This release contains 21 bug fixes, including a fix for a slowdown on loading of schema objects in the SQL Editor.

MySQL Workbench 5.2 GA

• Data Modeling

• Query (replaces the old MySQL Query Browser)

• Administration (replaces the old MySQL Administrator)

Sources and binary packages are available for several platforms, including Windows, Mac OS X and Linux.

In addition to the new Query/SQL Development and Administration modules, version 5.2 features improved stability and performance – especially in Windows, where OpenGL support has been enhanced and the UI was optimized to offer better responsiveness. This release also includes improvements to the scripting capabilities of the SQL Editor.

This new versions brings new features such as

* Exception and command injector support
* Millseconds support
* Better partial-trust support
* Better intellisense including auto-completion when editing stored procedures or .mysql files

for MySQL has been released.  This is a maintenance release to the 6.3

release chain and includes 40 changes and fixes.

Version 6.3.8 is appropriate for use with versions of MySQL 5.0-5.5.

The new features in these releases are of beta quality. As with any
other pre-production release, caution should be taken when installing on
production level systems or systems with critical data.

Note that 5.6.4 includes all features in MySQL 5.5.

D.1.2. Changes in MySQL 5.6.4 (20 December 2011 Milestone 7)

Condition Handler Changes

* Incompatible Change: MySQL now supports the GET DIAGNOSTICS
statement. GET DIAGNOSTICS provides applications a
standardized way to obtain information from the diagnostics
area, such as whether the previous SQL statement produced an
exception and what it was. For more information, see Section
12.6.7.3, “GET DIAGNOSTICS Syntax.”

In addition several deficiencies in condition handler
processing rules were corrected so that MySQL behavior is more
like standard SQL:

+ Block scope is used in determining which handler to
select. Previously, a stored program was treated as
having a single scope for handler selection.

+ Condition precedence is more accurately resolved.

+ Diagnostics area clearing has changed. Bug #55843 caused
handled conditions to be cleared from the diagnostics
area before activating the handler. This made condition
information unavailable within the handler. Now condition
information is available to the handler, which can
inspect it with the GET DIAGNOSTICS statement. The
condition information is cleared when the handler exits,
if it has not already been cleared during handler
execution.

+ Previously, handlers were activated as soon as a
condition occurred. Now they are not activated until the
statement in which the condition occurred finishes
execution, at which point the most appropriate handler is
chosen. This can make a difference for statements that
raise multiple conditions, if a condition raised later
during statement execution has higher precedence than an
earlier condition and there are handlers in the same
scope for both conditions. Previously, the handler for
the first condition raised would be chosen, even if it
had a lower precedence than other handlers. Now the
handler for the condition with highest precedence is
chosen, even if it is not the first condition raised by
the statement.

+ Issues that caused server crashes resulting from
incorrect handler call stack processing were fixed.

The work just described involved several condition-handler bug
fixes:

+ The RETURN statement did not clear the diagnostics area
as it should have. Now the diagnostics area is cleared
before executing RETURN. This prevents a condition in a
nested function call from incorrectly propagating to an
outer scope. It also means there is no way to return an
SQL warning from a stored function. This change is not
backward compatible, but the resulting behavior is more
like standard SQL.

+ When an SQL HANDLER was activated, the handled condition
was immediately removed from the diagnostics area.
Consequently, any SQL diagnostic statement executed in
the handler was unable to examine the condition that
triggered the handler.

+ If multiple handlers existed at the same level within a
stored program, the wrong one could be chosen.

+ If an error occurred in a context where different
handlers were present at different levels of nesting, an
outer handler could be chosen rather than the innermost
one.

For more information, see Section 12.6.7.6, “Scope Rules for
Handlers.” (Bug #12951117, Bug #38806, Bug #11749343, Bug
#55852, Bug #11763171, Bug #61392, Bug #12652873, Bug #11660,
Bug #11745196)

Fractional Seconds Handling

* Incompatible Change: MySQL now permits fractional seconds for
TIME, DATETIME, and TIMESTAMP values, with up to microseconds
(6 digits) precision. To define a column that includes a
fractional seconds part, use the syntax type_name(fsp), where
type_name is TIME, DATETIME, or TIMESTAMP, and fsp is the
fractional seconds precision. For example:
CREATE TABLE t1 (t TIME(3), dt DATETIME(6));
The fsp value, if given, must be in the range 0 to 6. A value
of 0 signifies that there is no fractional part. If omitted,
the default precision is 0. (This differs from the standard
SQL default of 6, for compatibility with previous MySQL
versions.)
The following items summarize the implications of this change.
See also Section 10.3.4, “Fractional Seconds in Time Values.”

+ For TIME, DATETIME, and TIMESTAMP columns, the encoding
and storage requirements in new tables differ from such
columns in tables created previously because these types
now include a fractional seconds part.

+ Syntax for temporal literals now produces temporal
values: DATE ‘str’, TIME ‘str’, and TIMESTAMP ‘str’, and
the ODBC-syntax equivalents. Previously, the temporal
type keyword was ignored and these constructs produced
the string value.

