Changes in MySQL 5.7.4 (2014-03-31, Milestone 14) Note This is a milestone release, for use at your own risk. Significant development changes take place in milestone releases and you may encounter compatibility issues, such as data format changes that require attention in addition to the usual procedure of running mysql_upgrade. For example, you may find it necessary to dump your data with mysqldump before the upgrade and reload it afterward. Performance Schema Notes * The Performance Schema now instruments prepared statements (for both the binary and text protocols): + Information about prepared statements is available in the prepared_statements_instances table. This table enables inspection of prepared statements used in the server and provides aggregated statistics about them. + The performance_schema_max_prepared_statements_instances system variable controls the size of the table. + The Performance_schema_prepared_statements_lost status variable indicates how many prepared statements could not be insrumented. For more information, see The prepared_statements_instances Table (http://dev.mysql.com/doc/refman/5.7/en/prepared-statements-in stances-table.html). If you upgrade to this release of MySQL from an earlier version, you must run mysql_upgrade (and restart the server) to incorporate these changes into the performance_schema database. Security Notes * Incompatible Change: MySQL deployments installed using RPM packages now are secure by default. The following changes have been implemented as the default deployment characteristics: + The installation process creates only a single root account, 'root'@'localhost', automatically generates a random password for this account, and marks the password expired. The MySQL administrator must connect as root using the random password and use SET PASSWORD to select a new password. (The random password is found in the $HOME/.mysql_secret file.) + Installation creates no anonymous-user accounts. + Installation creates no test database. Those changes are implemented by modifying the default mode of operation for mysql_install_db, which is invoked automatically during RPM installation operations. Therefore, the changes also affect non-RPM installation methods for which you invoke mysql_install_db manually. Because mysql_install_db deployment now is secure by default, the --random-passwords option is unnecessary and has been removed. It has been replaced by the --skip-random-passwords option. You can use this option to explicitly produce a deployment that is not secure by default: + Installation creates a single root account, 'root'@'localhost', that has no password. + A test database is created that is accessible by any user. Note mysql_install_db no longer creates anonymous-user accounts, even with --skip-random-passwords. The mysql_secure_installation program now has a --use-default option, which causes the program to execute noninteractively. It can be used for unattended install operations. * Incompatible Change: MySQL now enables database administrators to establish a policy for automatic password expiration: Any user who connects to the server using an account for which the password is past its permitted lifetime must change the password. The implementation has these components: + The default_password_lifetime system variable defines global password expiration policy. A value of N greater than zero means that passwords have a lifetime of N days. A value of 0 disables automatic password expiration. The default is 360; passwords must be changed approximately once per year. + The mysql.user table has new columns that store expiration policy information for individual accounts: o password_last_changed indicates when the password was last changed. The server uses this column when clients connect to determine whether the password is past its lifetime and must be changed per the expiration policy in effect. o password_lifetime indicates the account password lifetime. A value of N greater than zero means that the password has a lifetime of N days. 0 disables automatic password expiration. NULL (the default) means that the global expiration policy applies. + The ALTER USER statement has new options to set password expiration policy for individual accounts. If you upgrade to this release of MySQL from an earlier version, you must run mysql_upgrade (and restart the server) to incorporate the changes to the mysql.user table. For each account, mysql_upgrade uses the time at which it executes to set the password_last_changed column and sets password_lifetime to NULL. This causes the default global expiration policy to go into effect (passwords have a lifetime of 360 days). For more information, see Password Expiration Policy (http://dev.mysql.com/doc/refman/5.7/en/password-expiration-po licy.html), and ALTER USER Syntax (http://dev.mysql.com/doc/refman/5.7/en/alter-user.html). Functionality Added or Changed * Performance; InnoDB: InnoDB now supports multiple page_cleaner threads for flushing dirty pages from buffer pool instances. A new system variable, innodb_page_cleaners, is used to specify the number of page_cleaner threads. The default value of 1 maintains the pre-MySQL 5.7.4 configuration in which there is only a single page_cleaner thread. This enhancement builds on work completed in MySQL 5.6.2, which introduced a single page cleaner thread to offload buffer pool flushing work from the InnoDB master thread. * Incompatible Change: The AES_ENCRYPT() and AES_DECRYPT() functions now permit control of the block encryption mode and take an optional initialization vector argument: + The new block_encryption_mode system variable controls the mode for block-based encryption algorithms. Its default value is aes-128-ecb, which signifies encryption using a key length of 128 bits and ECB mode. + An optional init_vector argument provides an initialization vector for encryption modes that require it: AES_ENCRYPT(str,key_str[,init_vector]) AES_DECRYPT(crypt_str,key_str[,init_vector]) + A random string of bytes to use for the initialization vector can be produced by calling the new RANDOM_BYTES() function. For more information, see Encryption and Compression Functions (http://dev.mysql.com/doc/refman/5.7/en/encryption-functions.h tml). These changes make statements that use AES_ENCRYPT() or AES_DECRYPT() unsafe for statement-based replication and they cannot be stored in the query cache. Queries that use RANDOM_BYTES() are unsafe for statement-based replication and cannot be stored in the query cache. * Incompatible Change: The deprecated ERROR_FOR_DIVISION_BY_ZERO, NO_ZERO_DATE, and NO_ZERO_IN_DATE SQL modes now do nothing. Instead, their previous effects are included in the effects of strict SQL mode (STRICT_ALL_TABLES or STRICT_TRANS_TABLES). In other words, strict mode now means the same thing as the previous meaning of strict mode plus the ERROR_FOR_DIVISION_BY_ZERO, NO_ZERO_DATE, and NO_ZERO_IN_DATE modes. This change reduces the number of SQL modes with an effect dependent on strict mode and makes them part of strict mode itself. To prepare for the SQL mode changes in this version of MySQL, it is advisable before upgrading to read SQL Mode Changes in MySQL 5.7 (http://dev.mysql.com/doc/refman/5.7/en/sql-mode.html#sql-mode -changes). That discussion provides guidelines to assess whether your applications will be affected by these changes. The deprecated ERROR_FOR_DIVISION_BY_ZERO, NO_ZERO_DATE, and NO_ZERO_IN_DATE SQL modes are still recognized so that statements that name them do not produce an error, but will be removed in a future version of MySQL. To make advance preparation for versions of MySQL in which these modes do not exist, applications should be modified to not refer to those mode names. * InnoDB: InnoDB now supports the Transportable Tablespace (http://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_tra nsportable_tablespace) feature for partitioned InnoDB tables and individual InnoDB table partitions. This enhancement eases backup procedures for partitioned tables and enables copying of partitioned tables and individual table partitions between MySQL instances. For additional information, see Copying Tablespaces to Another Server (Transportable Tablespaces) (http://dev.mysql.com/doc/refman/5.7/en/tablespace-copying.htm l). (Bug #18121824, Bug #70196, Bug #18304194, Bug #71784) * InnoDB: Parameters used to identify an InnoDB pages are replaced by two new classes, and fold value and zip_size value calculations have been optimized. These changes simplify code by reducing the number of page identifier parameters passed to functions. (Bug #18073495) * InnoDB: The Fusion-io Non-Volatile Memory (NVM) file system on Linux provides atomic (http://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_ato mic) write capability, which makes the InnoDB doublewrite buffer (http://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_dou blewrite_buffer) redundant. For system tablespace files (ibdata files (http://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_ibd ata_file)) located on Fusion-io devices that support atomic writes, the InnoDB doublewrite buffer is automatically disabled. (Bug #18069105) * InnoDB: Reverse index leaf page scan has been optimized. btr_pcur_restore_position_func() can now perform optimistic restoration for reverse cursors, which reduces block->mutex contention on the root page, especially for concurrent reverse scans. (Bug #17666170) * InnoDB: A new system variable, innodb_log_write_ahead_size, allows you to configure the write-ahead block size for redo logs to a value that matches the operating system or file system cache block size in order