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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 2f342c4507 MDEV-13498 DELETE with CASCADE constraints takes long time / MDEV-13246 
MDEV-13498 is a performance regression that was introduced in MariaDB 10.2.2
by commit fec844aca8
which introduced some Galera-specific conditions that were being
evaluated even if the write-set replication was not enabled.

MDEV-13246 Stale rows despite ON DELETE CASCADE constraint
is a correctness regression that was introduced by the same commit.

Especially the subcondition
	!(parent && que_node_get_type(parent) == QUE_NODE_UPDATE)
which is equivalent to
	!parent || que_node_get_type(parent) != QUE_NODE_UPDATE
makes little sense. If parent==NULL, the evaluation would proceed to the
std::find() expression, which would dereference parent. Because no SIGSEGV
was observed related to this, we can conclude that parent!=NULL always
holds. But then, the condition would be equivalent to
	que_node_get_type(parent) != QUE_NODE_UPDATE
which would not make sense either, because the std::find() expression
is actually assuming the opposite when casting parent to upd_node_t*.

It looks like this condition never worked properly, or that
it was never properly tested, or both.

wsrep_must_process_fk(): Helper function to check if FOREIGN KEY
constraints need to be processed. Only evaluate the costly std::find()
expression when write-set replication is enabled.

Also, rely on operator<<(std::ostream&, const id_name_t&) and
operator<<(std::ostream&, const table_name_t&) for pretty-printing
index and table names.

row_upd_sec_index_entry(): Add !wsrep_thd_is_BF() to the condition.
This is applying part of "Galera MW-369 FK fixes"
f37b79c6da
that is described by the following part of the commit comment:
    additionally: skipping wsrep_row_upd_check_foreign_constraint if thd has
    BF, essentially is applier or replaying
    This FK check would be needed only for populating parent row FK keys
    in write set, so no use for appliers
2017-08-15 10:51:43 +03:00
BUILD Clean up BUILD script 2017-07-01 14:26:42 +03:00
client Merge branch '10.1' into 10.2 2017-07-08 09:56:28 +02:00
cmake cmake: update submodules automatically during the build 2017-08-14 19:45:58 +02:00
dbug Merge branch '10.1' into 10.2 2017-03-30 12:48:42 +02:00
debian MDEV-13370 Ambiguous behaviour regarding installation of header files 2017-08-14 19:45:58 +02:00
Docs
extra MDEV-13416 mariabackup --backup fails to copy log if LSN is above 4294967295 2017-08-11 16:42:27 +03:00
include MDEV-13370 Ambiguous behaviour regarding installation of header files 2017-08-14 19:45:58 +02:00
libmariadb@11321f16bf MDEV-13370 Ambiguous behaviour regarding installation of header files 2017-08-14 19:45:58 +02:00
libmysqld MDEV-13370 Ambiguous behaviour regarding installation of header files 2017-08-14 19:45:58 +02:00
libservices MDEV-11663 Create services for functionality used by plugins 2017-04-27 19:12:38 +02:00
man Merge branch '10.1' into 10.2 2017-05-09 13:24:52 +02:00
mysql-test MDEV-13498 DELETE with CASCADE constraints takes long time / MDEV-13246 2017-08-15 10:51:43 +03:00
mysys Merge branch '10.1' into 10.2 2017-07-05 19:08:55 +02:00
mysys_ssl fix compilation with OpenSSL 1.1 2017-07-13 09:14:17 +02:00
pcre MDEV-13370 Ambiguous behaviour regarding installation of header files 2017-08-14 19:45:58 +02:00
plugin MDEV-13514 fix compilation for aws_key_management plugin 2017-08-14 17:22:18 +00:00
randgen/conf
scripts MDEV-13037: wsrep_sst_mysqldump checking wrong version of mysql client 2017-08-09 12:47:12 +03:00
sql enable innodb tests for virtual indexed columns (sic!) 2017-08-14 19:45:59 +02:00
sql-bench don't install same files twice 2017-08-14 19:45:58 +02:00
sql-common Merge 10.1 into 10.2 2017-05-23 11:09:47 +03:00
storage MDEV-13498 DELETE with CASCADE constraints takes long time / MDEV-13246 2017-08-15 10:51:43 +03:00
strings MDEV-12604 Comparison of JSON_EXTRACT result differs with Mysql. 2017-08-08 10:35:26 +04:00
support-files Don't create tags for .xz files 2017-06-30 22:31:37 +03:00
tests MDEV-12579: Incorrect arguments to mysqld_stmt_execute when using LOBs 2017-06-22 15:28:57 +02:00
unittest Simplify IO_CACHE by removing current_pos and end_pos as self-references 2017-06-28 15:23:36 +03:00
vio MDEV-10332 support for OpenSSL 1.1 and LibreSSL 2017-05-09 18:53:10 +02:00
win Merge branch '10.1' into 10.2 2017-07-05 19:08:55 +02:00
wsrep Merge branch '10.1' into 10.2 2017-03-30 12:48:42 +02:00
zlib
.gitattributes
.gitignore update .gitignore 2017-07-17 22:24:24 +04:00
.gitmodules
.travis.compiler.sh travis: add clang-5.0 2017-08-07 10:05:01 +04:00
.travis.yml travis: add clang-5.0 2017-08-07 10:05:01 +04:00
BUILD-CMAKE
CMakeLists.txt don't install same files twice 2017-08-14 19:45:58 +02:00
config.h.cmake Merge 10.1 into 10.2 2017-05-23 11:09:47 +03:00
configure.cmake Merge branch '10.1' into 10.2 2016-12-29 13:23:18 +01:00
COPYING
COPYING.thirdparty Correct FSF address 2017-03-10 18:21:29 +01:00
CREDITS Update MariaDB Foundation sponsors 2017-06-15 14:42:41 +04:00
EXCEPTIONS-CLIENT
INSTALL-SOURCE
INSTALL-WIN-SOURCE
KNOWN_BUGS.txt
README.md
VERSION bump the VERSION 2017-07-12 09:42:21 -04:00

README.md

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. 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 Foundation and the MariaDB Corporation, 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: 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.

Help:

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

License:

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.

Bug Reports:

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

Code status:

  • tests status travis-ci.org (10.2 branch)