logged normally. The fix for this issue does not affect how these warnings are reported to MySQL clients; a warning is still sent to the client for each statement that generates the warning. This fix also does not make any changes in how the safety of any statement for statement-based logging is determined. (Bug #11759333, Bug #51638) References: See also Bug #11751521, Bug #42415. * ALTER TABLE ... DROP FOREIGN KEY that did not name the foreign key to be dropped caused a server crash. Now the foreign key name is required. (Bug #14530380) * In-place ALTER TABLE operations for InnoDB tables could raise an assertion attempting to acquire a lock. (Bug #14516798) * mysql_secure_installation did not work if old_passwords was set to 2 (use the sha256_password authentication plugin). (Bug #14506073) * Polygons with holes could cause a server crash for spatial operations. (Bug #14497827) * For complex conditions, the optimizer could produce an incorrect range construction and return incorrect query results. (Bug #14497598) * Item_cache_str::save_in_field() dereferenced a null pointer if the cached value was NULL. (Bug #14501403) * The optimizer could raise an assertion when grouping and sorting in descending order on an indexed column. (Bug #14498999) * A query with GROUP BY ... WITH ROLLUP comparing a grouping column using the IN operator caused an assertion to be raised. (Bug #14500792) * In debug builds, with semi-join enabled, GROUP BY ... WITH ROLLUP that did not use a temporary table could cause a server crash. (Bug #14499409) * An assertion was raised when using the join cache for a query that contained an IN subquery query with a subquery that is expected to return a single row but returned more than one. (Bug #14499331) * In mysql_com.h, the CLIENT_CONNECT_ATTRS and CLIENT_PLUGIN_AUTH_LENENC_CLIENT_DATA symbols incorrectly were defined as the same value. (Bug #14482472) * The Threads_running status variable was not updated properly. (Bug #14471011) * GROUP_CONCAT() with DISTINCT or ORDER BY on GEOMETRY values caused a server crash. (Bug #14468106) * With a password policy of STRONG and a password of 100 characters or more, VALIDATE_PASSWORD_STRENGTH() could cause a server crash. (Bug #14458293) * PASSWORD(NULL) and OLD_PASSWORD(NULL) could cause a server crash. (Bug #14458217) * The explicit_defaults_for_timestamp system variable was not visible (for example, with SHOW VARIABLES), so it was not possible to make runtime decisions based on its value. (Bug #14409088) * An ALTER TABLE for an InnoDB table that attempted to add an index and also change the nullability of a column participating in that index raised an assertion. (Bug #14404635) * For debug builds, if one session used a DDL statement to alter an InnoDB table, another session could raise an assertion failure if it had a pre-alter consistent snapshot of the table. (Bug #14365043) * The --server-public-key option for mysql and mysqltest has been renamed to --server-public-key-path to reflect that it refers to a file and for consistency with related server-side variable naming. Also, this option now is available only if MySQL was built with OpenSSL (not yaSSL) because yaSSL does not support the necessary RSA encryption. (Bug #14348721) * The result set could contain extra rows for queries on MyISAM tables that used the SQL_BUFFER_RESULT modifier and a subquery. (Bug #14348858) * The RPM spec file now also runs the test suite on the new binaries, before packaging them. (Bug #14318456) * Inside a stored program, references to stored program variables in XML functions such as ExtractValue() failed after the first execution of the stored program. (Bug #14317442) * The Performance Schema used listed the nanosecond timer by default for stages and statements in the setup_timers table. But if this timer was not available on a given platform (such as Windows), timing for stages and statements failed to work. Now the idle, stage, and statement timers used the preferred timers if they are available, but alternate timers if not. (Bug #14298586) * Some queries for which the optimizer used index condition pushdown in conjunction with ref access could be very slow if the index was read in descending order. (Bug #14287654, Bug #14503142) * A LooseScan semi-join could return duplicate rows from the outer table. (Bug #14271594) * Queries executed using MaterializeScan semi-join strategy and a materialized subquery could return too many rows. (Bug #14272788) * The Performance Schema generated different digests for a statement before