to avoid "read-on-write" for redo log writes. Read-on-write occurs when redo log blocks are not entirely cached to the operating system or file system due to a mismatch between write-ahead block size for redo logs and operating system or file system cache block size. Avoiding read-on-write improves throughput stability for redo log writes. (Bug #17571371) * InnoDB: MySQL now supports rebuilding regular and partitioned InnoDB tables using online DDL (http://dev.mysql.com/doc/refman/5.7/en/innodb-online-ddl.html ) (ALGORITHM=INPLACE) for the following operations: + OPTIMIZE TABLE + ALTER TABLE ... FORCE + ALTER TABLE ... ENGINE=INNODB (when run on an InnoDB table) Online DDL (http://dev.mysql.com/doc/refman/5.7/en/innodb-online-ddl .html) support reduces table rebuild time and permits concurrent DML, which helps reduce user application downtime. For additional information, see Overview of Online DDL (http://dev.mysql.com/doc/refman/5.7/en/innodb-create-ind ex-overview.html). (Bug #13975225) * InnoDB: New global configuration parameters, innodb_status_output and innodb_status_output_locks, allow you to dynamically enable and disable the standard InnoDB Monitor and InnoDB Lock Monitor for periodic output. Previously, enabling and disabling these monitors for periodic output required creating and dropping specially named tables (innodb_monitor and innodb_lock_monitor). For additional information, see InnoDB Monitors (http://dev.mysql.com/doc/refman/5.7/en/innodb-monitors.html). * InnoDB: The InnoDB Tablespace Monitor and InnoDB Table Monitor are removed in MySQL 5.7.4. For the Tablespace Monitor, equivalent functionality will be introduced before the GA release of MySQL 5.7. For the Table Monitor, equivalent information can be obtained from InnoDB INFORMATION_SCHEMA tables. * InnoDB: MySQL now includes a gb18030 character set that supports the China National Standard GB18030 character set. For more information about MySQL character set support, see Character Set Support (http://dev.mysql.com/doc/refman/5.7/en/charset.html). * Replication: The binary log dump thread has been optimized by removing unnecessary reallocation of the send buffer. Previously, memory was allocated then freed for every event sent to the slave, even when this was not strictly necessary. Following this optimization, the MySQL Server can make better use of hardware resources by having the dump thread employ adaptative memory allocation, which can also result in less CPU usage. (Bug #11747349, Bug #31932, Bug #11752288, Bug #43426, Bug #13727951) * Replication: Implemented separate threads for sending and receiving semisynchronous replication acknowledgement signals, so that event streams and ACK streams can be sent and received simultaneously. This should reduce many common delays and thus improve performance with semisynchronous replication in a number of settings. * Replication: It is now possible in many cases to execute CHANGE MASTER TO without first issuing STOP SLAVE. This capability is added by implementing the following changes in the behavior of the CHANGE MASTER TO statement, which now depends only on whether the slave SQL thread or slave I/O thread is stopped, as described here: + If the SQL thread is stopped, you can execute CHANGE MASTER TO using the RELAY_LOG_FILE, RELAY_LOG_POS, and MASTER_DELAY options, even if the slave I/O thread is running. No other options may be used with this statement when the I/O thread is running. + If the I/O thread is stopped, you can execute CHANGE MASTER TO using any of the options for this statement except RELAY_LOG_FILE, RELAY_LOG_POS, or MASTER_DELAY, even when the SQL thread is running. These three options cannot be used when the I/O thread is running. + Both the SQL thread and the I/O thread must be stopped before issuing CHANGE MASTER TO with MASTER_AUTO_POSITION = 1. If you are using statement-based replication and temporary tables, it is possible for a CHANGE MASTER TO statement following a STOP SLAVE statement to leave behind temporary tables on the slave. As part of this set of improvements, a warning is now issued whenever this occurs. You can avoid this in such cases by making sure that Slave_open_temp_tables is equal to 0 prior to executing these statements. For more information, see CHANGE MASTER TO Syntax (http://dev.mysql.com/doc/refman/5.7/en/change-master-to.html) , and Switching Masters During Failover (http://dev.mysql.com/doc/refman/5.7/en/replication-solutions- switch.html). * Performance Schema performance was improved in the following ways: + When a thread connects, reset of all per-thread statistics is now delayed until a statistic is actually collected. This lazy initialization benefits workloads with very short-lived sessions, for which instrumentation is disabled. + When a thread disconnects, the per-thread statistics