option is now deprecated and its use results in a warning. It
will be removed in a future MySQL release. This also applies to
its synonyms (
--disable-innodb, and so forth).
MySQL Enterprise Notes
MySQL Enterprise Edition now includes a set of encryption functions based on the OpenSSL library that expose OpenSSL capabilities at the SQL level. These functions enable Enterprise applications to perform the following operations:
Implement added data protection using public-key asymmetric cryptography
Create public and private keys and digital signatures
Perform asymmetric encryption and decryption
Use cryptographic hashing for digital signing and data verification and validation
For more information, see MySQL Enterprise Encryption Functions.
Functionality Added or Changed
The new variable
can be used to change the way binary log files are searched for
previous GTIDs during recovery, speeding up the process when a
large number of binary log files exist.
(Bug #69097, Bug #16741603, Bug #74071, Bug #19686914)
Internally, spatial data types such as
Geometry are represented as
BLOB values, so when invoked with the
mysqldump now displays spatial values in hex.
(Bug #43544, Bug #11752369)
Large numbers of partitioned
tables could consume much more memory when used in MySQL 5.6 or
5.7 than the memory used by the same tables used in previous
releases of the MySQL Server.
(Bug #17780517, Bug #70641)
References: This bug was introduced by Bug #11764622, Bug #57480.
ALTER TABLE ...
ADD FOREIGN KEY operation could cause a serious error.
(Bug #19471516, Bug #73650)
In debug builds, an
operation affecting compressed tables would raise a sync-related
Retrieval of multiple values with a single
get command would return incorrect results
instead of an error message. The
memcached plugin does not currently support
retrieval of multiple values with a single
(Bug #19172212, Bug #72453)
InnoDB: Attempting to perform operations on a timed out key would cause the memcached daemon to crash and restart. (Bug #19172013, Bug #72586)
With a transaction isolation level less than or equal to
READ COMMITTED, gap locks were not taken when
scanning a unique secondary index to check for duplicates. As a
result, duplicate check logic failed allowing duplicate key
values in the unique secondary index.
References: This bug is a regression of Bug #16133801.
InnoDB: During recovery, a segmentation fault would occur when marking a table as corrupt. (Bug #18942294)
A failed in-place
operation would leave behind non-unique temporary file names in
the data dictionary preventing future
TABLE operations on the same table due to temporary
file name conflicts. To avoid this problem, temporary file names
are made unique by appending a static global number that is
initialized to a random distributed 32-bit number using
The number is then incremented atomically for each assigned
temporary file name. Previously, temporary files were named
using the format
tid is the table ID. Temporary files are now
named using the format
tid is the table ID and
inc is the incremented number.
(Bug #18734396, Bug #72594)
InnoDB: In rare cases, the purge process would attempt to delete a secondary index record that was not marked for deletion, resulting in an inconsistent secondary index. (Bug #18631496)
srv_active_wake_master_thread() was called
innobase_prepare, waking up the master thread
srv_active_wake_master_thread() should only
be called after committing write transactions, not after
read-only transactions or rollbacks. This patch also replaces
some calls to
with calls to
(Bug #18477009, Bug #72137)
ALTER TABLE operation on a table
with a broken foreign key constraint could raise an assertion.
Inserting a record into an
InnoDB table with
a key that falls between the maximum key of a full page and the
minimum key of the “next” page could result in
unnecessary page splits and under-filled pages. If the insert
point is at the end of a page,
attempts to insert to the next page before splitting the page.
(Bug #15923864, Bug #67718)
Replication: After the fix for Bug #16861624, killing a multi-threaded slave worker which was waiting for a commit lock caused a debug assertion to fail. This fix ensures that such a situation can not occur. (Bug #19311260)
When committing a transaction, a flag is now used to check
whether a thread has been created, rather than checking the
thread itself, which uses more resources, particularly when
running the server with
References: See also Bug #17967378.
When using GTIDs with
enabled, if an I/O thread was restarted it failed with an
error due to a partial transaction not being correctly rolled
back before resuming the I/O thread. This fix ensures that the
partial transaction is correctly rolled back.
When mysqlbinlog processed multiple binary
log files into a single output file, this file was not in a
useful state for point-in-time recovery, when it failed with the
error, When @@SESSION.GTID_NEXT is set to a GTID, you
must explicitly set it to a different value after a COMMIT or
ROLLBACK. Please check GTID_NEXT variable manual page for
detailed explanation. Current @@SESSION.GTID_NEXT is
mysqlbinlog processes a binary log containing
GTIDs, it outputs
gtid_next statements, but
gtid_next is set to undefined whenever a
commit occurs; this left
when the server had finished processing the output from
mysqlbinlog. When the next binary log file
started with one or more anonymous statements or transactions,
the combination of gtid_next being left undefined at the end of
the first binary log and the second binary log containing
anonymous transactions to the error described previously (Error
To fix this issue, now, whenever mysqlbinlog
encounters this situation, it inserts
SET gtid_next =
AUTOMATIC if required to avoid leaving the previous
binary log with
In addition, as a result of this fix, mysqlbinlog no longer outputs session variable information for every binary log; now, this value is printed only once unless it changes. (Bug #18258933, Bug #71695)
Replication: When the I/O thread reconnected to a master using GTIDs and multithreaded slaves while in the middle of a transaction, it failed to abort the transaction, leaving a partial transaction in the relay log, and then retrieving the same transaction again. This occurred when performing a rotation of the relay log. Now when reconnecting, the server checks before rotating the log in such cases, and waits first for any ongoing transaction to complete. (Bug #17326020)
CLIENT_REMEMBER_OPTIONS flag for
compressed slave connections is no longer reset and all options
are retained. This restores functionality of all options to
compressed slave connections.
