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MySQL : MySQL 5.6.5 リリース
投稿者: webmaster 投稿日時: 2012-4-10 8:00:00 (13792 ヒット)

MySQL 5.6.5-m8 がリリースされました。
このバージョンは、MySQL 5.6 シリーズの最新バージョンです。



D.1.2. Changes in MySQL 5.6.5 (2012-April-10, Milestone 8)

Platform Notes

* Beginning with MySQL 5.6.5 Oracle will no longer provide binaries
for Mac OS X 10.5. This aligns with Apple no longer providing
updates or support for this platform.

Data Type Notes

* Previously, at most one TIMESTAMP column per table could be
automatically initialized or updated to the current date and
time. This restriction has been lifted. Any TIMESTAMP column
definition can have any combination of DEFAULT
addition, these clauses now can be used with DATETIME column
definitions. For more information, see Section 11.3.4,
"Automatic Initialization and Updating for TIMESTAMP and

Replication with GTIDs

* Important Change: Replication: This release introduces global
transaction identifiers (GTIDs) for MySQL Replication. A GTID
is a unique identifier that is assigned to each transaction as
it is committed; this identifier is unique on the MySQL Server
where the transaction originated, as well as across all MySQL
Servers in a given replication setup. Because GTID-based
replication depends on tracking transactions, it cannot be
employed with tables that employ a nontransactional storage
engine such as MyISAM; thus, it is currently supported only
with InnoDB tables.
Because each transaction is uniquely identified, it is not
necessary when using GTIDs to specify positions in the
master's binary log when starting a new slave or failing over
to a new master. This is reflected in the addition of a new
which takes the place of the MASTER_LOG_FILE and
MASTER_LOG_POS options when when executing this statement to
prepare a MySQL Server to act as a replication slave.
To enable GTIDs on a MySQL Server, the server must be started
with the options
--gtid-mode=ON --disable-gtid-unsafe-statements --log-bin
These options are needed whether the server acts as a replication
master or as a replication slave; the --gtid-mode and
--disable-gtid-unsafe-statements options are new in this release.
Once the master and slave have each been started with these options,
it is necessary only to issue a CHANGE MASTER TO ...
MASTER_AUTO_POSITION=1 followed by START SLAVE on the slave to start
A number of new server system variables have also been added
for monitoring GTID usage. For more information about these
options and variables, see Section, "Global
Transaction ID Options and Variables."
As part of these changes, three new mysqlbinlog options
--include-gtids, --exclude-gtids, and --skip-gtids
have been added for reading binary logs produced when the server
participates in replication with GTIDs.

Due to an issue discovered just prior to release, you cannot
import a dump made using mysqldump from a MySQL 5.5 server to
a MySQL 5.6.5 server and then use mysqlupgrade on the MySQL
5.6.5 server while GTIDs are enabled; doing so makes it
impossible to connect to the server normally following the
upgrade. Instead, you should import the dump and run
mysqlupgrade while the MySQL 5.6.5 server is running with
--gtid-mode=OFF, then restart it with --gtid-mode=ON. (Bug
For additional information about GTIDs and setting up
GTID-based replication, see Section 16.1.3, "Replication with
Global Transaction Identifiers."

Host Cache Notes

* MySQL now provides more information about the causes of errors
that occur when clients connect to the server, as well as
improved access to the host cache, which contains client IP
address and host name information and is used to avoid DNS
lookups. These changes have been implemented:

+ New Connection_errors_xxx status variables provide
information about connection errors that do not apply to
specific client IP addresses.

+ Counters have been added to the host cache to track
errors that do apply to specific IP addresses.

+ A new host_cache Performance Schema table exposes the
contents of the host cache so that it can be examined
using SELECT statements. Access to host cache contents
makes it possible to answer questions such as how many
hosts are cached, what kinds of connection errors are
occurring for which hosts, or how close host error counts
are to reaching the max_connect_errors system variable
limit. The Performance Schema must be enabled or this
table is empty.
If you upgrade to this release of MySQL from an earlier
version, you must run mysql_upgrade (and restart the
server) to incorporate this change into the
performance_schema database.

