MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
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Jan Lindström 58888e2c08 MDEV-6935: Change the default value for innodb_log_compressed_pages to false
Merge Facebook commit ca40b4417fd224a68de6636b58c92f133703fc68
authored by Steaphan Greene from https://github.com/facebook/mysql-5.6
Change the default value for innodb_log_compressed_pages to false

Logging these pages is a waste. We don't want this to be enabled.

One caution here: If the zlib version used by innodb is changed, but
the running version is still the previous version, and the running
version crashes, it is possible crash recovery could fail.

When crash recovery uses a zlib version at all different than the
version used by the crashed instance, it is possible that a redone
compression could fail, where the original did not, because the new
zlib version compresses the same data to a slightly larger size.

Because of the nature of compression, this is even possible when
upgrading to a version of zlib which actually peforms overall better
compression than the previous version.

If this happens, mysql will fail to recover, since a page split can
not be safely triggered during crash recovery.

So, either the exact zlib version must be controlled between builds,
or these rare recovery failures must be accepted. The cost of
logging these pages is quite high, so we consider this limitation to
be worthwhile.

This failure scenario can not happen if there was a clean shutdown.
This is only relevant to restarting crashed instances, or starting an
instance built via a hot backup too (XtraBackup).
2014-10-29 11:07:38 +02:00
BUILD
client Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
cmake Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
dbug
debian Added SST scripts to the server package. 2014-10-27 21:19:12 -04:00
Docs
extra Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
include Merge branch 'bb-10.1-merge' into 10.1 2014-10-16 00:30:29 +02:00
libmysql
libmysqld
libservices
man Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
mysql-test MDEV-6935: Change the default value for innodb_log_compressed_pages to false 2014-10-29 11:07:38 +02:00
mysys Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
mysys_ssl
packaging
pcre
plugin Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
randgen/conf
scripts Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
sql MDEV-12 OpenGIS: create required tables: GeometryColumns, related views. 2014-10-21 12:25:47 +05:00
sql-bench Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
sql-common Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
storage MDEV-6935: Change the default value for innodb_log_compressed_pages to false 2014-10-29 11:07:38 +02:00
strings
support-files Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
tests
unittest
vio
win
wsrep
zlib
.gitattributes
.gitignore after-merge fixes 2014-10-15 22:42:08 +02:00
BUILD-CMAKE
CMakeLists.txt Merge 10.0.14 into 10.1 2014-10-15 12:59:13 +02:00
config.h.cmake MDEV-6648: InnoDB: Add support for 4K sector size if supported 2014-10-29 11:07:11 +02:00
configure.cmake MDEV-6648: InnoDB: Add support for 4K sector size if supported 2014-10-29 11:07:11 +02:00
COPYING
COPYING.LESSER
COPYING.thirdparty
CREDITS
EXCEPTIONS-CLIENT
INSTALL-SOURCE
INSTALL-WIN-SOURCE
KNOWN_BUGS.txt
README
VERSION Increase the version number 2014-10-28 14:49:31 +04:00

MariaDB is designed as a drop-in replacement of MySQL(R) with more
features, new storage engines, fewer bugs, and better performance.

MariaDB is brought to you by the MariaDB foundation.
Please read the file CREDITS for details about the MariaDB foundation,
and who is developing MariaDB.

MariaDB is developed by many of the original developers of MySQL who
now work for MariadB foundation and SkySQL Ab, and by many people in
the community.

MySQL, which is the base of MariaDB, is a product and trademark of Oracle
Corporation, Inc. For a list of developers and other contributors,
see the Credits appendix.  You can also do 'SHOW authors' to get a
list of active contributors.

A description of the MariaDB project and a manual can be found at:
http://mariadb.org/
https://mariadb.com/kb/en/
https://mariadb.com/kb/en/mariadb-vs-mysql-features/
https://mariadb.com/kb/en/mariadb-versus-mysql-features/
https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/

As MariaDB is a full replacement of MySQL, the MySQL manual at
http://dev.mysql.com/doc is generally applicable.

More help is available from the Maria Discuss mailing list
https://launchpad.net/~maria-discuss
and the #maria IRC channel on Freenode.

***************************************************************************

NOTE: 

MariaDB is specifically available only under version 2 of the GNU
General Public License (GPLv2). (I.e. Without the "any later version"
clause.) This is inherited from MySQL. Please see the README file in
the MySQL distribution for more information.

License information can be found in the COPYING, COPYING.LESSER,
and COPYING.thirdparty files.

***************************************************************************

IMPORTANT:

Bug and/or error reports regarding MariaDB should be submitted at
http://mariadb.org/jira

Bugs in the MySQL code can also be submitted at http://bugs.mysql.com

The code for MariaDB, including all revision history, can be found at:
https://github.com/MariaDB/server

***************************************************************************