+ Functions that take temporal arguments accept values with
fractional seconds. Return values from temporal functions
include fractional seconds as appropriate.

+ Three INFORMATION_SCHEMA tables, COLUMNS, PARAMETERS, and
ROUTINES, now have a DATETIME_PRECISION column. Its value
is the fractional seconds precision for TIME, DATETIME,
and TIMESTAMP columns, and NULL for other data types.

+ The C API accommodates fractional seconds as follows:
o In the MYSQL_FIELD column metadata structure, the
decimals member indicates the fractional seconds
precision for TIME, DATETIME, and TIMESTAMP columns.
Clients can determine whether a result set temporal
column has a fractional seconds part by checking for
a nonzero decimals value in the corresponding
MYSQL_FIELD structure. Previously, the decimals
member indicated the precision for numeric columns
and was zero otherwise.
o In the MYSQL_TIME structure used for the binary
protocol, the second_part member indicates the
microseconds part for TIME, DATETIME, and TIMESTAMP
columns. Previously, the second_part member was
unused.
In some cases, previously accepted syntax may produce
different results. The following items indicate where existing
code may need to be changed to avoid problems:

+ Some expressions produce results that differ from
previous results. Examples: The timestamp system variable
returns a value that includes a microseconds fractional
part rather than an integer. Functions that return a
result that includes the current time (such as CURTIME(),
SYSDATE(), or UTC_TIMESTAMP()) interpret an argument as
an fsp value and the return value includes a fractional
seconds part of that many digits. Previously, these
functions permitted an argument but ignored it.

+ TIME values are converted to DATETIME by adding the time
to the current date. (This means that the date part of
the result differs from the current date if the time
value is outside the range from ’00:00:00′ to
’23:59:59′.) Previously, conversion of TIME values to
DATETIME was unreliable. See Section 10.3.5, “Conversion
Between Date and Time Types.”

+ TIMESTAMP(N) was permitted in old MySQL versions, but N
was a display width rather than fractional seconds
precision. Support for this behavior was removed in MySQL
5.5.3, so applications that are reasonably up to date
should not be subject to this issue. Otherwise, code must
be rewritten.

Note
There may be problems replicating from a master server that
understands fractional seconds to an older slave that does
not:

+ For CREATE TABLE statements containing columns that have
an fsp value greater than 0, replication will fail due to
parser errors.

+ Statements that use temporal data types with an fsp value
of 0 will work for with statement-based logging but not
row-based logging. In the latter case, the data types
have binary formats and type codes on the master that
differ from those on the slave.

+ Some expression results will differ on master and slave.
For example, expressions that involve the timestamp
system variable or functions that return the current time
have different results, as described earlier.
(Bug #8523, Bug #11745064)

Optimizer Features

* These query optimizer improvements were implemented:

+ The optimizer detects and optimizes away these useless
query parts within IN/ALL/SOME/EXISTS subqueries:

o DISTINCT
o GROUP BY, if there is no HAVING clause and no
aggregate functions
o ORDER BY, which has no effect because LIMIT is not
supported in these subqueries

Performance Schema Notes

* The Performance Schema has these additions:

+ The Performance Schema now permits instrument and
consumer configuration at server startup, which
previously was possible only at runtime using UPDATE
statements for the setup_instruments and setup_consumers
tables. This change was made because configuration at
runtime is too late to disable instruments that have
already been initialized during server startup. For
example, the wait/sync/mutex/sql/LOCK_open mutex is
initialized once during server startup, so attempts to
disable the corresponding instrument at runtime have no
effect.

To control an instrument at server startup, use an option
of this form:

–performance_schema_instrument=’instrument_name=value’

Here, instrument_name is an instrument name such as
wait/sync/mutex/sql/LOCK_open, and value is one of these
values:

o off, false, or 0: Disable the instrument
o on, true, or 1: Enable and time the instrument
o counted: Enable and count (rather than time) the
instrument

Each –performance_schema_instrument option can specify
only one instrument name, but multiple instances of the
option can be given to configure multiple instruments. In
addition, patterns are permitted in instrument names to
configure instruments that match the pattern. To
configure all condition synchronization instruments as
enabled and counted, use this option:

–performance_schema_instrument=’wait/synch/cond/%=counted’

To disable all instruments, use this option:
–performance_schema_instrument=’%=off’

Longer instrument name strings take precedence over
shorter pattern names, regardless of order. For
information about specifying patterns to select
instruments, see Section 19.2.3.2.2, “Naming Instruments
or Consumers for Filtering Operations.”

An unrecognized instrument name is ignored. It is
possible that a plugin installed later may create the
instrument, at which time the name is recognized and
configured.

To control a consumer at server startup, use an option of
this form:

–performance_schema_consumer_consumer_name=value

Here, consumer_name is a consumer name such as
events_waits_history, and value is one of these values:

o off, false, or 0: Do not collect events for the
consumer
o on, true, or 1: Collect events for the consumer

For example, to enable the events_waits_history consumer,
use this option:

–performance_schema_consumer_events_waits_history=on

The permitted consumer names can be found by examining
the setup_consumers table. Patterns are not permitted.
Along with the preceding changes to permit configuration
at server startup, the default instrument and consumer
configuration has changed. Previously, all instruments
and consumers were enabled by default. Now, instruments
are disabled except the statement, I/O, and idle
instruments. Consumers are disabled except the global,
thread, and statement consumers. These changes produce a
default configuration with minimal overhead.

