A known limitation of this release:
If you have
InnoDB tables with full-text
search indexes and you are upgrading from MySQL 5.6.10 to a
MySQL version up to and including MySQL 5.6.18, the server
will fail to start after the upgrade (Bug#72079). This bug is
fixed in MySQL 5.6.19. As a workaround, remove full-text
search indexes prior to upgrading and rebuild full-text search
indexes after the upgrade is completed.
Incompatible Change: The
NO_ZERO_IN_DATESQL modes now are deprecated and setting the
sql_modevalue to include any of them generates a warning. In MySQL 5.7, these modes do nothing. Instead, their effects are included in the effects of strict SQL mode (
STRICT_TRANS_TABLES). The motivation for the change in MySQL 5.7 is to reduce the number of SQL modes with an effect dependent on strict mode and make them part of strict mode itself.
To make advance preparation for an upgrade to MySQL 5.7, see SQL Mode Changes in MySQL 5.7. That discussion provides guidelines to assess whether your applications will be affected by the SQL mode changes in MySQL 5.7.
block_encryption_modesystem 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.
init_vectorargument provides an initialization vector for encryption modes that require it:
A random string of bytes to use for the initialization vector can be produced by calling the new
For more information, see Encryption and Compression Functions.
These changes make statements that use
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.
InnoDB: Online DDL support is extended to the following operations for regular and partitioned
On Solaris, mysql_config --libs now includes
-Rso that libraries can be found at runtime. (Bug #18235669)
mysql_install_db provides a more informative diagnostic message when required Perl modules are missing. (Bug #69844, Bug #18187451)
ALTER TABLEis now deprecated and will be removed in a future version of MySQL.
ALTER IGNORE TABLEcauses problems for replication, prevents online
ALTER TABLEfor unique index creation, and causes problems with foreign keys (rows removed in the parent table).
Incompatible Change: Old clients (older than MySQL 5.5.7) failed to parse authentication data correctly if the server was started with the
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_passwordplugin, nor can 5.6.17 clients connect to a 5.6.16 server. Similarly, MySQL 5.7.3 clients cannot connect to a 5.7.4 server using an account that authenticates with the
InnoDB: Running a
SELECTon a partitioned table caused a memory access violation in
memcpy(). (Bug #18383840)
References: See also: Bug #18167648.
InnoDB: For full-text queries, a failure to check that
num_tokenis less than
max_proximity_itemcould result in an assertion. (Bug #18233051)
InnoDB: An invalid
fts_query_fetch_documentwould cause a serious error. (Bug #18229433)
innodb_ft_result_cache_limitnow 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)
UPDATEresulted 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)
InnoDBfailed 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: 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)
References: This issue is a regression of: Bug #14329288.
InnoDB: The maximum value for
innodb_thread_sleep_delayis 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_delayis 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_delayis now the same as the maximum value for
innodb_adaptive_max_sleep_delay. (Bug #18117322)
InnoDB: Attempting to uninstall the
InnoDBmemcached plugin while the
InnoDBmemcached plugin is still initializing would kill the
InnoDBmemcached daemon thread. Uninstall should wait until initialization is complete. (Bug #18038948)
InnoDB: A full-text tokenizer thread would terminate with an incorrect error message. (Bug #18021306)
InnoDB: In debug builds, creating a unique index on a binary column, with input data containing duplicate keys, would cause an assertion. (Bug #18010711)
srv_monitor_threadwould crash in the
lock_print_info_summary()function due to a race condition between the
srv_monitor_threadand purge coordinator thread. (Bug #17980590, Bug #70430)
InnoDB: Attempting to add an invalid foreign key when foreign key checking is disabled (
foreign_key_checks=0) would cause a serious error. (Bug #17666774)
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_updatefunction. For normal builds, a
DB_PRODUCTIONerror would be returned. (Bug #17661919)
InnoDB: When creating a table there are a minimum of three separate inserts on the
mysql.innodb_index_statstable. To improve
CREATE TABLEperformance, there is now a single
COMMIToperation 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: Server shutdown would result in a hang with the following message written to the error log: “
[NOTE] InnoDB: Waiting for purge thread to be suspended.” (Bug #16495065)
InnoDBfailed to start when
innodb_data_file_pathspecified the data file size in kilobytes by appending
Kto the size value. (Bug #16287752)
InnoDB: An insert buffer merge would cause an assertion error due to incorrectly handled ownership information for externally stored BLOBs.
InnoDB: Assertion failure in thread
thread_numin file ibuf0ibuf.cc line 4080 InnoDB: Failing assertion: rec_get_deleted_flag(rec, page_is_comp(page))
InnoDB: Decreasing the
auto_increment_incrementvalue would have no affect on the next auto-increment value. (Bug #14049391, Bug #65225)
Partitioning: When the
index_merge_intersectionflag (enabled by default) or the
index_merge_unionflag was enabled by the setting of the
optimizer_switchsystem variable, queries returned incorrect results when executed against partitoned tables that used the
MyISAMstorage engine, as well as partitioned
InnoDBtables that lacked a primary key. (Bug #18167648)
References: See also: Bug #16862316, Bug #17588348, Bug #17648468.
