Public bug reported:

as lucid life comes to an end, it would nice to have at least the last version 
of mysql 5.1.x
especially with lots of InnoDB fixes ...

Bugs Fixed

InnoDB; Performance: Some data structures related to undo logging could
be initialized unnecessarily during a query, although they were only
needed under specific conditions. (Bug #14676084)

InnoDB; Performance: Optimized read operations for compressed tables by
skipping redundant tests. The check for whether any related changes
needed to be merged from the insert buffer was being called more often
than necessary. (Bug #14329288, Bug #65886)

InnoDB; Performance: Immediately after a table was created, a query
against it would not use a loose index scan. The same query might use a
loose index scan following an ALTER TABLE on the table. The fix improves
the accuracy of the cost estimate for queries involving the grouping
functions min() and max(), and prevents the query plan from being
changed by the ALTER TABLE statement. (The more stable query plan might
or might not use a loose index scan.) (Bug #14200010)

InnoDB; Partitioning: Previously, when attempting to optimize one or
more partitions of a partitioned table that used a storage engine that
does not support partition-level OPTIMIZE, such as InnoDB, MySQL
reported Table does not support optimize, doing recreate + analyze
instead, then re-created the entire table, but did not actually analyze
it. Now in such cases, the warning message is, Table does not support
optimize on partitions. All partitions will be rebuilt and analyzed. In
addition, the entire table is analyzed after first being rebuilt. (Bug
#11751825)

InnoDB: The status variable Innodb_buffer_pool_read_ahead_evicted could
show an inaccurate value, higher than expected, because some pages in
the buffer pool were incorrectly considered as being brought in by read-
ahead requests. (Bug #15859402, Bug #67476)

InnoDB: Creating an index on a CHAR column could fail for a table with a
character set with varying length, such as UTF-8, if the table was
created with the ROW_FORMAT=REDUNDANT clause. (Bug #15874001)

InnoDB: If the server crashed at a precise moment during an ALTER TABLE
operation that rebuilt the clustered index for an InnoDB table, the
original table could be inaccessible afterward. An example of such an
operation is ALTER TABLE ... ADD PRIMARY KEY The fix preserves the
original table if the server halts during this operation. You might
still need to rename the .ibd file manually to restore the original
table contents: in MySQL 5.6 and higher, rename from #sql-
ib$new_table_id.ibd to table_name.ibd within the database directory;
prior to MySQL 5.6, the temporary file to rename is table_name#1 or #2.
(Bug #14669848)

InnoDB: An error at the filesystem level, such as too many open files,
could cause an unhandled error during an ALTER TABLE operation. The
error could be accompanied by Valgrind warnings, and by this assertion
message:

Assertion `! is_set()' failed.
mysqld got signal 6 ; 
(Bug #14628410, Bug #16000909)

InnoDB: During shutdown, with the innodb_purge_threads configuration
option set greater than 1, the server could halt prematurely with this
error:

mysqld got signal 11
A workaround was to increase innodb_log_file_size and set 
innodb_purge_threads=1. The fix was backported to MySQL 5.5 and 5.1, although 
those versions do not have the innodb_purge_threads configuration option so the 
error was unlikely to occur. (Bug #14234028)

InnoDB: The value of the innodb_version variable was not updated
consistently for all server releases for the InnoDB Plugin in MySQL 5.1,
and the integrated InnoDB component in MySQL 5.5, 5.6, and higher. Since
InnoDB and MySQL Server development cycles are fully integrated and
synchronized, now the value returned by the innodb_version variable is
the same as for the version variable. (Bug #13463493, Bug #63435)

Partitioning: When used with a table having multiple columns in its
primary key, but partitioned by KEY using a column that was not part of
the primary key as the partitioning column, a query using an aggregate
function and DISTINCT such as SELECT SUM(DISTINCT pk_column_1) FROM
table WHERE pk_column_2 = constant was not handled correctly. (Bug
#14845133)

References: See also Bug #14495351. This bug was introduced by Bug
#13025132.

Replication: Repeated execution of CHANGE MASTER TO statements using
invalid MASTER_LOG_POS values could lead to errors and possibly a crash
on the slave. Now in such cases, the statement fails with a clear error
message. (Bug #11764602, Bug #57454)

Replication: If the disk becomes full while writing to the binary log,
the server hangs until space is freed up manually. It was possible after
this was done for the MySQL server to fail, due to an internal status
value being set when not needed. Now in such cases, rather than trying
to set this status, a warning is written in the error log instead. (Bug
#11753923, Bug #45449)

msdos : Dynamic file names (with colons) are no longer allowed. Static
file names using the Alternate Data Stream (ADS) NTFS functionality of
Microsoft Windows may continue to be used. (Bug #11761752)

Directory name manipulation could result in stack overflow on Mac OS X
and Windows. (Bug #16066243)

A buffer-handling problem in yaSSL was fixed. (Bug #15965288)

It was possible in theory for UpdateXML() to return NULL incorrectly.
(Bug #15948580)

References: See also Bug #13007062.

Metadata locking and table definition cache routines did not always
check length of names passed to them. (Bug #15954872)

Enabling the query cache during high client contention could cause the
server to exit. (Bug #14727815)

The server sometimes failed to respect MAX_CONNECTIONS_PER_HOUR limits
on user connections. (Bug #14627287)

Passing an unknown time zone specification to CONVERT_TZ() resulted in a
memory leak. (Bug #12347040)

For dumps of the mysql database, mysqldump skipped the event table
unless the --events option was given. To skip this table if that is
desired, use the --ignore-table option instead (Bug #55587, Bug
#11762933)

For MEMORY tables with HASH indexes, DELETE sometimes failed to delete
all applicable rows. (Bug #51763, Bug #11759445)

mysqld_safe used the nonportable -e test construct. (Bug #67976, Bug
#16046140)

UNION type conversion could incorrectly turn unsigned values into signed
values. (Bug #49003, Bug #11757005)

During the startup process, mysqld could incorrectly remove the PID file
of an already running mysqld. (Bug #23790, Bug #11746142)


http://dev.mysql.com/doc/relnotes/mysql/5.1/en/news-5-1-68.html

** Affects: mysql-5.1 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: upgrade-software-version

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https://bugs.launchpad.net/bugs/1154039

Title:
  update MySQL 5.1.68

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