+ Tables that have an EVENT_ID column now also have an
END_EVENT_ID column to support determination of nested
event relationships:

o events_waits_current, events_waits_history,
events_waits_history_long

o events_stages_current, events_stages_history,
events_stages_history_long

o events_statements_current,
events_statements_history,
events_statements_history_long

As before, EVENT_ID is populated with the thread current
event counter when an event starts. In addition,
END_EVENT_ID is NULL until the event ends, at which point
it is set to the new thread current event counter. This
permits the relationship “event A is included in event B”
to be determined using the following expression, without
having to follow each inclusion relationship using
NESTING_EVENT_ID:

A.EVENT_ID<= B.EVENT_ID AND B.END_EVENT_ID<= A.END_EVENT_ID

+ The Performance Schema aggregates file I/O operations in
two places, the events_waits_summary_xxx tables and the
file_summary_xxx tables. It was possible to join the
events_waits_summary_global_by_event_name table to the
file_summary_by_event_name by using the EVENT_NAME
column. However, it was not possible to do the same with
the events_waits_summary_by_instance and
file_summary_by_instance tables because the former uses
OBJECT_INSTANCE_BEGIN as the instance identifier and the
latter uses FILE_NAME. This means that it was possible to
obtain both file I/O latency and usage per file, but not
to correctly correlate latency to usage when there was
more than one form of file (such as multiple redo logs,
table files, and so forth).

To address this issue, the file_summary_by_instance table
now has an OBJECT_INSTANCE_BEGIN column. In addition,
both file_summary_by_instance and
file_summary_by_event_name have additional aggregation
columns (such as timer wait information), which in many
cases makes it possible to obtain the desired summary
information without need for a join at all.

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.

For more information, see Chapter 19, “MySQL Performance
Schema.”

Functionality Added or Changed

* Replication: Previously, replication slaves could connect to
the master server only through master accounts that use native
authentication. Now replication slaves can also connect
through master accounts that use nonnative authentication if
the required client-side plugin is installed on the slave side
in the directory named by the slave plugin_dir system
variable. (Bug #12897501)

* The optimizer trace capability now tracks temporary tables
created by the server during statement execution. (Bug
#13400713)

* Performance of metadata locking operations on Windows XP
systems was improved by instituting a cache for metadata lock
objects. This permits the server to avoid expensive operations
for creation and destruction of synchronization objects on XP.
A new system variable, metadata_locks_cache_size, permits
control over the size of the cache. The default size is 1024.
(Bug #12695572)

* Upgrading from an Advanced GPL RPM package to an Advanced RPM
package did not work. Now on Linux it is possible to use rpm
-U to replace any installed MySQL product by any other of the
same release family. It is not necessary to remove the old
produce with rpm -e first. (Bug #11886309)

* The make_win_bin_dist script is no longer used and has been
removed from MySQL distributions and the manual. (Bug #58241)

* MEMORY table creation time is now available in the CREATE_TIME
column of the INFORMATION_SCHEMA.TABLES table and the
Create_time column of SHOW TABLE STATUS output. (Bug #51655,
Bug #11759349)

* Previously, MySQL servers from 5.1 and up refused to open
ARCHIVE tables created in 5.0 because opening them caused a
server crash. The server now can open 5.0 ARCHIVE tables, and
REPAIR TABLE updates them to the format used in 5.6. However,
the recommended upgrade procedure is still to dump 5.0 ARCHIVE
tables before upgrading and reload them after upgrading. (Bug
#48633, Bug #11756687)

* The MySQL code base was changed to permit use of the C++
Standard Library and to enable exceptions and runtime type
information (RTTI). This change has the following
implications:

+ Libraries and executables depend on some C++ standard
library. On Linux, this has not been the case previously.
On Solaris, the default dependency has changed from the
default library to libstlport, which is now included with
binary distributions for users whose system does not have
it.

+ The -fno-rtti and -fno-exceptions options are no longer
used to build plugins, such as storage engines. Users who
write their own plugins should omit these options if they
were using tem.

+ C++ users who compile from source should set CXX to a C++
compiler rather than a C compiler. For example, use g++
rather than gcc. This includes the server as well as
client programs.

+ mysql_config now has a –cxxflags option. This is like
the –cflags option, but produces flags appropriate for a
C++ compiler rather than a C compiler.

+ User-defined functions can be written in C++ using
standard library features.

* New optimizations apply to read-only InnoDB transactions. See
Section 13.2.5.2.2, “Optimizations for Read-Only Transactions”
for details. The new optimizations make autocommit more
applicable to InnoDB queries than before, as a way to signal
that a transaction is read-only because it is a
single-statement SELECT.

