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delete_dynamic() was called 9-11x per OLTP RO query + 3x per BEGIN/COMMIT. 3 calls were performed by LEX_MASTER_INFO. Added condition to call those only for CHANGE MASTER. 1 call was performed by lock_table_names()/Hash_set/my_hash_free(). Hash_set was supposed to be used for DDL and LOCK TABLES to gather database names, while it was initialized/freed for DML too. In fact Hash_set didn't do any useful job here. Hash_set was removed and MDL requests are now added directly to the list. The rest 5-7 calls are done by optimizer, mostly by Explain_query and friends. Since dynamic arrays are used in most cases, they can hardly be optimized. my_hash_free() overhead dropped 0.02 -> out of radar. delete_dynamic() overhead dropped 0.12 -> 0.04.
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 ***************************************************************************