are aggregated to a parent only for statistics that actually collected data. This optimization benefits workloads with very short-lived sessions, for which instrumentation is disabled. + For statement instrumentation, reset of an individual EVENT_NAME statistic is also now delayed until a statistic is actually collected. This benefits all workloads that contain only a few types of statements (SELECT, INSERT, UPDATE, DELETE, and so forth) from the very large set statements supported in MySQL. Only statements for event names actually executed are aggregated on disconnect. + The memory footprint of internal memory buffers is reduced, by removing some attributes reserved for future use, that were in fact not used. In particular, statistics for mutexes, rwlocks and conditions now need less memory. (Bug #18324285) * On Windows, NOMINMAX is set using the ADD_DEFINITIONS() CMake macro rather than in config.h.cmake so that it is set even without including my_config.h. (Bug #18192896) * On Solaris, mysql_config --libs now includes -R/path/to/library so that libraries can be found at runtime. (Bug #18235669) * CMake support for compiling MySQL with gcc on Solaris was improved. Binary distributions for Solaris now are built using gcc rather than Sun Studio, to enable compilation of code not handled by Sun Studio. The client programs and the client libraries except the embedded library are still built using Sun Studio. A consequence of this change is that on Solaris, mysql_config no longer provides arguments for linking with the embedded library, since this is now built using gcc instead of Sun Studio. To get linking arguments for the embedded library, use the alternative script mysql_server_config instead. (Bug #18146422, Bug #17826757) * The CHECK_FUNCTION_REPLACEMENT() CMake macro was removed from Windows.cmake and replacement functions are set explicitly instead since the result of the check was already hard coded in WindowsCache.cmake. (Bug #18116661) * MySQL now compiles using Clang 3.4. (Bug #18047020) * In MySQL 5.7.1, the MySQL test suite mysql-test-run.pl program was modified to start the server with InnoDB rather than MyISAM as the default storage engine. All tests in the MySQL test suite were modified to include a force_default_myisam.inc file. This had to be done because most legacy test results were recorded with the MyISAM engine and failed with a result difference if run with InnoDB. A project is underway to migrate these tests and remove force_default_myisam.inc for tests that do not need MyISAM. In 5.7.4, the rpl and binlog suites and parts of the main suite were migrated. (Bug #17902011) * Performance Schema instrumentation was added to capture GTIDs for transaction events. (Bug #17799147) * Performance Schema overhead was reduced for the pfs_lock implementation and the uses of atomic operations in general. (Bug #17766582) * CMake now aborts the configuration process on Windows if a Visual Studio version earlier than 2010 is used. (Bug #17730320) * A new CMake option, WITH_MSAN, permits enabling MemorySanitizer for compilers that support it. (Bug #17632319) * Previously, ALTER TABLE in MySQL 5.6 could alter a table such that the result had temporal columns in both 5.5 and 5.6 format. Now ALTER TABLE upgrades old temporal columns to 5.6 format for ADD COLUMN, CHANGE COLUMN, MODIFY COLUMN, ADD INDEX, and FORCE operations. This conversion cannot be done using the INPLACE algorithm, so specifying ALGORITHM=INPLACE in these cases results in an error. (Bug #17246318) * Overhead was reduced for filesort comparison operations. (Bug #14635144) * Overhead was reduced for metadata lock acquisition for DML statements. (Bug #58627, Bug #11765641) * CMake now supports a -DTMPDIR=dir_name option to specify the default tmpdir value. If unspecified, the value defaults to P_tmpdir in <stdio.h>. Thanks to Honza Horak for the patch. (Bug #68338, Bug #16316074) * Based on community feedback, the default value of 10 for the eq_range_index_dive_limit system variable has proven to be too low. The default has been raised to 200. (Bug #70586, Bug #17587952) * Code instrumented with Valgrind did not preallocate memory in alloc_root(), to help find bugs. This behavior is now also enabled if ASAN (address sanitizer) is used. (Bug #44582, Bug #11753184) * mysql_install_db provides a more informative diagnostic message when required Perl modules are missing. (Bug #69844, Bug #18187451) * MySQL now supports server-side timeouts for execution of SELECT statements: + SELECT supports a MAX_STATEMENT_TIME option to specify a timeout for individual queries. For example: SELECT MAX_STATEMENT_TIME = 5000 id, name FROM my_table WHERE ... + The max_statement_time system variable specifies the timeout value for SELECT statements executed within the session that include no MAX_STATEMENT_TIME