and after selecting a database. (Bug #14256311) * The Performance Schema digest-generation code could fail with a race condition. (Bug #14250296) * The server did not build with gcc 4.7. (Bug #14238406) * An optimizer trace could crash attempting to print freed subquery items. (Bug #14238404) * With semi-join optimization enabled, subqueries in the WITH CHECK OPTION clause of view definitions were evaluated incorrectly. (Bug #14230177) * ALTER SERVER, CREATE SERVER, and DROP SERVER with an empty server name caused a server crash. (Bug #14220942) * If a call to socket() failed, the Performance Schema created instrumentation for it anyway. (Bug #14209598) * REQUIRE ISSUER clauses for GRANT statements were not rewritten properly for logging and caused a server crash. (Bug #14211069) * WEIGHT_STRING() could crash if given a bad flags argument. (Bug #14211236) * ALTER TABLE with DISCARD TABLESPACE or IMPORT TABLESPACE did not acquire a sufficiently strong metadata lock to prevent a concurrent ALTER TABLE statement with ADD or DROP from modifying the tablespace. This could result in warnings or raise an assertion. (Bug #14213236) * Some queries with a HAVING clause with a function that referred to a function in the WHERE list with a subquery as parameter caused an assertion to be raised. (Bug #14209318) * String allocation could cause Valgrind warnings. (Bug #14201818) * For queries that used range access, the optimizer could read uninitialized data, resulting in Valgrind warnings. (Bug #14200538) * mysql_upgrade did not set the STATS_PERSISTENT=0 table option for InnoDB tables in the mysql database. (Bug #14195056) * In debug builds, the optimizer raised an unnecessary (too strict) assertion about MyISAM key lengths. (Bug #14179461) * Join processing could attempt to clean up a temporary table that had not been instantiated, causing a server crash. (Bug #14168270) * For JSON-format EXPLAIN statements, derived tables were not handled properly and caused a server crash. (Bug #14167499) * Incorrect internal conversion of string-format dates could cause a server crash. (Bug #14167911) * In debug builds, comparisons for strings that had the ucs2_unicode_520_ci collation could raise an assertion. (Bug #14161973) * In-place ALTER TABLE did not work for a table with a GEOMETRY column, even if the alteration did not involve that column. (Bug #14140927) * For nonexistent files, the Performance Schema file I/O instrumentation sometimes did extra work or was subject to instrumentation leaks. (Bug #14113704) * Small sort_buffer_size values could result in a server crash. (Bug #14111180) * Within a trigger, references to a temporary table used during the query execution process could end up pointing to nonexisting fields on subsequent executions, causing a server crash. (Bug #14105951) * Negative values could be erroneously reported for some columns in the buffer_pool_pages_in_flush row in the information_schema.innodb_metrics table. (Bug #14090287) * The FirstMatch strategy for semi-joins produced incorrect results for some queries with multiple inner tables. (Bug #14081638) * JSON-format EXPLAIN statements could raise an assertion or cause the server to hang for statements with an impossible-WHERE clause and subqueries in ORDER BY or GROUP BY clauses. (Bug #14084642) * With materialization and semi-joins enabled, some queries with an OR condition could produce incorrect results. (Bug #14075016) * Improper error handling for CREATE SERVER, DROP SERVER, and ALTER SERVER could raise an assertion. (Bug #14061851) * RELEASE SAVEPOINT did not have sufficient checks for the XA transaction state to prevent a savepoint from being released while the transaction was in a prepared state. (Bug #14062726) * The libmysqlclient_r client library exported symbols from yaSSL that conflict with OpenSSL. If a program linked against that library and libcurl, it could crash with a segmentation fault. (Bug #14068244) * In-place ALTER TABLE did not handle autopartitioning storage engines such as NDB. (Bug #14063233) * Improper initialization by spatial functions could cause a server crash the first time they were invoked following server startup. (Bug #14015762) * For JSON-format EXPLAIN statements, improper handling of subqueries could cause an assertion to be raised. (Bug #13956275) * SELECT on a partitioned table that used a join buffer could cause a server crash. (Bug #13949549) * Polygon sorting by spatial functions could be done incorrectly and cause a server crash. (Bug #13938850) * For DELETE statements, WHERE