* You can now set the InnoDB page size for uncompressed tables
to 8KB or 4KB, as an alternative to the default 16KB. This
setting is controlled by the innodb_page_size configuration
option. You specify the size when creating the MySQL instance.
All InnoDB tablespaces within an instance share the same page
size. Smaller page sizes can help to avoid redundant or
inefficient I/O for certain combinations of workload and
storage devices, particularly SSD devices with small block
sizes.

* MySQL now supports FULLTEXT indexes for InnoDB tables. The
core syntax is very similar to the FULLTEXT capability from
earlier releases, with the CREATE TABLE and CREATE INDEX
statements, and MATCH() … AGAINST() clause in the SELECT
statement. The new @ operator allows proximity searches for
terms that are near each other in the document. The detailed
search processing is controlled by a new set of configuration
options: innodb_ft_enable_stopword,
innodb_ft_server_stopword_table,
innodb_ft_user_stopword_table, innodb_ft_cache_size,
innodb_ft_min_token_size, and innodb_ft_max_token_size. You
can monitor the workings of the InnoDB full-text search system
by querying new INFORMATION_SCHEMA tables:
innodb_ft_default_stopword, innodb_ft_index_table,
innodb_ft_index_cache, innodb_ft_config, innodb_ft_deleted,
and innodb_ft_being_deleted.

Bugs Fixed

* Incompatible Change: Replication: The statements in the
following list are now marked as unsafe for statement-based
replication. This is due to the fact that each of these
statements depends on the results of a SELECT statement whose
order cannot always be determined. When using STATEMENT
logging mode, a warning is issued in the binary log for any of
these statements; when using MIXED logging mode, the statement
is logged using the row-based format.

+ INSERT … SELECT … ON DUPLICATE KEY UPDATE
+ REPLACE … SELECT
+ CREATE TABLE … IGNORE SELECT
+ CREATE TABLE … REPLACE SELECT
+ INSERT IGNORE … SELECT
+ UPDATE IGNORE

When upgrading, you should note the use of these statements in
your applications, keeping in mind that a statement that
inserts or replaces rows obtained from a SELECT can take up
many times as much space in the binary log when logged using
row-based format than when only the statement itself is
logged. Depending on the number and size of the rows selected
and inserted (or replaced) by any such statements, the
difference in size of the binary log after the logging of
these statements is switched from statement-based to row-based
can potentially be several orders of magnitude. See Section
15.1.2.1, “Advantages and Disadvantages of Statement-Based and
Row-Based Replication.” (Bug #11758262, Bug #50439)

* Incompatible Change: Previously, “Aborted connection” errors
were written to the error log based on the session value of
log_warnings, which permitted users with minimal privileges to
cause many messages to be written to the log unless restricted
by the MAX_CONNECTIONS_PER_HOUR resource limit. Now this
logging is based on the global log_warnings variable. There
are no remaining uses of the session log_warnings variable, so
it has been removed that the variable has only a global value.
(Bug #53466, Bug #11761014)

* Important Change: InnoDB Storage Engine: Data from BLOB
columns could be lost if the server crashed at a precise
moment when other columns were being updated in an InnoDB
table. (Bug #12704861)

* InnoDB Storage Engine: This fix improves the performance of
instrumentation code for InnoDB buffer pool operations. (Bug
#12950803, Bug #62294)

* InnoDB Storage Engine: Unused functions were removed from the
internal InnoDB code related to mini-transactions, to clarify
the logic. (Bug #12626794, Bug #61240)

* InnoDB Storage Engine: Lookups using secondary indexes could
give incorrect matches under a specific set of conditions. The
conditions involve an index defined on a column prefix, for a
BLOB or other long column stored outside the index page, with
a table using the Barracuda file format. (Bug #12601439)

* InnoDB Storage Engine: This fix corrects cases where the MySQL
server could hang or abort with a long semaphore wait message.
(This is a different issue than when these symptoms occurred
during a CHECK TABLE statement.) (Bug #11766591, Bug #59733)

* Partitioning: CHECKSUM TABLE returned 0 for a partitioned
table unless the statement was used with the EXTENDED option.
(Bug #11933226, Bug #60681)

* Partitioning: Error 1214 (ER_TABLE_CANT_HANDLE_FT), given when
trying to use a FULLTEXT index with a partitioned table,
displayed the misleading text The used table type doesn’t
support FULLTEXT indexes was misleading and has been replaced
with Error 1752 (ER_FULLTEXT_NOT_SUPPORTED_WITH_PARTITIONING)
which shows the more accurate FULLTEXT index is not supported
for partitioned tables. (Bug #11763825, Bug #56590)

* Replication: The value set for the slave_parallel_workers
system variable (or the corresponding –slave-parallel-workers
server option) was not always honored correctly; in such cases
a random value was used. (Bug #13334470)

* Replication: Several warnings and informational messages were
revised for typographic errors and clarity. (Bug #12947248,
Bug #12978113)

* Replication: A replication master could send damaged events to
slaves after the binary log disk on the master became full. To
correct this issue, only complete events are now pushed by the
master dump thread to the slave I/O thread. In addition, the
error text that the master sends to the slave when an
incomplete event is found now states that the incomplete event
may have been caused by running out of disk space on the
master, and provides coordinates of the first and the last
event bytes read. (Bug #11747416, Bug #32228)

