f074223ae7
The linear read-ahead (enabled by nonzero innodb_read_ahead_threshold) works best if index leaf pages or undo log pages have been allocated on adjacent page numbers. The read-ahead is assumed not to be helpful in other types of page accesses, such as non-leaf index pages. buf_page_get_low(): Do not invoke buf_page_t::set_accessed(), buf_page_make_young_if_needed(), or buf_read_ahead_linear(). We will invoke them in those callers of buf_page_get_gen() or buf_page_get() where it makes sense: the access is not one-time-on-startup and the page and not going to be freed soon. btr_copy_blob_prefix(), btr_pcur_move_to_next_page(), trx_undo_get_prev_rec_from_prev_page(), trx_undo_get_first_rec(), btr_cur_t::search_leaf(), btr_cur_t::open_leaf(): Invoke buf_read_ahead_linear(). We will not invoke linear read-ahead in functions that would essentially allocate or free pages, because pages that are freshly allocated are expected to be initialized by buf_page_create() and not read from the data file. Likewise, freeing pages should not involve accessing any sibling pages, except for freeing singly-linked lists of BLOB pages. We will not invoke read-ahead in btr_cur_t::pessimistic_search_leaf() or in a pessimistic operation of btr_cur_t::open_leaf(), because it is assumed that pessimistic operations should be preceded by optimistic operations, which should already have invoked read-ahead. buf_page_make_young_if_needed(): Invoke also buf_page_t::set_accessed() and return the result. btr_cur_nonleaf_make_young(): Like buf_page_make_young_if_needed(), but do not invoke buf_page_t::set_accessed(). Reviewed by: Vladislav Lesin Tested by: Matthias Leich |
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| client | ||
| cmake | ||
| dbug | ||
| debian | ||
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| extra | ||
| include | ||
| libmariadb@458a4396b4 | ||
| libmysqld | ||
| libservices | ||
| man | ||
| mysql-test | ||
| mysys | ||
| mysys_ssl | ||
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| randgen/conf | ||
| scripts | ||
| sql | ||
| sql-bench | ||
| sql-common | ||
| storage | ||
| strings | ||
| support-files | ||
| tests | ||
| tpool | ||
| unittest | ||
| vio | ||
| win | ||
| wsrep-lib@07af42c052 | ||
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| appveyor.yml | ||
| BUILD-CMAKE | ||
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| configure.cmake | ||
| CONTRIBUTING.md | ||
| COPYING | ||
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| INSTALL-WIN-SOURCE | ||
| KNOWN_BUGS.txt | ||
| README.md | ||
| THIRDPARTY | ||
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Code status:
ci.appveyor.com
MariaDB: The open source relational database
MariaDB was 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/new-and-old-releases/
Help
More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss, MariaDB's Zulip instance, https://mariadb.zulipchat.com/
Live QA for beginner contributors
MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip. 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/
The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server