+ The host cache size now is configurable using the
host_cache_size system variable. Setting the size to 0
disables the host cache.This is similar to starting the
server with --skip-host-cache, but host_cache_size is
more flexible because it can also be used to resize,
enable, or disable the host cache at runtime, not just at
server startup. If you start the server with
--skip-host-cache, the host cache cannot be re-enabled at

For more information, see Section, "DNS Lookup
Optimization and the Host Cache," and Section, "The
host_cache Table." (Bug #22821, Bug #24906, Bug #45817, Bug
#59404, Bug #11746048, Bug #11746269, Bug #11754244, Bug

Optimizer Features

* These query optimizer improvements were implemented:

+ The EXPLAIN statement now can produce output in JSON
format. To select this, use EXPLAIN FORMAT = JSON
explainable_stmt syntax. With FORMAT = JSON, the output
includes regular EXPLAIN information, as well as extended
and partition information.
Traditional EXPLAIN output has also changed so that empty
columns contain NULL rather the empty string. In
addition, UNION RESULT rows have Using filesort in the
Extra column because a temporary table is used to buffer
UNION results.
To work for both Optimizer Trace and JSON-format EXPLAIN
output, the end_marker parameter for the optimizer_trace
system variable has been moved to a separate
end_markers_in_json system variable. This is an
incompatible change to the optimizer_trace variable. For
more information, see MySQL Internals: Optimizer tracing

+ The optimizer tries to find the best query execution plan
by beginning with the most promising table and
recursively adding to the plan the most promising of the
remaining tables. Partial execution plans with a higher
cost than an already found plan are pruned. The optimizer
now attempts to improve the order in which it adds tables
to the plan, resulting in a reduction of the number of
partial plans considered.
Queries that are likely to have improved performance are
joins of many tables, where most tables use eq_ref or ref
join types (as indicated by EXPLAIN output).
A new status variable, Last_query_partial_plans, counts
the number of iterations the optimizer makes in execution
plan construction for the previous query.

+ The optimizer uses semi-join and materialization
strategies to optimize subquery execution. See Section, "Optimizing Subqueries with Semi-Join
Transformations," and Section, "Optimizing
Subqueries with Subquery Materialization." In addition,
the Batched Key Access (BKA) Join and Block Nested-Loop
(BNL) Join algorithms used for inner join and outer join
operations have been extended to support semi-join
operations. For more information, see Section 8.13.11,
"Block Nested-Loop and Batched Key Access Joins."
Several flags have been added to the optimizer_switch
system variable to enable control over semi-join and
subquery materialization strategies. See Section,
"Controlling Switchable Optimizations."

+ For expressions such as col_name IN(values) that compare
a column to a list of values, the optimizer previously
made row estimates using index dives for each value in
the list. This becomes inefficient as the number of
values becomes large. The optimizer now can make row
estimates for such expressions using index statistics
instead, which is less accurate but quicker for a large
number of values. The point at which the optimizer
switches from index dives to index statistics is
configurable using the new eq_range_index_dive_limit
system variable. For more information, see Section, "Equality Range Optimization of Many-Valued

Performance Schema Notes

* The Performance Schema has these additions:

+ The Performance Schema now has a host_cache table that
exposes the contents of the host cache so that it can be
examined using SELECT statements. See Host Cache Notes

+ The Performance Schema now maintains statement digest
information. This normalizes and groups statements with
the same "signature" and permits questions to be answered
about the types of statements the server is executing and
how often they occur.
o A statement_digest consumer in the setup_consumers
table controls whether the Performance Schema
maintains digest information.
o The statement event tables
events_statements_history, and
events_statements_history_long) have DIGEST and
DIGEST_TEXT columns that contain digest MD5 values
and the corresponding normalized statement text
o A events_statements_summary_by_digest table provides
aggregated statement digest information.

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
For more information, see Chapter 20, "MySQL Performance

Functionality Added or Changed

* Security Fix: Passwords stored in the older format used before
MySQL 4.1 are now deprecated, and the secure_auth system
variable is enabled by default to prevent connections using
accounts that have passwords stored in the old format. To
permit such connections, start the server with
--skip-secure-auth. (Bug #13586336)

* Security Fix: MySQL client programs now issue a warning if a
password is given on the command line that this can be

* Incompatible Change: The obsolete OPTION modifier for the SET
statement has been removed.

* InnoDB Storage Engine: --ignore-builtin-innodb is now ignored
if used. (Bug #13586262)

* The MySQL-shared-compat RPM package enables users of Red
Hat-provided mysql-*-5.1 RPM packages to migrate to
Oracle-provided MySQL-*-5.5 packages. MySQL-shared-compat now
replaces the Red Hat mysql-libs package by replacing
libmysqlclient.so files of the latter package, thus satisfying
dependencies of other packages on mysql-libs. This change
affects only users of Red Hat (or Red Hat-compatible) RPM
packages. Nothing is different for users of Oracle RPM
packages. (Bug #13867506)

* Temporary tables for INFORMATION_SCHEMA queries now use packed
MyISAM format if they contain sufficiently large VARCHAR
columns, resulting in space savings. (Bug #13627632)

* As of MySQL 5.5.3, the LOW_PRIORITY modifier for LOCK TABLES
... LOW_PRIORITY WRITE has no effect. This modifier is now
deprecated. Its use should be avoided and now produces a
warning. Use LOCK TABLES ... WRITE instead. (Bug #13586314)