option. If the value is 0, timeouts are not enabled. + The Max_statement_time_exceeded, Max_statement_time_set, and Max_statement_time_set_failed status variables provide information about SELECT statements affected by timeouts. Timeout values are in milliseconds. For more information, see SELECT Syntax (http://dev.mysql.com/doc/refman/5.7/en/select.html), and Server System Variables (http://dev.mysql.com/doc/refman/5.7/en/server-system-variable s.html). Thanks to Davi Arnaut for the patch on which this feature is based. (Bug #68252, Bug #16271666) * The metadata locking subsystem implementation now uses lock-free hashing rather than a hash protected by a mutex. An implication of this change is that the metadata_locks_cache_size and metadata_locks_hash_instances system variables no longer have any effect, so they are deprecated and will be removed in a future MySQL release. * The deprecated IGNORE clause for ALTER TABLE has been removed and its use produces an error. * The metadata locking subsystem now uses a lock-free algorithm for acquiring and releasing locks typical for DML statements. This gives better performance/scalability on multi-core machines in workloads involving lots of small read-only transactions. * To make it possible to change connections in a load-balanced environment, it is necessary to detect in the response packet whether there is session state to take into consideration when deciding whether a switch can be made. For this purpose, session state consists of these values: + The default schema (database) + Session-specific values for system variables + User-defined variables + Temporary tables + Prepared statements The OK response packet of the MySQL client/server protocol now includes tracker information so that session state changes can be detected. The tracker mechanism provides a means for MySQL Connectors, Fabric, and client applications to determine whether any session context is available to ensure session migration from one server to another. The user interface to control the tracker and retrieve state-change information from it has the following components, which enable implementation of state-change tracking on the client side: + Clients can request notification when there is a change to any of the session state-related values just listed, in the form of a flag that is set in the OK packet received from the server after the change occurs. To control notification, enable or disable the session_track_state_change system variable. This variable is disabled by default. + Clients can request notification of changed values for certain specific types of session state information: o The default schema name. To control notification, enable or disable the session_track_schema system variable. This variable is enabled by default. o The session values of system variables. Notification occurs for the system variables named by the session_track_system_variables system variable. By default, notification is enabled for time_zone, autocommit, character_set_client, character_set_results, and character_set_connection. (The latter three variables are those affected by SET NAMES.) + To enable applications to extract the state-change information returned in the OK packet by the server, the MySQL C API includes a pair of functions: o mysql_session_track_get_first() fetches the first state-change information received from the server. o mysql_session_track_get_next() fetches any remaining state-change information received from the server. Following a successful call to mysql_session_track_get_first(), call this function repeatedly as long as it returns success. + The mysqltest program has enable_session_track_info and disable_session_track_info commands to enable and disable tracking of session state-change information. For more information, see Server System Variables (http://dev.mysql.com/doc/refman/5.7/en/server-system-variable s.html) and mysql_session_track_get_first() (http://dev.mysql.com/doc/refman/5.7/en/mysql-session-track-ge t-first.html). For information about the structure of the OK packet itself, see OK_Packet (http://dev.mysql.com/doc/internals/en/packet-OK_Packet.html). * MySQL Yum Repository: mysqlbug (http://dev.mysql.com/doc/refman/5.7/en/mysqlbug.html), an obsolete program for generating bug reports, has been removed from the RPM packages delivered by the MySQL Yum Repository for installing the MySQL Server on EL5, EL6, and EL7-based platforms. Bugs Fixed * Incompatible Change: Old clients (older than MySQL 5.5.7) failed to parse authentication data correctly if the server was started with the --default-authentication-plugin=sha256_password option. Note As a result of this bug fix, MySQL 5.6.16 clients cannot connect to a 5.6.17 server using an account that authenticates with the sha256_password plugin. Similarly, MySQL 5.7.3 