- MariaDB\ 71.8%
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8bb4ea2e6f
Thanks to MDEV-12699, the doublewrite buffer will only be needed in those cases when a page is being updated in the data file. If the page had never been written to the data file since it was initialized, then recovery will be able to reconstruct the page based solely on the contents of the redo log files. The doublewrite buffer is only really needed when recovery needs to read the page in order to apply redo log. Note: As noted in MDEV-19739, we cannot safely disable the doublewrite buffer if any MLOG_INDEX_LOAD records were written in the past or will be written in the future. These records denote that redo logging was disabled for some pages in a tablespace. Ideally, we would have the setting innodb_log_optimize_ddl=OFF by default, and would not allow it to be set while the server is running. If we wanted to make this safe, assignments with SET GLOBAL innodb_log_optimize_ddl=... should not only issue a redo log checkpoint (including a write of all dirty pages from the entire buffer pool), but it should also wait for all pending ALTER TABLE activity to complete. We elect not to do this. Avoiding unnecessary use of the doublewrite buffer should improve the write performance of InnoDB. buf_page_t::init_on_flush: A new flag to indicate whether it is safe to skip doublewrite buffering when writing the page. fsp_init_file_page(): When writing a MLOG_INIT_FILE_PAGE2 record, set the init_on_flush flag if innodb_log_optimize_ddl=OFF. This is the only function that writes that log record. buf_flush_write_block_low(): Skip doublewrite if init_on_flush is set. fil_aio_wait(): Clear init_on_flush. |
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Code status:
travis-ci.org (10.4 branch)ci.appveyor.com
MariaDB: drop-in replacement for MySQL
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 and the MariaDB corporation. Please read the CREDITS file 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 the MariaDB Corporation, the MariaDB Foundation 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 run 'SHOW authors' to get a list of active contributors.
A description of the MariaDB project and a manual can be found at:
https://mariadb.com/kb/en/mariadb-vs-mysql-features/
https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/
https://mariadb.com/kb/en/library/new-and-old-releases/
As MariaDB is a full replacement of MySQL, the MySQL manual at http://dev.mysql.com/doc is generally applicable.
Help
More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss and the #maria IRC channel on Freenode.
Live QA for beginner contributors
MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip and IRC. From 8:00 to 10:00 UTC on Mondays, and 10:00 to 12:00 UTC on Thursdays, anyone can ask any questions they’d like, and a live developer will be available to assist.
New contributors can ask questions any time, but we will provide immediate feedback during that interval.
Licensing
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 file. Third party license information can be found in the THIRDPARTY file.
Bug Reports
Bug and/or error reports regarding MariaDB should be submitted at: https://jira.mariadb.org
For reporting security vulnerabilities see: https://mariadb.org/about/security-policy/
Bugs in the MySQL code can also be submitted at: https://bugs.mysql.com
The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server