* A new CMake option, MYSQL_PROJECT_NAME, can be set on Windows
or Mac OS X to be used in the project name. (Bug #13551687)

* If the log_queries_not_using_indexes system variable is
enabled, slow queries that do not use indexes are written to
the slow query log. In this case, it is now possible to put a
logging rate limit on these queries by setting the new
log_throttle_queries_not_using_indexes system variable, so
that the slow query log does not grow too quickly. By default,
this variable is 0, which means there is no limit. Positive
values impose a per-minute limit on logging of queries that do
not use indexes. (Bug #55323, Bug #11762697)

* A new server option, --slow-start-timeout, controls the
Windows service control manager's service start timeout. The
value is the maximum number of milliseconds that the service
control manager waits before trying to kill the MySQL service
during startup. The default value is 15000 (15 seconds). If
the MySQL service takes too long to start, you may need to
increase this value. A value of 0 means there is no timeout.
(Bug #45546, Bug #11754011)

* The mysql client now supports an --init-command=str option.
The option value is an SQL statement to execute after
connecting to the server. If auto-reconnect is enabled, the
statement is executed again after reconnection occurs. (Bug
#45634, Bug #11754087)

* Several subquery performance issues were resolved through the
implementation of semi-join subquery optimization strategies.
See Section, "Optimizing Subqueries with Semi-Join
Transformations." (Bug #47914, Bug #11756048, Bug #58660, Bug
#11765671, Bug #10815, Bug #11745162, Bug #9021, Bug
#13519134, Bug #48763, Bug #11756798, Bug #25130, Bug

* New utf8_general_mysql500_ci and ucs2_general_mysql500_ci
collations have been added that preserve the behavior of
utf8_general_ci and ucs2_general_ci from versions of MySQL
previous to 5.1.24. Bug #27877 corrected an error in the
original collations but introduced an incompatibility for
columns that contain German 'ß' LATIN SMALL LETTER SHARP S.
(As a result of the fix, that character compares equal to
characters with which it previously compared different.) A
symptom of the problem after upgrading to MySQL 5.1.24 or
newer from a version older than 5.1.24 is that CHECK TABLE
produces this error:
Table upgrade required.
Please do "REPAIR TABLE `t`" or dump/reload to fix it!
Unfortunately, REPAIR TABLE could not fix the problem. The new
collations permit older tables created before MySQL 5.1.24 to
be upgraded to current versions of MySQL.
To convert an affected table after a binary upgrade that
leaves the table files in place, alter the table to use the
new collation. Suppose that the table t1 contains one or more
problematic utf8 columns. To convert the table at the table
level, use a statement like this:
CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci;
To apply the change on a column-specific basis, use a
statement like this (be sure to repeat the column definition
as originally specified except for the COLLATE clause):
MODIFY c1 CHAR(N) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci;
To upgrade the table using a dump and reload procedure, dump
the table using mysqldump, modify the CREATE TABLE statement
in the dump file to use the new collation, and reload the
After making the appropriate changes, CHECK TABLE should
report no error.
For more information, see Section 2.11.3, "Checking Whether
Tables or Indexes Must Be Rebuilt," and Section 2.11.4,
"Rebuilding or Repairing Tables or Indexes." (Bug #43593, Bug

* MySQL distributions no longer include the GPL readline
input-editing library. This results in simpler maintenance and
support, and simplifies licensing considerations.

support READ WRITE and READ ONLY modifiers to set the
transaction access mode for tables used in transactions. The
default mode is read/write, which is the same mode as
previously. Read/write mode now may be specified explicitly
with the READ WRITE modifier. Using READ ONLY prohibits table
changes and may enable storage engines to make performance
improvements that are possible when changes are not permitted.
In addition, the new --transaction-read-only option and
tx_read_only system variable permit the default transaction
access mode to be set at server startup and runtime.
For more information, see Section 13.3.6, "SET TRANSACTION
Syntax," and Section 13.3.1, "START TRANSACTION, COMMIT, and

Bugs Fixed

* Performance: InnoDB Storage Engine: The optimizer now takes
into account InnoDB page sizes other than 16KB, which can be
configured with the innodb_page_size option when creating a
MySQL instance. This change improves the estimates of I/O
costs for queries on systems with non-default InnoDB page
sizes. (Bug #13623078)

* Performance: InnoDB Storage Engine: Memory allocation for
InnoDB tables was reorganized to reduce the memory overhead
for large numbers of tables or partitions, avoiding situations
where the "resident set size" could grow regardless of FLUSH
TABLES statements. (Bug #11764622, Bug #57480)

* Incompatible Change: Replication: CHANGE MASTER TO statements
were written into the error log using quoted numeric values,
although the syntax for this statement does not allow such
option values to be quoted. This meant that such statements
could not be copied from the error log and re-run verbatim.
Now CHANGE MASTER TO statements are written to the error log
without the extraneous quotation marks, and so are
syntactically correct as logged.