* A derived table with more than 64 columns caused a server
crash. (Bug #13354889)

* Writes to the slow log involved a call to thd->current_utime()
even if no log entries ended up being written, unnecessarily
reducing performance. (Bug #13326965)

* Rounding DBL_MAX returned DBL_MAX, not ‘inf’. (Bug #13261955)

* Access privileges were checked for each stored program
instruction, even if the instruction used no tables, resulting
in reduced performance. (Bug #13251277)

* The error message for ER_EVENT_CANNOT_ALTER_IN_THE_PAST was
incorrect. (Bug #13247871)

* During the table-opening process, memory was allocated and
later freed that was needed view loading, even for statements
that did not use views. These unnecessary allocation and free
operations are no longer done. (Bug #13116518)

* Subqueries with OUTER JOIN could return incorrect results if
the subquery referred to a column from another SELECT. (Bug
#13068506)

* The Performance Schema nested some network I/O events within
the wrong statement. (Bug #12981100)

* mysql_plugin mishandled the –plugin-ini, –mysqld, and
–my-print-defaults options under some circumstances. (Bug
#12968815)

* mysql_plugin returned the wrong error code from failed server
bootstrap execution. (Bug #12968567)

* Internal conversion of zero to binary and back could yield a
result with incorrect precision. (Bug #12911710)

* Valgrind warnings generated by filesort operations were fixed.
(Bug #12856915)

* Partitioning: Using ALTER TABLE to remove partitioning from a
valid MyISAM table could corrupt it. (Bug #52599, Bug
#11760213)

* An IN-to-EXISTS subquery transformation could yield incorrect
results if the outer value list contained NULL. (Bug
#12838171)

* With index condition pushdown enabled, STRAIGHT_JOIN queries
could produce incorrect results. (Bug #12822678, Bug
#12724899)

* The result of ROUND() was incorrect for certain numbers. (Bug
#12744991)

* A warning resulting from use of SPACE() referred to REPEAT()
in the warning message. (Bug #12735829)

* IN and EXISTS subqueries with DISTINCT and ORDER BY could
return incorrect results. (Bug #12709738)

* Several improvements were made to the libedit library bundled
with MySQL distributions, and that is available for all
platforms that MySQL supports except Windows.

+ Navigation keys did not work for UTF-8 input.

+ Word navigation and delete operations did not work for
UTF-8 input with Cyrillic characters.

+ Nonlatin characters were corrupted in overwrite mode for
UTF-8 input.

+ Long queries caused the statement history file to become
corrupted.

+ The Alt key caused history operations to fail.

(Bug #12605400, Bug #12613725, Bug #12618092, Bug #12624155,
Bug #12617651, Bug #12605388)

* SELECT SQL_BUFFER_RESULT query results included too many rows
if a GROUP BY clause was optimized away. (Bug #12578908)

* mysqldump –all-databases did not dump the replication log
tables. (They could be dumped only by naming them explicitly
when invoking mysqldump, and using the –master-data option.)

As a result of the fix for this problem, it is now possible to
execute statements requiring read locks on the replication log
tables at any time, while any statements requiring a write
lock on either or both of these tables are disallowed whenever
replication is in progress. For more information, see Section
15.2.2, “Replication Relay and Status Logs.” (Bug #12402875,
Bug #60902)

* mysqld_safe did not properly check for an already running
instance of mysqld. (Bug #11878394)

* Replication: –replicate-rewrite-db=from_name->to_name did not
work correctly when the name of the source database
(from_name) consisted of only a single character. (Bug #34332,
Bug #11747866)

* If index condition pushdown access was chosen and then
abandoned, some variables were not cleared, leading to
incorrect query results. (Bug #62533)

* For a lower_case_table_names value of 1 or 2 and a database
having a mixed-case name, calling a stored function using a
fully qualified name including the database name failed. (Bug
#60347, Bug #11840395)

* mysql_upgrade did not upgrade the system tables or create the
mysql_upgrade_info file when run with the –write-binlog or
–skip-write-binlog option. (Bug #60223, Bug #11827359)

* A multiple-table UPDATE statement required the UPDATE
privilege on a view which was only read if the view was
processed using the merge algorithm. (Bug #59957, Bug
#11766767)

* When a join operation contained a view, the optimizer
sometimes failed to associate the view’s WHERE clause
with the first table or view in a join when it was
possible to do so, resulting in a less efficient query.
(Bug #59696, Bug #11766559)

* An assertion was raised when selecting from a view that
selects from a view that used a user-defined function that had
been deleted. (Bug #59546, Bug #11766440)

* The help message for mysql_install_db did not indicate that it
supports the –defaults-file, –defaults-extra-file and
–no-defaults options. (Bug #58898, Bug #11765888)

* mysql_install_db printed the –skip-grant-tables server option
as –skip-grant in one of its error messages. (Bug #58534, Bug
#11765553)

* An assertion designed to detect zero-length sort keys also was
raised when the entire key set fit in memory. (Bug #58200, Bug
#11765254)