clients cannot connect to a 5.7.4 server using an account that authenticates with the sha256_password plugin. (Bug #17495562) * Important Change; InnoDB; Partitioning: The FLUSH TABLES statement's FOR EXPORT option is now supported for partitioned InnoDB tables. (Bug #16943907) * InnoDB; Replication: Using the InnoDB memcached plugin (see InnoDB Integration with memcached (http://dev.mysql.com/doc/refman/5.7/en/innodb-memcached.html) ) with innodb_api_enable_binlog set to 1 caused the server to leak memory. (Bug #70757, Bug #17675622) * InnoDB: trx_undo_truncate_start would write to the redo log for temporary undo log segments, resulting in a purge thread assertion. (Bug #18252937) * InnoDB: A !sync_check_iterate(check) assertion occurred in fts_create_doc_id() during an INSERT operation. (Bug #18253210) * InnoDB: The GCC 4.4 Compiler would emit a bogus warnings about InnoDB parsing functions, indicating that output is uninitialized. (Bug #18192536) * InnoDB: log_mutex_exit should be called before log_buffer_extend when the log buffer mutex is held. (Bug #18202904) * InnoDB: InnoDB would write to the redo log for some operations on temporary tablespaces. (Bug #18226934) * InnoDB: Doublewrite buffer error messages referenced page numbers in an inconsistent manner. (Bug #18242594) * InnoDB: The truncate_t::drop_indexes and truncate_t::create_indexes methods would disable redo logging when modifying the system tablespace. (Bug #18236000) * InnoDB: Unused parameters and variables along with disabled functionality has been removed from redo log code. This patch also includes redo log code improvements including test enablement, addition of Valgrind instrumentation, and minor code refactoring. (Bug #18251675) * InnoDB: An invalid memmove in fts_query_fetch_document would cause a serious error. (Bug #18229433) * InnoDB: For full-text queries, a failure to check that num_token is less than max_proximity_item could result in an assertion. (Bug #18233051) * InnoDB: InnoDB would perform unnecessary redo log writes and flushing for temporary tablespaces. (Bug #18236692) * InnoDB: The user defined type, xid_t, was defined multiple times. (Bug #18251254) * InnoDB: To simplify code and reduce memory usage, InnoDB redo log scan records for file-level operations, previously stored in a hash table, are now processed immediately. (Bug #18180875) * InnoDB: The loader in some Solaris versions would refuse to start a GCC-compiled binary (such as the mysqld binary) that uses the PAUSE assembler instruction. (Bug #18122171) * InnoDB: Temporary tablespace file size did not match the file size specified by --innodb-temp-data-file-path due to an error in file size allocation logic. (Bug #18141070) * InnoDB: innodb_ft_result_cache_limit now has a hardcoded maximum value of 4294967295 bytes or (2**32 -1). The maximum value was previously defined as the maximum value of ulong. (Bug #18180057, Bug #71554) * InnoDB: InnoDB would fail to restore a corrupt first page of a system tablespace data file from the doublewrite buffer, resulting in a startup failure. (Bug #18144349, Bug #18058884) * InnoDB: An UPDATE resulted in a memory access error in lock_rec_other_trx_holds_expl. The transaction list (trx_sys->rw_trx_list) was traversed without acquiring the transaction subsystem mutex (trx_sys->mutex). (Bug #18161853) * InnoDB: TRUNCATE TABLE on Windows would report multiple 'chsize' returned OS error 71 errors. (Bug #18176071, Bug #71173) * InnoDB: A regression introduced by Bug #14329288 would result in a performance degradation when a compressed table does not fit into memory. (Bug #18124788, Bug #71436) * InnoDB: In the case of a corrupted clustered index on a temporary table, the server would crash on an INSERT instead of returning an error. In the case of a corrupted clustered index on a normal table, an error was not returned and the INSERT would succeed. (Bug #18064548) * InnoDB: Specifying an alternate directory for InnoDB tables using datadir and then moving .ibd files (http://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_ibd _file) to the default MySQL data directory would result in a serious error when attempting a DROP TABLE operation. (Bug #18063570) * InnoDB: The UNIV_LOG_DEBUG debug flag, which is no longer fully functional, has been removed. (Bug #18080537) * InnoDB: A compilation error (unable to find string literal operator) was returned when building in c++11 mode. (Bug #18082139) * InnoDB: INFORMATION_SCHEMA.INNODB_TRX contained a bogus transaction ID that did not match transaction ID values printed elsewhere. The method used to retrieve transaction IDs was inconsistent. (Bug #18111007) * InnoDB: The maximum value for innodb_thread_sleep_delay is now 1000000 microseconds. The previous maximum value (4294967295 microseconds on 32-bit and 18446744073709551615 microseconds