* Incompatible Change: A change in MySQL 5.6.3 caused LAST_DAY()
to be more strict and reject incomplete dates with a day part
of zero. For this function, a nonzero day part is not
necessary, so the change has been reverted. (Bug #13458237)

* Important Change: InnoDB Storage Engine: When a row grew in
size due to an UPDATE operation, other (non-updated) columns
could be moved to off-page storage so that information about
the row still fit within the constraints of the InnoDB page
size. The pointer to the new allocated off-page data was not
set up until the pages were allocated and written, potentially
leading to lost data if the system crashed while the column
was being moved out of the page.
A related issue was that during such an UPDATE operation, or
an INSERT operation that reused a delete-marked record, other
transactions could see invalid data for the affected column,
regardless of isolation level.
The fix corrects the order of operations for moving the column
data off the original page and replacing it with a pointer.
(Bug #13721257, Bug #12612184, Bug #12704861)

* Important Change: Replication: The CHANGE MASTER TO statement
was not checked for invalid characters in values for options
such as MASTER_HOST and MASTER_USER. In addition, when the
server was restarted, a value containing certain characters
was trimmed, causing the loss of its original value. Now such
values are validated, and in cases where the value contains
invalid characters, including linefeed (\n or 0x0A)
characters, the statement fails with an error
(ER_MASTER_INFO). (Bug #11758581, Bug #50801)

* Important Change: Replication: Moving the binary log file,
relay log file, or both files to a new location, then
restarting the server with a new value for --log-bin,
--relay-log, or both, caused the server to abort on start.
This was because the entries in the index file overrode the
new location. In addition, paths were calculated relative to
datadir (rather than to the --log-bin or --relay-log values).
The fix for this problem means that, when the server reads an
entry from the index file, it now checks whether the entry
contains a relative path. If it does, the relative part of the
path is replaced with the absolute path set using the
--log-bin or --relay-log option. An absolute path remains
unchanged; in such a case, the index must be edited manually
to enable the new path or paths to be used. (Bug #11745230,
Bug #12133)

* InnoDB Storage Engine: A DDL operation such as ALTER TABLE ...
ADD COLUMN could stall, eventually timing out with an Error
1005: Can't create table message referring to
fil_rename_tablespace. (Bug #13636122, Bug #62100, Bug #63553)

* InnoDB Storage Engine: If InnoDB was started with
innodb_force_recovery set to a value of 3 or 4, and there are
transactions to roll back, normal shutdown would hang waiting
for those transactions to complete. Now the shutdown happens
immediately, without rolling back any transactions, because
non-zero values for innodb_force_recovery are only appropriate
for troubleshooting and diagnostic purposes. (Bug #13628420)

* InnoDB Storage Engine: The MySQL server could hang in some
cases if the configuration option innodb_use_native_aio was
turned off. (Bug #13619598)

* InnoDB Storage Engine: The configuration option
innodb_sort_buf_size was renamed to innodb_sort_buffer_size
for consistency. This work area is used while creating an
InnoDB index. (Bug #13610358)

* InnoDB Storage Engine: The server could crash when creating an
InnoDB temporary table under Linux, if the $TMPDIR setting
points to a tmpfs filesystem and innodb_use_native_aio is
enabled, as it is by default in MySQL 5.5.4 and higher. The
entry in the error log looked like:
101123 2:10:59 InnoDB: Operating system error number 22 in a file
InnoDB: Error number 22 means 'Invalid argument'.
The crash occurred because asynchronous I/O is not supported
on tmpfs in some Linux kernel versions. The workaround was to
turn off the innodb_use_native_aio setting or use a different
temporary directory. The fix causes InnoDB to turn off the
innodb_use_native_aio setting automatically if it detects that
the temporary file directory does not support asynchronous
I/O. (Bug #13593888, Bug #11765450, Bug #58421)

* InnoDB Storage Engine: During startup, the status variable
Innodb_buffer_pool_dump_status could be empty for a brief time
before being initialized to the correct value not started.
(Bug #13513676)

* InnoDB Storage Engine: The MySQL error log could contain
messages like:
InnoDB: Ignoring strange row from mysql.innodb_index_stats WHERE ...
The fix makes the contents of the innodb_index_stats and
innodb_table_stats tables case-sensitive, to properly
distinguish the statistics for tables whose names differ only
in letter case. Other cases were fixed where the wrong name
could be selected for an index while retrieving persistent
statistics. (Bug #13432465)