(Bug #72901, Bug #18923691, Bug #73324, Bug #19244772)
When using row-based replication, setting a slave's
HASH_SCAN caused an
ER_KEY_NOT_FOUND error even
though that record existed in the storage layer. This fix
ensures that the unique key for each record is correctly
maintained and such a situation does not occur.
(Bug #72788, Bug #18860225)
Replication: When using row-based replication, running a long transaction involving a large number of events could trigger an Out of Memory (OOM) error if the slave's table structure was not compatible with the master's table structure. Such an incompatible situation could occur if the table on the slave had been manually changed, or when replicating between different MySQL versions that have different data types. This OOM error was caused because the virtual temporary tables created for the row conversion were not being freed until the end of the transaction, which was a problem when replicating large numbers of events.
Starting with this version, such virtual tables are correctly freed during the conversion process. (Bug #72610, Bug #18770469)
References: See also Bug #19692387.
Replication: The error messages generated when a duplicate server UUID causes issues during replication have been improved. The slave error now identifies the duplicate server UUID and the master error identifies the zombie thread that has been killed. (Bug #72578, Bug #18731211)
When an event group was spanned across multiple relay log files,
a slave could incorrectly identify GTID-header group boundaries.
This meant that when a transaction was retried, or if the SQL
thread was stopped in the middle of a transaction after some
Gtid_log_event was being
silently skipped on the slave, and the transaction was logged
with the slave's GTID. This problem also impacted on using
START SLAVE UNTIL MASTER_LOG_POS =
log_pos was in the middle
of a transaction, the
Gtid_log_event was not
correctly detected as the beginning of the transaction and
replication stopped before this event. With this fix, threads
correctly detect that they are part of a group, and this is used
to check if a
Gtid_log_event is part of a
(Bug #72313, Bug #18652178, Bug #18306199)
On a master that is using semisynchronous replication, where
is enabled and
set to long timeout, killing the I/O thread could cause the
server to hang on shutdown. This fix ensures that if the dump
thread finds that there no semisynchronous slaves connected to
the master, the setting of
rpl_semi_sync_master_wait_no_slave is ignored
and the shutdown proceeds correctly.
(Bug #71047, Bug #17879675)
Replication: When using semisynchronous replication, if the binary log position was changed to a future position on a slave then an assertion error was generated on the master. This fix ensures that in such a situation the future position is correctly acknowledged and an error is instead generated on the slave. (Bug #70327, Bug #17453826)
Replication: When an SQL thread which was waiting for a commit lock was killed and restarted it caused a transaction to be skipped on slave. This fix ensures that thread positions are correctly persisted and transactions resume at the correct position. (Bug #69873, Bug #17450876)
With DTrace support enabled, certain other compilation options could cause the build to fail. (Bug #19506247)
yaSSL client code did not validate the encryption size or session ID length, which could cause the client to exit. (Bug #19463277, Bug #19463565)
yaSSL could fail preauthorization if the client supplied inaccurate buffer lengths. (Bug #19370676, Bug #19355577)
Competition between threads could lead to timeout failure trying to rotate the audit log file. (Bug #19184973)
cause a server exit if the pad string argument was not well
The optimizer could create a zero-length column for a temporary table, causing a server exit. (Bug #18928848)
MOD for very small decimal right-hand
arguments could cause a server exit.
The client library now includes a call to
X509_verify_cert_error_string() in the SSL
certificate verification code, to be more robust in detecting
If the left-hand-side of an
IN predicate was
a scalar subquery but returned no row, the server could exit.
(Bug #18223655, Bug #18447874)
variable is deprecated, but no warning resulted from setting it
at server startup.
SIGINT signal to mysql
could result in a
glibc double free or
RPM Bundle tar file distributions did not include the shared compatibility library RPM. (Bug #74611, Bug #19909411)
On EL7, installation of MySQL from RPM packages could fail if
postfix had previously been installed using
(Bug #73507, Bug #19392051, Bug #19392149)
The query cache was not invalidated for a table when a
CASCADE DELETE or
UPDATE referential constraint was specified and the
database name or table name contained special characters.
(Bug #72547, Bug #18710853)
mysql_upgrade could fail if the
mysql.user table contained multiple accounts
with the same user name and host name where the host name
differed in lettercase. This is still not permitted, but now
mysql_upgrade prints a more informative error
message to indicate the nature of the problem:
ERROR 1644 (45000): Multiple accounts exist for
host_namethat differ only in Host lettercase; remove all except one of them
(Bug #72066, Bug #18415196)
Invalid memory access could occur when using prepared statements if a mysql client connection was lost after statement preparation was complete and there was at least one statement that was in initialized state but not prepared yet. (Bug #70429, Bug #17512527)
If the general query log or slow query log file was set to a FIFO or socket file, and the file reader went away, the server stopped executing statements. Now the server detects such files, logs an error message, and continues with the appropriate log disabled. (Bug #67088, Bug #14757009)
LIKE matches failed for code points
of HALF WIDTH KATAKANA in the
cp932 character sets.
(Bug #47641, Bug #11755818)