on 64-bit) was unnecessarily large. Because the maximum value of innodb_thread_sleep_delay is limited by the value set for innodb_adaptive_max_sleep_delay (when set to a non-zero value), the maximum value for innodb_thread_sleep_delay is now the same as the maximum value for innodb_adaptive_max_sleep_delay. (Bug #18117322) * InnoDB: The fil_node_create function would perform an unnecessary hash table lookup. (Bug #18116588) * InnoDB: When starting the server, unnecessary "checking space" log messages would be printed when processing the doublewrite buffer (http://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_dou blewrite_buffer). (Bug #18101380) * InnoDB: A full-text tokenizer thread would terminate with an incorrect error message. (Bug #18021306) * InnoDB: Attempting to uninstall the InnoDB memcached plugin while the InnoDB memcached plugin is still initializing would kill the InnoDB memcached daemon thread. Uninstall should wait until initialization is complete. (Bug #18038948) * InnoDB: In debug builds, creating a unique index on a binary column, with input data containing duplicate keys, would cause an assertion. (Bug #18010711) * InnoDB: Logging functions were not used consistently. The bug fix replaces occurrences of fprintf(stderr, message) and fputs() with ib_logf(). Also, because ib_logf() emits a timestamp with each message, the bug fix removes unnecessary occurrences of ut_print_timestamp(). (Bug #17935793, Bug #17534737) * InnoDB: A boolean mode full-text search query would result in a memory access violation during parsing. (Bug #17978763) * InnoDB: The srv_monitor_thread would crash in the lock_print_info_summary() function due to a race condition between the srv_monitor_thread and purge coordinator thread. (Bug #17980590, Bug #70430) * InnoDB: On Windows, a regression introduced in 5.7.3 would allow log writes during sync operations, which should not be allowed due to an issue in some Windows environments. (Bug #17824101) * InnoDB: Due to a parser error, full-text search queries that include a sub-expression could return the wrong result. (Bug #17840768) * InnoDB: The innochecksum tool did not use a Windows-specific API to retrieve file size information, which resulted in an incorrect error message (Error: ibdata1 cannot be found) when the MySQL 5.6 innochecksum 2GB file size limit was exceeded. innochecksum now provides support for files larger than 2GB in both MySQL 5.6 and MySQL 5.7. (Bug #17810862, Bug #70936) * InnoDB: Due to a regression introduced by the fix for Bug#17371537, memory was not allocated for the default memcached engine when using the default memcached engine as the backstore for data instead of InnoDB. (Bug #17800829) * InnoDB: If a crash occurred while temporary tables are active, InnoDB would report an invalid error message on restart indicating that a temporary table does not exist in the InnoDB internal data dictionary. (Bug #17779729) * InnoDB: A page allocation for an undo log due would fail with a "table is full" error message instead of an "undo log is full" error message. (Bug #17779822) * InnoDB: ut_free could be called more than once in succession. (Bug #17763472) * InnoDB: An index tree modification could result in a deadlock. (Bug #17754767) * InnoDB: Manipulating a table after discarding its tablespace using ALTER TABLE ... DISCARD TABLESPACE could result in a serious error. (Bug #17700280) * InnoDB: A race condition in DebugPolicy::enter() would cause a segmentation fault in sync_array_cell_print. (Bug #17713784) * InnoDB: Persistent optimizer statistics would cause stalls due to latch contention. (Bug #17699331, Bug #70768) * InnoDB: MATCH() ... AGAINST queries that use a long string as an argument for AGAINST() could result in an error when run on an InnoDB table with a full-text search index. (Bug #17640261) * InnoDB: An InnoDB full-text search failure would occur due to an "unended" token. The string and string length should be passed for string comparison. (Bug #17659310) * InnoDB: Databases names beginning with a digit or special character would cause a full-text search (FTS) parser error. (Bug #17607687) References: See also Bug #17607956. * InnoDB: For debug builds, the table rebuilding variant of online ALTER TABLE, when run on tables with BLOB columns, would cause an assertion in the row_log_table_apply_update function. For normal builds, a DB_PRODUCTION error would be returned. (Bug #17661919) * InnoDB: Under certain conditions, a regression introduced by the fix for Bug #11758237 would cause an assertion error when INSERT ... ON DUPLICATE KEY UPDATE or REPLACE statements encounter a DB_DUPLICATE_KEY error. (Bug #17604730) * InnoDB: In debug builds, a merge insert buffer during a page read would cause a memory access violation. (Bug #17561188) * InnoDB: The patch for Bug #16852278, which