* InnoDB Storage Engine: The MySQL server could halt with an
assertion error:
InnoDB: Failing assertion: page_get_n_recs(page) > 1
Subsequent restarts could fail with the same error. The error
occurred during a purge operation involving the InnoDB change
buffer. The workaround was to set the configuration option
innodb_change_buffering=inserts. (Bug #13413535, Bug #61104)

* InnoDB Storage Engine: When doing a live downgrade from MySQL
5.6.4 or later, with innodb_page_size set to a value other
than 16384, now the earlier MySQL version reports that the
page size is incompatible with the older version, rather than
crashing or displaying a "corruption" error. (Bug #13116225)

* InnoDB Storage Engine: Certain CREATE TABLE statements could
fail for InnoDB child tables containing foreign key
definitions. This problem affected Windows systems only, with
the setting lower_case_table_names=0. It was a regression from
MySQL bug #55222. (Bug #13083023, Bug #60229)

* InnoDB Storage Engine: If the server crashed during a TRUNCATE
TABLE or CREATE INDEX statement for an InnoDB table, or a DROP
DATABASE statement for a database containing InnoDB tables, an
index could be corrupted, causing an error message when
accessing the table after restart:
InnoDB: Error: trying to load index index_name for table table_name
InnoDB: but the index tree has been freed!
(Bug #12861864, Bug5.1 #11766019)

* InnoDB Storage Engine: InnoDB persistent statistics gave less
accurate estimates for date columns than for columns of other
data types. The fix changes the way cardinality is estimated
for non-unique keys, and avoids situations where identical
values could be counted twice if they occurred on different
index pages. (Bug #12429443)

* InnoDB Storage Engine: Improved the accuracy of persistent
InnoDB statistics for large tables. The estimate of distinct
records could be inaccurate if the index tree was more than 3
levels deep. (Bug #12316365)

* InnoDB Storage Engine: Shutdown could hang with messages like
this in the log:
Waiting for purge thread to be suspended
After 1 hour, the shutdown times out and mysqld quits. This
problem is most likely to occur with a high value for
innodb_purge_threads. (Bug #11765863, Bug #58868, Bug #60939)

* InnoDB Storage Engine: When DROP TABLE failed due to all undo
slots being in use, the error returned was Unknown table '...'
rather than the expected Too many active concurrent
transactions. (Bug #11764724, Bug #57586)
References: See also Bug #11764668, Bug #57529.

* InnoDB Storage Engine: Server startup could produce an error
for temporary tables using the InnoDB storage engine, if the
path in the $TMPDIR variable ended with a / character. The
error log would look like:
120202 19:21:26 InnoDB: Error: trying to open a table, but could not
InnoDB: open the tablespace file './t/#sql7750_1_0.ibd'!
(Bug #11754376, Bug #45976)

* Partitioning: When creating a view from a SELECT statement
that used explicit partition selection, the partition
selection portion of the query was ignored. (Bug #13559657)

* Partitioning: Adding a partition to an already existing
LIST-partitioned table did not work correctly if the number of
items in the new partition was greater than 16. This could
happen when trying to add a partition using an ALTER TABLE ...
PARTITION statement. (Bug #13029508, Bug #62505)

* Partitioning: A function internal to the code for finding
matching subpartitions represented an unsigned number as
signed, with the result that matching subpartitions were
sometimes missed in results of queries. (Bug #12725206, Bug
References: See also Bug #20257.

* Partitioning: After updating a row of a partitioned table and
selecting that row within the same transaction with the query
cache enabled, then performing a ROLLBACK, the same result was
returned by an identical SELECT issued in a new transaction.
(Bug #11761296, Bug #53775)

* Partitioning: An ALTER TABLE ... ADD PARTITION statement
subsequent to ALTER TABLE ... REORGANIZE PARTITION failed on a
table partitioned by HASH or KEY. (Bug #11764110, Bug #56909)

* Replication: Executing mysqlbinlog with the --start-position=N
option, where N was equal either to 0 or to a value greater
than the length of the dump file, caused it to crash.
This issue was introduced in MySQL 5.5.18 by the fix for Bug
#32228 and Bug #11747416. (Bug #13593869, Bug #64035)

* Replication: When starting the server, replication
repositories were checked even when the --server-id was equal
to 0 (the default), in spite of the fact that a valid nonzero
value for --server-id must be supplied for a server that acts
as either a master or a slave in MySQL replication.
This could cause problems when trying to perform a live
upgrade from MySQL 5.5, although it was possible to work
around the issue by starting the server with
--skip-slave-start (in addition to any other required
To avoid this problem, replication repositories are now
checked only when the server is started with --server-id using
a nonzero value. (Bug #13427444, Bug #13504821)