* During optimization, ZEROFILL values may be converted to
string constants. However, CASE expressions did not handle
switching data types after the planning stage, leading to CASE
finding a null pointer instead of its argument. (Bug #57135,
Bug #11764313)

* If a plugin was uninstalled, thread local variables for plugin
variables of string type with wth PLUGIN_VAR_MEMALLOC flag
were not freed. (Bug #56652, Bug #11763882)

* Deadlock could occur when these four things happened at the
same time: 1) An old dump thread was waiting for the binary
log to grow. 2) The slave server that replicates from the old
dump thread tried to reconnect. During reconnection, the new
dump thread tried to kill the old dump thread. 3) A KILL
statement tried to kill the old dump thread. 4) An INSERT
statement caused a binary log rotation. (Bug #56299, Bug
#11763573)

* myisampack could create corrupt FULLTEXT indexes when
compressing tables. (Bug #53646, Bug #11761180)

* The SQL_BIG_RESULT modifier could change the results for
queries that included a GROUP BY clause. (Bug #53534, Bug
#11761078)

* ARCHIVE tables with NULL columns could cause server crashes or
become corrupt under concurrent load. (Bug #51252, Bug
#11758979)

* InnoDB used incorrect identifier quoting style in an error
message that resulted in an error if a user followed the
suggestion in the message. (Bug #49556, Bug #11757503)

* OPTIMIZE TABLE could corrupt MyISAM tables if myisam_use_mmap
was enabled. (Bug #49030, Bug #11757032)

* A query that selected a GROUP_CONCAT() function result could
return different values depending on whether an ORDER BY of
the function result was present. (Bug #41090, Bug #11750518)

* A linking problem prevented the FEDERATED storage engine
plugin from loading. (Bug #40942, Bug #11750417)

* Subqueries could return incorrect results when materialization
was enabled. (Bug #40037, Bug #11749901, Bug #12705660, Bug
#12908058)

* For debug builds, an assertion could be raised for ALTER
statements that performed a RENAME operation. This occurred
for storage engine handlertons that exposed the
HTON_FLUSH_AFTER_RENAME flag. (Bug #38028, Bug #11749050)

* The estimate of space required for filesort operations could
be too high, resulting in inefficient initialization. (Bug
#37359, Bug #11748783)

* An ALTER TABLE that included an ADD … AFTER operation to add
a new column after a column that had been modified earlier in
the statement failed to find the existing column. (Bug #34972,
Bug #11748057)

* For FEDERATED tables, loss of connection to the remote table
during some insert operations could cause a server crash. (Bug
#34660, Bug #11747970)

* For some queries, the index_merge access method was used even
when more expensive then ref access. (Bug #32254, Bug
#11747423)

MySQL 5.5 includes several high-impact enhancements to improve the performance and scalability of the MySQL Database, taking advantage of the latest multi-CPU and multi-core hardware and operating systems. In

addition, with release 5.5, InnoDB is now the default storage engine for the MySQL Database, delivering ACID transactions, referential integrity and crash recovery by default.

MySQL 5.5 also provides a number of additional enhancements including:

- Significantly improved performance on Windows, with various Windows specific features and improvements

- Higher availability, with new semi-synchronous replication and Replication Heart Beat

- Improved usability, with Improved index and table partitioning, SIGNAL/RESIGNAL support and enhanced diagnostics, including a new Performance Schema monitoring capability.

The following section lists the changes in the MySQL source code since the previous released version of MySQL 5.5.

Changes in MySQL 5.5.15 (28 July 2011)

Functionality Added or Changed

* The undocumented –all option for perror is deprecated and

will be removed in MySQL 5.6.

Bugs Fixed

* InnoDB Storage Engine: A failed CREATE INDEX operation for an

InnoDB table could result in some memory being allocated but

not freed. This memory leak could affect tables created with

the ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED setting. (Bug

#12699505)

* Partitioning: Auto-increment columns of partitioned tables

were checked even when they were not being written to. In

debug builds, this could lead to a server crash. (Bug

#11765667, Bug #58655)

* Partitioning: The UNIX_TIMESTAMP() function was not treated as

a monotonic function for purposes of partition pruning. (Bug

#11746819, Bug #28928)

* Compiling the server with maintainer mode enabled failed for

gcc 4.6 or higher. (Bug #12727287)

* The option-parsing code for empty strings leaked memory. (Bug

#12589928)

* Previously, an inappropriate error message was produced if a

multiple-table update for an InnoDB table with a clustered

primary key would update a table through multiple aliases, and

perform an update that may physically move the row in at least

one of these aliases. Now the error message is: Primary

key/partition key update is not permitted since the table is

updated both as ‘tbl_name1′ and ‘tbl_name2′ (Bug #11882110)

See also Bug #11764529.

* Replication: If a LOAD DATA INFILE statement—replicated

using statement-based replication—featured a SET clause, the

name-value pairs were regenerated using a method

(Item::print()) intended primarily for generating output for

statements such as EXPLAIN EXTENDED, and which cannot be

relied on to return valid SQL. This could in certain cases

lead to a crash on the slave.