simplifies and optimizes comparison functions in InnoDB, caused a query performance regression. (Bug #17543588) * InnoDB: Truncating a memcached InnoDB table while memcached is performing DML operations would result in a serious error. (Bug #17468031) * InnoDB: In sync0rw.ic, rw_lock_x_lock_func_nowait would needlessly call os_thread_get_curr_id. (Bug #17509710, Bug #70417) * InnoDB: Attempting to rename a table to a missing database would result in a serious error. (Bug #17447500) * InnoDB: If a tablespace data file path is updated in a .isl file and then a crash recovery is performed, the updated tablespace data file path is read from the .isl file but the SYS_DATAFILES table would not be not updated. The SYS_DATAFILES table is now updated with the new data file path after crash recovery. (Bug #17448389) * InnoDB: The server could fail to restart if a crash occurred immediately following a RENAME TABLE in an ALTER TABLE, RENAME TABLE sequence. (Bug #17463290) * InnoDB: If the first page (page 0) of file-per-table tablespace data file was corrupt, recovery would be halted even though the doublewrite buffer contained a clean copy of the page. (Bug #17335427, Bug #70087) * InnoDB: The InnoDB memcached Readme file (README-innodb_memcached) incorrectly stated that libevent 1.6.0 is linked statically into daemon memcached. The bundled version of libevent is 1.4.12, not 1.6.0. (Bug #17324419, Bug #70034) * InnoDB: Attempting to reset a replication slave while innodb_force_recovery is greater than 0 would return a cryptic error message: ERROR(1030) HY000: Got error -1 from storage engine. The error message has been changed to: ERROR HY000: Operation not allowed when innodb_force_recovery > 0. Replication options such as --relay-log-info-repository=TABLE and --master-info-repository=TABLE store information in tables in InnoDB. When innodb_force_recovery is greater than 0, replication tables cannot be updated which may cause replication administration commands to fail. (Bug #17287443, Bug #69907) * InnoDB: When creating a table there are a minimum of three separate inserts on the mysql.innodb_index_stats table. To improve CREATE TABLE performance, there is now a single COMMIT operation instead of one for each insert. (Bug #17323202, Bug #70063) * InnoDB: The server would halt with an assertion in lock_rec_has_to_wait_in_queue(lock) due to a locking-related issue and a transaction being prematurely removed from trx_sys->rw_trx_set. (Bug #17320977) * InnoDB: The ALTER TABLE INPLACE algorithm would fail to decrease the auto-increment value. (Bug #17250787, Bug #69882) * InnoDB: Comments in btr0cur.cc incorrectly stated that btr_cur_pessimistic_update() and btr_cur_optimistic_update() would accept a NULL value. (Bug #17231743, Bug #69847) * InnoDB: dict_table_schema_check would call dtype_sql_name needlessly. (Bug #17193801, Bug #69802) * InnoDB: The function os_file_get_status would not work with raw devices. (Bug #17023438, Bug #69424) * InnoDB: fil_check_first_page() failed to check if fsp_flags_get_zip_size() returned a valid value, which resulted in a segmentation fault when starting mysqld. (Bug #17033182) * InnoDB: The lock_rec_other_has_expl_req function in lock0lock.cc would perform unnecessary work. (Bug #17016214, Bug #69576) * InnoDB: Valgrind would report uninitialized values while running a rollback debug test. The Valgrind warnings should only appear in Valgrind-instrumented builds. (Bug #16969876) * InnoDB: During crash recovery, an incorrect transaction active time would result in rolling back an uncommitted transaction. (Bug #16936961, Bug #69438) * InnoDB: Heap block debugging information (file_name, lineno), used for logging diagnostics, would appear in release builds. This information should only appear in debug builds. (Bug #16924719, Bug #69422) * InnoDB: Renaming a column while also adding or dropping columns in the same ALTER TABLE operation would cause an error. (Bug #16864981) * InnoDB: An online ALTER TABLE operation would consume more memory than expected. During an online ALTER TABLE operation, an online log buffer containing a head and tail buffer is created for each index that is created or rebuilt. The tail buffer is the writer context and is only required for concurrent write operations on an index while the ALTER TABLE operation is in progress. The head buffer is the reader context and is only required during the log apply phase. To reduce memory consumption, the tail buffer is now allocated when the first DML statement is run on the index, and the head buffer is only allocated in the log apply phase and freed afterwards. (Bug #16868967, Bug #69325, Bug #17911720)[... continued ...]
|MySQL Community Server 5.7.4 has been released (part 1/2)||1088||Bjørn Munch||03/31/2014 10:59AM|
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