* Replication: Formerly, the default value shown for the Port
column in the output of SHOW SLAVE HOSTS was 3306 whether the
port had been set incorrectly or not set at all. Now, when the
slave port is not set, 0 is used as the default. This change
also affects the default used for the --report-port server
option. (Bug #13333431)

* Replication: A race condition could occur when running
multiple instances of mysqld on a single machine, when more
than slave thread was started at the same time, and each such
thread tried to use the same temporary file concurrently. (Bug
#12844302, Bug #62055)

* Replication: Statements that wrote to tables with
AUTO_INCREMENT columns based on an unordered SELECT from
another table could lead to the master and the slave going out
of sync, as the order in which the rows are retrieved from the
table may differ between them. Such statements include any
SELECT statement. Such statements are now marked as unsafe for
statement-based replication, which causes the execution of one
to throw a warning, and forces the statement to be logged
using the row-based format if the logging format is MIXED.
(Bug #11758263, Bug #50440)

* Replication: On Windows replication slave hosts, STOP SLAVE
took an excessive length of time to complete when the master
was down. (Bug #11752315, Bug #43460)

* The optimizer did not perform constant propagation for views,
so a query containing views resulted in a less efficient
execution plan than the corresponding query using only base
tables. (Bug #13783777)

* A memory leak could occur for queries containing a subquery
that used GROUP BY on an outer column. (Bug #13724099)

* After using an ALTER TABLE statement to change the
KEY_BLOCK_SIZE property for an InnoDB table, for example when
switching from an uncompressed to a compressed table,
subsequent server restarts could fail with a message like:
InnoDB: Error: data file path/ibdata2 uses page size 1024,
InnoDB: but the only supported page size in this release is=16384
This issue is a regression introduced in MySQL 5.5.20. (Bug
#13698765, Bug #64160)

* _mi_print_key() iterated one time too many when there was a
NULL bit, resulting in Valgrind warnings. (Bug #13686970)

* Pushing down to InnoDB an index condition that called a stored
function resulted in a server crash. This kind of condition is
no longer pushed down. (Bug #13655397)

* A SELECT from a subquery that returned an empty result could
itself fail to return an empty result as expected. (Bug
#13651009, Bug #13650418)

* If during server startup a signal such as SIGHUP was caught
prior to full server initialization, the server could crash.
This was due to a race condition between the signal handler
thread and the main thread performing server initialization.
To prevent this from happening, signal processing is now
suspended until full initialization of all server components
has been completed successfully. (Bug #13608371, Bug #62311)

* The shared version of libmysqlclient did not export these
functions for linking by client programs: get_tty_password(),
handle_options(), my_print_help(). (Bug #13604121)

* An aggregated expression of type MIN() or MAX() should return
NULL but could instead return the empty set if the query was
implicitly grouped and there was no HAVING clause that
evaluates to FALSE. (Bug #13599013)

* Left join queries could be incorrectly converted to inner
joins and return erroneous result sets. (Bug #13595212)

* Date-handling code could raise an assertion attempting to
calculate the number of seconds since the epoch. (Bug

* For queries that used a join type of ref_or_null, the
optimizer could skip the filesort operation and sort the
results incorrectly. (Bug #13531865)

* For some queries, a filesort operation was done even when the
result contained only a single row and needed no sorting. (Bug

* The optimizer could return an incorrect select limit in some
cases when a query included no explicit LIMIT clause. (Bug

* In some cases, the optimizer failed to use a covering index
when that was possible and read data rows instead. (Bug

* The Performance Schema instrumentation for stages did not
fully honor the ENABLED column in the schema.setup_instruments
table. (Bug #13509513)

* SELECT statements failed for the EXAMPLE storage engine. (Bug
References: This bug was introduced by Bug #11746275.

* Converting a string ending with a decimal point (such as '1.')
to a floating-point number raised a data truncation warning.
(Bug #13500371)

* Use of an uninitialized TABLE_SHARE member could cause a
server crash. (Bug #13489996)

* Some outer joins that used views as inner tables did not
evaluate conditions correctly. (Bug #13464334)

* A query that used an index on a CHAR column referenced in a
BETWEEN clause could return invalid results. (Bug #13463488,
Bug #63437)

* Expressions that compared a BIGINT column with any non-integer
constant were performed using integers rather than decimal or
float values, with the result that the constant could be
truncated. This could lead to any such comparison that used <,
>, <=, >=, =, !=/<>, IN, or BETWEEN yielding false positive or
negative results. (Bug #13463415, Bug #11758543, Bug #63502,
Bug #50756)

* Instantiating a derived table for a query with an empty result
caused a server crash. (Bug #13457552)

* When the optimizer performed conversion of DECIMAL values
while evaluating range conditions, it could produce incorrect
results. (Bug #13453382)