To fix this problem, the server now names each value in its

original, user-supplied form, and uses that to create LOAD

DATA INFILE statements for statement-based replication. (Bug

#60580, Bug #11902767)

See also Bug #34283, Bug #11752526, Bug #43746.

* ALTER TABLE {MODIFY|CHANGE} … FIRST did nothing except

rename columns if the old and new versions of the table had

exactly the same structure with respect to column data types.

As a result, the mapping of column name to column data was

incorrect. The same thing happened for ALTER TABLE DROP COLUMN

… ADD COLUMN statements intended to produce a new version of

the table with exactly the same structure as the old version.

(Bug #61493, Bug #12652385)

* Incorrect handling of metadata locking for FLUSH TABLES WITH

READ LOCK for statements requiring prelocking caused two

problems:

+ Execution of any data-changing statement that required

prelocking (that is, involved a stored function or

trigger) as part of a transaction slowed down somewhat

all subsequent statements in the transaction. Performance

in a transaction that periodically involved such

statements gradually degraded over time.

+ Execution of any data-changing statement that required

prelocking as part of a transaction prevented a

concurrent FLUSH TABLES WITH READ LOCK from proceeding

until the end of the transaction rather than at the end

of the particular statement.

(Bug #61401, Bug #12641342)

* The fractional part of the “Queries per second” value could be

displayed incorrectly in MySQL status output (for example, in

the output from mysqladmin status or the mysql STATUS

command). (Bug #61205, Bug #12565712)

* LOAD DATA INFILE incorrectly parsed relative data file path

names that ascended more than three levels in the file system

and as a consequence was unable to find the file. (Bug #60987,

Bug #12403662)

* For unknown users, the native password plugin reported

incorrectly that no password had been specified even when it

had. (Bug #59792, Bug #11766641)

* For MyISAM tables, attempts to insert incorrect data into an

indexed GEOMETRY column could result in table corruption. (Bug

#57323, Bug #11764487)

* In debug builds, Field_new_decimal::store_value() was subject

to buffer overflows. (Bug #55436, Bug #11762799)

* A race condition between loading a stored routine using the

name qualified by the database name and dropping that database

resulted in a spurious error message: The table mysql.proc is

missing, corrupt, or contains bad data (Bug #47870, Bug

#11756013)

MySQL 5.5 includes several high-impact enhancements to improve the performance and scalability of the MySQL Database, taking advantage of the latest multi-CPU and multi-core hardware and operating systems. In addition, with release 5.5, InnoDB is now the default storage engine for the MySQL Database, delivering ACID transactions, referential integrity and crash recovery by default.

MySQL 5.5 also provides a number of additional enhancements including:

- Significantly improved performance on Windows, with various Windows specific features and improvements

- Higher availability, with new semi-synchronous replication and Replication Heart Beat

- Improved usability, with Improved index and table partitioning, SIGNAL/RESIGNAL support and enhanced diagnostics, including a new Performance Schema monitoring capability.

Changes in MySQL 5.5.14 :

Functionality added or changed:

* CMake configuration support on Linux now provides a boolean

ENABLE_GCOV option to control whether to include support for

gcov. (Bug #12549572)

* InnoDB now permits concurrent reads while creating a secondary

index. (Bug #11853126)

See also Bug #11751388, Bug #11784056, Bug #11815600.

* Client programs now display more information for SSL errors to

aid in diagnosis and debugging of connection problems. (Bug

#21287, Bug #11745920)

* In the audit plugin interface, the event_class member was

removed from the mysql_event_general structure and the calling

sequence for the notification function changed. Originally,

the second argument was a pointer to the event structure. The

function now receives this information as two arguments: an

event class number and a pointer to the event. Corresponding

to these changes, MYSQL_AUDIT_INTERFACE_VERSION was increased

to 0×0300.

The plugin_audit.h header file, and the NULL_AUDIT example

plugin in the plugin/audit_null directory have been modified

per these changes. See Section 21.2.4.7, “Writing Audit

Plugins.”

Bugs fixed:

* Replication: A mistake in thread cleanup could cause a

replication master to crash. (Bug #12578441)

* Replication: When using row-based replication and attribute

promotion or demotion (see Section 15.4.1.6.2, “Replication of

Columns Having Different Data Types”), memory allocated

internally for conversion of BLOB columns was not freed

afterwards. (Bug #12558519)

* Adding support for Windows authentication to libmysql

introduced a link dependency on the system Secur32 library.

The Microsoft Visual C++ link information was modified to pull

in this library automatically. (Bug #12612143)

* In some cases, memory allocated for

Query_tables_list::sroutines() was not freed properly. (Bug

#12429877)

* After the fix for Bug#11889186, MAKEDATE() arguments with a

year part greater than 9999 raised an assertion. (Bug

#12403504)

* An assertion could be raised due to a missing NULL value check

in Item_func_round::fix_length_and_dec(). (Bug #12392636)

* An assertion could be raised during two-phase commits if the

binary log was used as the transaction coordinator log. (Bug

#12346411)

* A problem introduced in 5.5.11 caused very old (MySQL 4.0)

clients to be unable to connect to the server. (Bug #61222,

Bug #12563279)

