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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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Marko Mäkelä f2096478d5 MDEV-29835 InnoDB hang on B-tree split or merge 
This is a follow-up to
commit de4030e4d4 (MDEV-30400),
which fixed some hangs related to B-tree split or merge.

btr_root_block_get(): Use and update the root page guess. This is just
a minor performance optimization, not affecting correctness.

btr_validate_level(): Remove the parameter "lockout", and always
acquire an exclusive dict_index_t::lock in CHECK TABLE without QUICK.
This is needed in order to avoid latching order violation in
btr_page_get_father_node_ptr_for_validate().

btr_cur_need_opposite_intention(): Return true in case
btr_cur_compress_recommendation() would hold later during the
mini-transaction, or if a page underflow or overflow is possible.
If we return true, our caller will escalate to aqcuiring an exclusive
dict_index_t::lock, to prevent a latching order violation and deadlock
during btr_compress() or btr_page_split_and_insert().

btr_cur_t::search_leaf(), btr_cur_t::open_leaf():
Also invoke btr_cur_need_opposite_intention() on the leaf page.

btr_cur_t::open_leaf(): When escalating to exclusive index locking,
acquire exclusive latches on all pages as well.

innobase_instant_try(): Return an error code if the root page cannot
be retrieved.

In addition to the normal stress testing with Random Query Generator (RQG)
this has been tested with
./mtr --mysqld=--loose-innodb-limit-optimistic-insert-debug=2
but with the injection in btr_cur_optimistic_insert() for non-leaf pages
adjusted so that it would use the value 3. (Otherwise, infinite page
splits could occur in some mtr tests.)

Tested by: Matthias Leich
2023-03-16 15:52:42 +02:00
.github Add Pull Request template file to the MariaDB/server repository 2021-05-27 16:28:28 +03:00
BUILD Added detection of memory overwrite with multi_malloc 2023-02-27 19:25:44 +02:00
client Merge 10.5 into 10.6 2023-02-10 13:03:01 +02:00
cmake Merge branch '10.5' into 10.6 2023-01-31 09:31:42 +01:00
dbug Merge branch '10.6.12' into 10.6 2023-02-06 20:18:44 +01:00
debian Merge 10.5 into 10.6 2023-03-10 09:35:50 +02:00
Docs Merge 10.4 into 10.5 2022-09-26 13:34:38 +03:00
extra Merge 10.5 into 10.6 2023-03-16 15:48:08 +02:00
include Merge 10.5 into 10.6 2023-03-10 09:35:50 +02:00
libmariadb@12bd1d5511 CONC-637 Build fails when specifying -DPLUGIN_AUTH_GSSAPI_CLIENT=OFF 2023-02-28 20:15:56 +01:00
libmysqld Merge 10.5 into 10.6 2022-12-13 16:58:58 +02:00
libservices Add build on AIX 2020-12-16 08:07:04 +11:00
man Merge 10.5 into 10.6 2022-11-30 07:06:41 +02:00
mysql-test Merge 10.5 into 10.6 2023-03-16 15:48:08 +02:00
mysys Merge 10.5 into 10.6 2023-02-28 16:05:21 +02:00
mysys_ssl Merge 10.4 into 10.5 2023-02-10 12:02:11 +02:00
plugin Merge 10.5 into 10.6 2023-03-10 09:35:50 +02:00
randgen/conf Group commit for maria engine. 2010-02-12 15:12:28 +02:00
scripts Update 10.5 HELP tables 2023-01-24 11:28:37 +11:00
sql Merge 10.5 into 10.6 2023-03-10 09:35:50 +02:00
sql-bench MDEV-24854: Change innodb_flush_method=O_DIRECT by default 2021-02-20 11:58:58 +02:00
sql-common Merge branch '10.5' into 10.6 2022-05-10 14:01:23 +02:00
storage MDEV-29835 InnoDB hang on B-tree split or merge 2023-03-16 15:52:42 +02:00
strings Merge 10.5 into 10.6 2023-02-10 13:03:01 +02:00
support-files Merge branch 10.5 into 10.6 2022-12-15 09:32:54 +11:00
tests Merge 10.5 into 10.6 2022-10-25 14:25:42 +03:00
tpool Merge 10.5 into 10.6 2023-02-10 13:03:01 +02:00
unittest Merge 10.5 into 10.6 2022-12-05 18:04:23 +02:00
vio Merge branch '10.5' into 10.6 2022-11-02 14:33:20 +01:00
win Merge 10.5 into 10.6 2023-02-10 13:03:01 +02:00
wsrep-lib@275a0af8c5 MDEV-30419 Fix unhandled exception thrown from wsrep-lib 2023-01-19 14:55:50 +02:00
zlib zlib: remove redundant and generated files 2022-07-26 16:46:27 +02:00
.clang-format Merge 10.4 into 10.5 2019-12-27 21:17:16 +02:00
.gitattributes Merge branch '10.5' into 10.6 2022-02-03 17:01:31 +01:00
.gitignore Merge branch '10.5' into 10.6 2022-05-10 14:01:23 +02:00
.gitlab-ci.yml Fix build failure in sanitizer on GitLab-CI 2022-12-20 13:27:50 +00:00
.gitmodules Merge 10.4 into 10.5 2023-01-03 17:08:42 +02:00
appveyor.yml Merge 10.5 into 10.6 2022-07-27 17:52:37 +03:00
BUILD-CMAKE Minor spelling fixes in code comments, docs and output 2018-01-12 16:49:02 +02:00
CMakeLists.txt Merge 10.5 into 10.6 2023-01-03 18:13:11 +02:00
config.h.cmake Merge 10.5 into 10.6 2022-10-12 12:14:13 +03:00
configure.cmake Merge 10.5 into 10.6 2022-10-06 09:22:39 +03:00
CONTRIBUTING.md Remove mention of Freenode 2021-09-22 07:15:08 +02:00
COPYING Update FSF Address 2019-05-11 21:29:06 +03:00
CREDITS CREDITS: re-instate Tencent Cloud 2023-01-25 16:44:26 +11:00
INSTALL-SOURCE Update AskMonty and Atlassian references to MariaDB 2016-03-08 15:24:01 +02:00
INSTALL-WIN-SOURCE Update AskMonty and Atlassian references to MariaDB 2016-03-08 15:24:01 +02:00
KNOWN_BUGS.txt Changed some MySQL names in messages to MariaDB 2018-12-09 20:49:05 +02:00
README.md Remove mention of Freenode 2021-09-22 07:15:08 +02:00
THIRDPARTY Merge 10.1 into 10.2 2019-05-13 17:54:04 +03:00
VERSION bump the VERSION 2023-02-06 10:24:21 -05:00

README.md

Code status:

  • Appveyor CI 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.org

https://mariadb.com/kb/en/

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