* On Windows, rebuilds in a source distribution failed to create
the initial database due to insufficient cleanup from the
previous run or failure to find the proper server executable.
(Bug #13431251)

* Enabling index condition pushdown could cause performance
degradation. (Bug #13430436)

* Implicitly grouped queries with a const table and no matching
rows could return incorrect results. (Bug #13430588)

* When a fixed-width row was inserted into a MyISAM temporary
table, the entire content of the record buffer was written to
the table, including any trailing space contained in VARCHAR
columns, the issue being that this trailing space could be
uninitialized. This problem has been resolved by insuring that
only the bytes actually used to store the VARCHAR (and none
extra) are copied and inserted in such cases. (Bug #13389854)

* Fractional seconds parts were lost for certain UNION ALL
queries. (Bug #13375823)

* Temporary MyISAM tables (unlike normal MyISAM tables) did not
use the packed record format when they contained VARCHAR
columns, resulting in larger temporary files (and more file
I/O) than necessary. (Bug #13350136)

* When merging ranges that effectively resulted in a full index
scan, the optimizer did not discard the range predicate as
unneeded. (Bug #13354910)

* When executing EXPLAIN, it was assumed that only the default
multi-range read implementation could produce an ordered
result; this meant that when a query on a table that used a
storage engine providing its own sorted MRR, it was ignored,
so that EXPLAIN failed to report Using MRR even when a
multi-range read was used. (Bug #13330645)

* Performance Schema idle event timings were not normalized to
the same units as wait timings. (Bug #13018537)

* In MySQL 5.6.3, a number of status variables were changed to
longlong types so that they would roll over much later.
However, the format string used by mysqladmin status to print
Queries per second values did not reflect this, causing such
values to be misreported. (Bug #12990746)
References: See also Bug #42698. This bug was introduced by
Bug #11751727.

* When the result of a stored function returning a non-integer
type was evaluated for NULL, an incorrect type warning
(Warning 1292 Truncated incorrect INTEGER value) is generated,
although such a test for NULL should work with any type. This
could cause stored routines not handling the warning correctly
to fail.
The issue could be worked around by wrapping the result in an
expression, using a function such as CONCAT(). (Bug #12872824,
Bug #62125)

* When running mysqldump with both the --single-transaction and
--flush-logs options, the flushing of the log performed an
implicit COMMIT (see Section 13.3.3, "Statements That Cause an
Implicit Commit"), causing more than one transaction to be
used and thus breaking consistency. (Bug #12809202, Bug

* A query that used an aggregate function such as MAX() or MIN()
of an index with NOT BETWEEN in the WHERE clause could fail to
match rows, thus returning an invalid result. (Bug #12773464,
Bug #61925)

* With ONLY_FULL_GROUP_BY SQL mode enabled, columns that were
not aggregated in the the select list or named in a GROUP BY
were incorrectly permitted in ORDER BY. (Bug #12626418)

* Mishandling of NO_BACKSLASH_ESCAPES SQL mode within stored
procedures on slave servers could cause replication failures.
(Bug #12601974)

* With ONLY_FULL_GROUP_BY SQL mode enabled, a query that uses
GROUP BY on a column derived from a subquery in the FROM
clause failed with a column isn't in GROUP BY error, if the
query was in a view. (Bug #11923239)

* Attempting to execute ALTER TABLE on a temporary MERGE table
having an underlying temporary table rendered the MERGE table
unusable, unless the ALTER TABLE specified a new list of
underlying tables. (Bug #11764786, Bug #57657)

* When used with the --xml option, mysqldump --routines failed
to dump any stored routines, triggers, or events. (Bug
#11760384, Bug #52792)

* A HAVING clause in a query using MIN() or MAX() was sometimes
ignored. (Bug #11760517, Bug #52935)
References: See also Bug #11758970, Bug #51242, Bug #11759718,
Bug #52051.

* It was possible in the event of successive failures for
mysqld_safe to restart quickly enough to consume excessive
amounts of CPU. Now, on systems that support the sleep and
date system utilities, mysqld_safe checks to see whether it
has restarted more than 5 times in the current second, and if
so, waits 1 second before attempting another restart. (Bug
#11761530, Bug #54035)

* It was possible on replication slaves where FEDERATED tables
were in use to get timeouts on long-running operations, such
as Error 1160 Got an error writing communication packets. The
FEDERATED tables did not need to be replicated for the issue
to occur. (Bug #11758931, Bug #51196)
References: See also Bug #12896628, Bug #61790.