* Using CREATE EVENT IF NOT EXISTS for an event that already

existed and was enabled caused multiple instances of the event

to run. (Bug #61005, Bug #12546938)

* An embedded client would abort rather than issue an error

message if it issued a TEE command (\T file_name) and the

directory containing the file did not exist. This occurred

because the wrong error handler was called. (Bug #57491, Bug

#11764633)

* On some platforms, the Incorrect value: xxx for column yyy at

row zzz error produced by LOAD DATA INFILE could have an

incorrect value of zzz. (Bug #46895, Bug #11755168)

* An attempt to install nonexistent files during installation

was corrected. (Bug #43247, Bug #11752142)

* On FreeBSD 64-built builds of the embedded server, exceptions

were not prevented from propagating into the embedded

application. (Bug #38965, Bug #11749418)

=======================================================================

Changes in MySQL 5.1.58 (July 5th, 2011)

Bugs fixed:

* InnoDB Storage Engine: If the server crashed while an XA

transaction was prepared but not yet committed, the

transaction could remain in the system after restart, and

cause a subsequent shutdown to hang. (Bug #11766513, Bug

#59641)

* Partitioning: When executing a row-ordered retrieval index

merge, the partitioning handler used memory from that

allocated for the table, rather than allocated to the

query, causing table object memory not to be freed until the

table was closed. (Bug #11766249, Bug #59316)

* Replication: When mysqlbinlog was invoked using

–base64-output=decode-row and –start-position=pos, (where

pos is a point in the binary log past the format description

log event), a spurious error of the type shown here was

generated:

malformed binlog: it does not contain any Format_description_log_event…

However, since there is nothing unsafe about not printing the

format description log event, the error has been removed for

this case. (Bug #12354268)

* Replication: Typographical errors appeared in the text of

several replication error messages. (The word “position” was

misspelled as “postion”.) (Bug #11762616, Bug #55229)

* After the fix for Bug#11889186, MAKEDATE() arguments with a

year part greater than 9999 raised an assertion. (Bug

#12403504)

* An assertion could be raised due to a missing NULL value check

in Item_func_round::fix_length_and_dec(). (Bug #12392636)

* In debug builds on Solaris, an assertion was raised if a

reverse IP lookup with gethostbyaddr_r() failed. (Bug

#12377872)

* MySQL did not build if configured with both –with-debug and

–with-libedit. (Bug #12329909)

* A problem introduced in 5.1.57 caused very old (MySQL 4.0)

clients to be unable to connect to the server. (Bug #61222,

Bug #12563279)

* Using CREATE EVENT IF NOT EXISTS for an event that already

existed and was enabled caused multiple instances of the event

to run. (Bug #61005, Bug #12546938)

* The incorrect max_length value for YEAR values could be used

in temporary result tables for UNION, leading to incorrect

results. (Bug #59343, Bug #11766270)

* In Item_func_in::fix_length_and_dec(), a Valgrind warning for

uninitialized values was corrected. (Bug #59270, Bug

#11766212)

* In ROUND() calculations, a Valgrind warning for uninitialized

memory was corrected. (Bug #58937, Bug #11765923)

* Valgrind warnings caused by comparing index values to an

uninitialized field were corrected. (Bug #58705, Bug

#11765713)

* LOAD DATA INFILE errors could leak I/O cache memory. (Bug

#58072, Bug #11765141)

* For LOAD DATA INFILE, multibyte character sequences could be

pushed onto a stack too small to accommodate them. (Bug

#58069, Bug #11765139)

* An embedded client would abort rather than issue an error

message if it issued a TEE command (\T file_name) and the

directory containing the file did not exist. This occurred

because the wrong error handler was called. (Bug #57491, Bug

#11764633)

* In debug builds, Field_new_decimal::store_value() was subject

to buffer overflows. (Bug #55436, Bug #11762799)

* On Linux, the mysql client built using the bundled libedit did

not read ~/.editrc. (Bug #49967, Bug #11757855)

* The optimizer sometimes incorrectly processed HAVING clauses

for queries that did not also have an ORDER BY clause. (Bug

#48916, Bug #11756928)

* PROCEDURE ANALYZE() could leak memory for NULL results, and

could return incorrect results if used with a LIMIT clause.

(Bug #48137, Bug #11756242)

* On some platforms, the Incorrect value: xxx for column yyy at

row zzz error produced by LOAD DATA INFILE could have an

incorrect value of zzz. (Bug #46895, Bug #11755168)

* In MySQL 5.1 and up, if a table had triggers that used syntax

supported in 5.0 but not 5.1, the table became unavailable.

Now the table is marked as having broken triggers. (Bug

#45235, Bug #11753738)

* An attempt to install nonexistent files during installation

was corrected. (Bug #43247, Bug #11752142)

* On FreeBSD 64-built builds of the embedded server, exceptions

were not prevented from propagating into the embedded

application. (Bug #38965, Bug #11749418)

Version 6.1.6 is intended for use with versions of MySQL from 4.1 – 5.1.  It is not suitable for use with MySQL 5.5 or later.

This update includes more than 35 fixes from 6.1.5.  Please review the change log that is included with the product to determine the exact nature of the changes.