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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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aed8369e43
Description: When querying a subset of columns from the information_schema.TABLES Analysis: When information about tables is collected for statements like "SELECT ENGINE FROM I_S.TABLES" we do not perform full-blown table opens in SE, instead we only use information from table shares from the Table Definition Cache or .FRMs. Still in order to simplify I_S implementation mock TABLE objects are created from TABLE_SHARE during this process. This is done by calling open_table_from_share() function with special arguments. Since this function always increments "Opened_tables" counter, calls to it can be mistakingly interpreted as full-blown table opens in SE. Note that claim that "'SELECT ENGINE FROM I_S.TABLES' statement doesn't use Table Cache" is nevertheless factually correct. But it misses the point, since such statements a) don't use full-blown TABLE objects and therefore don't do table opens b) still use Table Definition Cache. Fix: We are now incrementing the counter when db_stat(i.e open flags for ha_open( we have considered an optimization which would use TABLE objects from Table Cache when available instead of constructing mock TABLE objects, but found it too intrusive for stable releases. |
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| README | ||
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MySQL Server 5.5 This is a release of MySQL, a dual-license SQL database server. For the avoidance of doubt, this particular copy of the software is released under the version 2 of the GNU General Public License. MySQL is brought to you by Oracle. Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. License information can be found in the COPYING file. MySQL FOSS License Exception We want free and open source software applications under certain licenses to be able to use specified GPL-licensed MySQL client libraries despite the fact that not all such FOSS licenses are compatible with version 2 of the GNU General Public License. Therefore there are special exceptions to the terms and conditions of the GPLv2 as applied to these client libraries, which are identified and described in more detail in the FOSS License Exception at <http://www.mysql.com/about/legal/licensing/foss-exception.html>. This distribution may include materials developed by third parties. For license and attribution notices for these materials, please refer to the documentation that accompanies this distribution (see the "Licenses for Third-Party Components" appendix) or view the online documentation at <http://dev.mysql.com/doc/>. GPLv2 Disclaimer For the avoidance of doubt, except that if any license choice other than GPL or LGPL is available it will apply instead, Oracle elects to use only the General Public License version 2 (GPLv2) at this time for any software where a choice of GPL license versions is made available with the language indicating that GPLv2 or any later version may be used, or where a choice of which version of the GPL is applied is otherwise unspecified. For further information about MySQL or additional documentation, see: - The latest information about MySQL: http://www.mysql.com - The current MySQL documentation: http://dev.mysql.com/doc Some Reference Manual sections of special interest: - If you are migrating from an older version of MySQL, please read the "Upgrading from..." section. - To see what MySQL can do, take a look at the features section. - For installation instructions, see the Installing and Upgrading chapter. - For the new features/bugfix history, see the MySQL Change History appendix. You can browse the MySQL Reference Manual online or download it in any of several formats at the URL given earlier in this file. Source distributions include a local copy of the manual in the Docs directory.