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CVS commit: wip/mysql5-embedded
Module name: wip
Committed by: thomasklausner
Date: Tue Dec 15 14:55:29 UTC 2009
wip/mysql5-embedded: Makefile distinfo
Update to 5.1.41:
C.1.2. Changes in MySQL 5.1.41 (05 November 2009)
InnoDB Plugin Notes:
* InnoDB Plugin has been upgraded to version 1.0.5. This version is
considered of Release Candidate (RC) quality. The InnoDB Plugin Change
History may contain information in addition to those changes reported
Functionality added or changed:
* The InnoDB buffer pool is divided into two sublists: A new sublist
containing blocks that are heavily used by queries, and an old sublist
containing less-used blocks and from which candidates for eviction are
taken. In the default operation of the buffer pool, a block when read
in is loaded at the midpoint and then moved immediately to the head of
the new sublist as soon as an access occurs. In the case of a table
scan (such as performed for a mysqldump operation), each block read by
the scan ends up moving to the head of the new sublist because
multiple rows are accessed from each block. This occurs even for a
one-time scan, where the blocks are not otherwise used by other
queries. Blocks may also be loaded by the read-ahead background thread
and then moved to the head of the new sublist by a single access.
These effects can be disadvantageous because they push blocks that are
in heavy use by other queries out of the new sublist to the old
sublist where they become subject to eviction.
InnoDB Plugin now provides two system variables that enable LRU
Specifies the approximate percentage of the buffer pool used for
the old block sublist. The range of values is 5 to 95. The
default value is 37 (that is, 3/8 of the pool).
Specifies how long in milliseconds (ms) a block inserted into the
old sublist must stay there after its first access before it can
be moved to the new sublist. The default value is 0: A block
inserted into the old sublist moves immediately to the new
sublist the first time it is accessed, no matter how soon after
insertion the access occurs. If the value is greater than 0,
blocks remain in the old sublist until an access occurs at least
that many ms after the first access. For example, a value of 1000
causes blocks to stay in the old sublist for 1 second after the
first access before they become eligible to move to the new
sublist. See Section 7.4.6, "The InnoDB Buffer Pool"
For additional information, see Section 7.4.6, "The InnoDB Buffer
* For InnoDB Plugin, two new status variables have been added to SHOW
STATUS output. Innodb_buffer_pool_read_ahead and
Innodb_buffer_pool_read_ahead_evicted indicate the number of pages
read in by the InnoDB read-ahead background thread, and the number of
such pages evicted without ever being accessed, respectively. Also,
the status variables Innodb_buffer_pool_read_ahead_rnd and
Innodb_buffer_pool_read_ahead_seq status variables have been removed.
The built-in version of InnoDB is not affected by these changes.
* The server now supports a Debug Sync facility for thread
synchronization during testing and debugging. To compile in this
facility, configure MySQL with the --enable-debug-sync option. The
debug_sync system variable provides the user interface Debug Sync.
mysqld and mysql-test-run.pl support a --debug-sync-timeout option to
enable the facility and set the default synchronization point timeout.
* Important Change: Security Fix: Additional corrections were made for
the symlink-related privilege problem originally addressed in MySQL
5.1.24. The original fix did not correctly handle the data directory
path name if it contained symlinked directories in its path, and the
check was made only at table-creation time, not at table-opening time
later. (Bug#32167, CVE-2008-2079)
See also Bug#39277.
* Security Fix: MySQL clients linked against OpenSSL did not check
server certificates presented by a server linked against yaSSL.
(and a few hundred lines more)
To generate a diff of this commit:
cvs -z3 rdiff -u -r1.5 -r1.6 wip/mysql5-embedded/distinfo
cvs -z3 rdiff -u -r1.9 -r1.10 wip/mysql5-embedded/Makefile
To view a diff of this commit:
Please note that diffs are not public domain; they are subject to the
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