MASTER_SSL_CRLPATHoptions are not available when using yaSSL; MySQL Replication now sets these to
NULLautomatically whenever yaSSL is enabled. (Bug #18165937)
--slave-parallel-workersto 1 or greater and starting the slave caused the slave SQL thread to use but not release memory until the slave was restarted with
START SLAVE. (Bug #18001777, Bug #71197)
Replication: When a slave was configured with replication filters and
--log-warnings=2, every statement which was filtered caused an entry to be written in the error log. For busy servers which generated many statements to be filtered, the result was that the error log could quickly grow to many gigabytes in size. Now a throttle is used for such errors, so that an error message is printed only once in a given interval, saying that this particular error occurred a specific number of times during that interval. (Bug #17986385)
SHOW SLAVE STATUSused incorrect values when reporting
MASTER_SSL_CRLPATH. (Bug #17772911, Bug #70866)
References: This issue is a regression of: Bug #11747191.
Replication: Binary log events could be sent to slaves before they were flushed to disk on the master, even when
sync_binlogwas set to 1. This could lead to either of those of the following two issues when the master was restarted following a crash of the operating system:
Replication cannot continue because one or more slaves are requesting replicate events that do not exist on the master.
Data exists on one or more slaves, but not on the master.
Such problems are expected on less durable settings (
sync_binlognot equal to 1), but it should not happen when
sync_binlogis 1. To fix this issue, a lock (
LOCK_log) is now held during synchronization, and is released only after the binary events are actually written to disk. (Bug #17632285, Bug #70669)
Replication: When running the slave with
--slave-parallel-workersat 1 or greater, setting
--slave-skip-errors=allcaused the error log to be filled with instances of the warning Slave SQL: Could not execute Query event. Detailed error: ;, Error_code: 0. (Bug #17581990, Bug #68429)
References: See also: Bug #17986385.
Replication: A number of possible state messages used as values for the
PROCESSLIST_STATEcolumn of the
threadsPerformance Schema table were longer than the width of the column (64 characters).
The long state messages are now silently truncated in order to avoid errors. This fix applies in MySQL 5.6 only; a permanent fix for the issue is made in MySQL 5.7 and later. (Bug #17319380)
Replication: The server did not handle correctly the insertion of a row larger than 4 GB when using row-based replication. (Bug #17081415)
Replication: When using row-based replication, an additional auto-increment column on the slave version of a table was not updated correctly; a zero was inserted instead. (Bug #17066269, Bug #69680)
Replication: Statements involving the Performance Schema tables should not be written to the binary log, because the content of these tables is applicable only to a given MySQL Server instance, and may differ greatly between different servers in a replication topology. The database administrator should be able to configure (
DELETE) or flush (
TRUNCATE TABLE) performance schema tables on a single server without affecting others. However, when replicating from a MySQL 5.5 master to a MySQL 5.5 or later slave, warnings about unsafe statements updating Performance Schema tables were elevated to errors. For MySQL 5.6 and later slaves, this prevented the simultaneous use of
performance_schemaand GTIDs (see Replication with Global Transaction Identifiers).
This fix causes all updates on tables in the
performance_schemadatabase to be filtered on the master and not replicated, regardless of the type of logging that is in effect. Prior to this fix, statements using were handled by being marked as unsafe for replication, which caused warnings during execution; the statements were nonetheless written to the binary log, regardless of the logging format in effect.
Existing replication behavior for tables in the
INFORMATION_SCHEMAdatabase is not changed by this fix.
For more information, see MySQL Performance Schema. (Bug #16814264)
References: See also: Bug #14741537, Bug #18259193.
Replication: Modifying large amounts of data within a transaction can cause the creation of temporary files. Such files are created when the size of the data modified exceeds the size of the binary log cache (
max_binlog_cache_size). Previously, such files persisted until the client connection was closed, which could allow them to grow until they exhausted all available disk space in
tmpdir. To prevent this from occurring, the size of a temporary file created in this way in a given transaction is now reset to 0 when the transaction is committed or rolled back. (Bug #15909788, Bug #18021493, Bug #66237)
Replication: The server checks to determine whether semisynchronous replication has been enabled without a lock, and if this is the case, it takes the lock and checks again. If semisynchronous replication was disabled after the first but prior to the second one, this could cause the server to fail. (Bug #14511533, Bug #66411)
References: See also: Bug #17920923.