clause row retrieval that should access only the index tree could raise an assertion. (Bug #13919180) * The argument for LIMIT must be an integer, but if the argument was given by a placeholder in a prepared statement, the server did not reject noninteger values such as '5'. (Bug #13868860) * Some arguments could cause ST_Buffer() to crash. (Bug #13832749, Bug #13833019) * Queries that used the ST_Contains and Within() functions yielded incorrect results when argument columns had a spatial index. (Bug #13813064) * CHECK TABLE and REPAIR TABLE could crash if a key definition differed in the .frm and .MYI files of a MyISAM table. Now the server produces an error. (Bug #13555854) * The optimizer used a full index scan for cases for which a loose index scan was preferable. (Bug #13464493) References: This bug is a regression of Bug #12540545. * COUNT(DISTINCT(SELECT 1)) could be evaluated incorrectly if the optimizer used a loose index scan. (Bug #13444084) * A query for a FEDERATED table could return incorrect results when the underlying table had a compound index on two columns and the query included an AND condition on the columns. (Bug #12876932) * mysqlhotcopy failed for databases containing views. (Bug #62472, Bug #13006947, Bug #12992993) * "Illegal mix of collation" errors were returned for some operations between strings that should have been legal. (Bug #64555, Bug #13812875) * The ST_Contains() and Within() functions yielded an incorrect result when used on a column with a SPATIAL index. (Bug #65348, Bug #14096685) * If the server was started with secure_auth disabled, it did not produce a warning that this is a deprecated setting. (Bug #65462, Bug #14136937) * The GeomFromWKB() function did not return NULL if the SRID argument was NULL, and non-NULL SRID values were not included in the converted result. (Bug #65094, Bug #13998446) * With statement-based binary logging, stored routines that accessed but did not modify tables took too strong a lock for the tables, unnecessarily blocking other statements that also accessed those tables. (Bug #62540, Bug #13036505) * For some queries, the optimizer used index_merge access method when this was more work than ref access. (Bug #65274, Bug #14120360) * In prepared statements, MYSQL_TYPE_DATE parameters when converted to an integer were handled as MYSQL_TYPE_DATETIME values and the conversion produced incorrect results. (Bug #64667, Bug #13904869) * The argument to the --ssl-key option was not verified to exist and be a valid key. The resulting connection used SSL, but the key was not used. (Bug #62743, Bug #13115401) * In-place ALTER TABLE incorrectly handled indexes using key prefixes by using a copy algorithm. (Bug #65865, Bug #14304973) * Starting the server with --bind-address=* is supposed to cause the server to accept TCP/IP connections on all server host IPv6 and IPv4 interfaces if the server host supports IPv6, or TCP/IP connections on all IPv4 addresses otherwise. But the server sometimes did not correctly detect when IPv6 was not supported, and failed to start. (Bug #66303, Bug #14483430) * Internal temporary MyISAM tables were unnecessarily registered in an open-table list protected by a global mutex, causing excessive mutex contention. (Bug #65077, Bug #14000697) * Queries with ALL over a UNION could return an incorrect result if the UNION result contained NULL. (Bug #65902, Bug #14329235) * In debug builds, an InnoDB assertion was overly aggressive about prohibiting an open range. (Bug #66513, Bug #14547952) * Adding a LIMIT clause to a query containing GROUP BY and ORDER BY could cause the optimizer to choose an incorrect index for processing the query, and return more rows than required. (Bug #54599, Bug #11762052) * ALTER TABLE operations that changed a column definition could cause a loss of referential integrity for columns in a foreign key. (Bug #46599, Bug #11754911) * mysqlbinlog did not accept input on the standard input when the standard input was a pipe. (Bug #49336, Bug #11757312) * There was a performance regression for queries that used GROUP BY and COUNT(DISTINCT). (Bug #49111, Bug #11757108) * mysqldump could dump views and the tables on which they depend in such an order that errors occurred when the dump file was reloaded. (Bug #44939, Bug #11753490) * The ALTER USER statement cleared the user password in the mysql.user table. It no longer does this.
|MySQL Community Server 5.6.7 has been released||4541||Bjorn Munch||09/29/2012 10:20AM|
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