* Previously, .OLD files were not included among the files
deleted by DROP DATABASE. Files with this extension are now
also deleted by the statement. (Bug #11751736, Bug #42708)

* If an attempt to initiate a statement failed, the issue could
not be reported to the client because it was not prepared to
receive any error messages prior to the execution of any
statement. Since the user could not execute any queries, they
were simply disconnected without providing a clear error.
After the fix for this issue, the client is prepared for an
error as soon as it attempts to initiate a statement, so that
the error can be reported prior to disconnecting the user.
(Bug #11755281, Bug #47032)

* A prepared statement using a view whose definition changed
between preparation and execution continued to use the old
definition, which could cause the prepared statement to return
incorrect results. (Bug #11748352, Bug #36002)

* Locale information for FORMAT() function instances was lost in
view definitions. (Bug #63020, Bug #13344643)

* mysqlhotcopy failed for databases containing views. (Bug
#62472, Bug #13006947)

* The VIO description string was initialized even for
connections where it was unneeded. (Bug #62285, Bug #12951586)

* The embedded server crashed when argc = 0. (Bug #57931, Bug

* The handle_segfault() signal-handler code in mysqld could
itself crash due to calling unsafe functions. (Bug #54082, Bug

* UPDATE IGNORE returned an incorrect count for number of rows
updated when there were duplicate-key conflicts in a
multiple-table update. (Bug #59715, Bug #11766576)

* The optimizer mishandled STRAIGHT_JOIN used with nested joins;
for example, by not evaluating tables in the specified order.
(Bug #59487, Bug #11766384, Bug #43368, Bug #11752239, Bug
#60080, Bug #11766858)

* A subquery involved in a comparison requiring a character set
conversion caused an error that resulted in a server crash.
(Bug #59185, Bug #11766143)

* Assigning the result of a subquery to a user variable raised
an assertion when the outer query included DISTINCT and GROUP
BY. (Bug #57196, Bug #11764371)

* On Windows, pasting multiple-line input including a CRLF
terminator on the last line into the mysql client resulted in
the first character of the last line being changed, resulting
in erroneous statements. (Bug #60901, Bug #12589167)

* If tables were locked by LOCK TABLES ... READ in another
session, SET GLOBAL read_only = 1 failed to complete. (Bug
#57612, Bug #11764747)

* The contents of the shared and shared-compat RPM packages had
been changed in versions 5.5.6 and 5.6.1 to avoid the overlap
which they traditionally had (and still have in MySQL 5.0 and
5.1). However, the RPM meta information had not been changed
in accordance, and so RPM still assumed a conflict between
shared and shared-compat RPM packages. This has been fixed.
(Bug #60855, Bug #12368215)
References: See also Bug #56150.

* The result of SUBSTRING_INDEX() could be missing characters
when used as an argument to conversion functions such as
LOWER(). (Bug #60166, Bug #11829861)

* A confusing CREATE TABLE error message was improved. (Bug
#54963, Bug #11762377)

* For comparisons containing out-of-range constants, the
optimizer permitted warnings to leak through to the client,
even though it accounted for the range issue internally. (Bug
#56962, Bug #11764155)

* Enabling myisam_use_mmap could cause the server to crash. (Bug
#48726, Bug #11756764)

* On Windows, the server incorrectly constructed the full path
name of the plugin binary for INSTALL PLUGIN and CREATE
FUNCTION ... SONAME. (Bug #45549, Bug #11754014)

* Using myisamchk with the sort recover method to repair a table
having fixed-width row format could cause the row pointer size
to be reduced, effectively resulting in a smaller maximum data
file size. (Bug #48848, Bug #11756869)

* myisam_sort_buffer_size could not be set larger than 4GB on
64-bit systems. (Bug #45702, Bug #11754145)

* For MEMORY tables, a scan of a HASH index on a VARCHAR column
could fail to find some rows if the index was on a prefix of
the column. (Bug #47704, Bug #11755870)

* The stored routine cache was subject to a small memory leak
that over time or with many routines being used could result
in out-of-memory errors. (Bug #44585, Bug #11753187)

* Due to improper locking, concurrent inserts into an ARCHIVE
table at the same time as repair and check operations on the
table resulted in table corruption. (Bug #37280, Bug

* Under some circumstances, the result of SUBSTRING_INDEX()
incorrectly depended on the contents of the previous row. (Bug
#42404, Bug #11751514)

* Setting an event to DISABLED status and with the ON COMPLETION
NOT PRESERVE attribute caused it to be dropped at the next
server restart. (Bug #37666, Bug #11748899)

* Stored functions could produce an error message that referred
to ORDER BY even though the offending statement within the
function had no such clause. (Bug #35410, Bug #11748187)

* The decision about how to sort a result set could be reported
incorrectly by EXPLAIN for some statements, causing Using
filesort or Using temporary to be reported when they should
not have been or vice versa. This could occur for statements
that included index hints, that had the form SELECT
with LIMIT, or that used GROUP BY, ORDER BY, and LIMIT.

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