Replication: Semisynchronous replication became very slow if there were many dump threads (such as from mysqlbinlog or slave I/O connections) working at the same time. It was also found that semisynchronous master plugin functions were called even when the dump connections did not support semisynchronous replication, which led to locking of the plugin lock as well as wasting time on necessary code.
After this fix, non-semisynchronous dump threads no longer call semisynchronous master functions to observe binary events. (Bug #70218, Bug #17434690)
mysql_install_db could hang while reading
/dev/randomto generate a random
rootpassword. (Bug #18395378)
While printing the server version, the mysql client did not check for buffer overflow in a string variable. (Bug #18186103)
Compilation failed if MySQL was configured with
CFLAGSset to include a
-Werroroption with an argument. (Bug #18173037)
libmysqldembedded server library was not built on Linux. A new
WITH_EMBEDDED_SHARED_LIBRARYCMake option now makes this possible. (Bug #18123048, Bug #16430656, Bug #68559)
Building MySQL from source on Windows using Visual Studio 2008 failed with an identifier not found error due to a regression introduced by the patch for Bug#16249481. (Bug #18057449)
References: This issue is a regression of: Bug #16249481.
On Microsoft Windows, the rw-lock backup implementation for the
my_atomic_*functions was always used. Now, the native Microsoft Windows implementation is used, where available. (Bug #18054042)
When tables are reopened from the table cache and the current thread is not instrumented for the Performance Schema, a table handle was unnecessarily instrumented. (Bug #18047865)
SUM_SORT_MERGE_PASSEScolumn value in the
events_statements_summary_by_digestPerformance Schema table was calculated incorrectly. (Bug #17938255)
events_statements_summary_by_digestPerformance Schema table was full when a statement with a new digest was found, the
Performance_schema_digest_loststatus variable was not incremented. (Bug #17935314)
The audit log plugin could cause a server exit during log file rotation operations when there were many operations happening for multiple connections. (Bug #17930339)
The optimizer could push down a condition when the index did not have the key part present in the condition. (Bug #17814492)
Contraction information in a collation could be mishandled, resulting in incorrect decisions about whether a character is part of a contraction, and miscalculation of contraction weights. (Bug #17760379)
If used to process a prepared
CALLstatement for a stored procedure with
mysql_stmt_store_result()did not properly set the flags required to retrieve all the result sets. (Bug #14492429, Bug #17849978)
Aggregating the results of a subquery in the
FROMclause could produce incorrect results. (Bug #71244, Bug #18014565)
A query that creates a temporary table to find distinct values and has a constant value in the projected list could produce incorrect results. (Bug #70657, Bug #17634335)
When run by
root, mysqld --help --verbose exited with a nonzero error code after displaying the help message. (Bug #70058, Bug #17324415)
A deadlock error occurring during subquery execution could cause an assertion to be raised. (Bug #69969, Bug #17307201)
A temporal literal string without delimiters and more than 14 digits was validated as a
TIMESTAMP/DATETIMEvalue with a two-digit precision fractional seconds part. But fractional seconds should always be separated from other parts of a time by a decimal point. (Bug #69714, Bug #17080703)
For system variables that take a string value,
SETstatements permitted an unquoted value, but values that contained dots were parsed incorrectly and only part of the value was assigned. For example,
SET GLOBAL slow_query_log_file = my_slow.logassigned the value
my_slow. Now such values must be quoted or an error occurs. (Bug #69703, Bug #17075846)
The mysqladmin, mysqlbinlog, mysqlcheck, mysqldump, mysqlimport, mysqlslap, and mysqlshow programs now support a
--secure-authoption that prevents sending passwords to the server in old (pre-4.1) format. This option is enabled by default; use
--skip-secure-authto disable it. (Bug #69051, Bug #16723046)
MySQL client programs from a Community Edition distribution could not connect using SSL to a MySQL server from an Enterprise Edition. This was due to a difference in certificate handling by yaSSL and OpenSSL (used for Community and Enterprise, respectively). OpenSSL expected a blank certificate to be sent when not all of the
--ssl-keyoptions were specified, and yaSSL did not do so. To resolve this, yaSSL has been modified to send a blank certificate when an option is missing. (Bug #68788, Bug #16715064)
Messages written by the server to the error log for LDML collation definition problems were missing the collation name. (Bug #68144, Bug #16204175)
On Windows, mysql_install_db.pl could be run only from within the
bindirectory under the installation directory. (Bug #42421, Bug #11751526)
The msql2mysql, mysql_convert_table_format, mysql_find_rows, mysql_fix_extensions, mysql_setpermission, and mysqlaccess utilities are now deprecated and will be removed in MySQL 5.7. (Bug #27482, Bug #69012, Bug #69014, Bug #69015, Bug #69016, Bug #69017, Bug #11746603, Bug #16699248, Bug #16699279, Bug #16699284, Bug #16699317, Bug #18179576)