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+.. include:: /Includes.rst.txt
+
+.. _feature-25341:
+
+============================================================
+Feature: #25341 - Scheduler task to optimize database tables
+============================================================
+
+See :issue:`25341`
+
+Description
+===========
+
+A scheduler task to run the `OPTIMIZE TABLE` command on selected
+database tables has been added. The `OPTIMIZE TABLE` command
+reorganizes the physical storage of table data and associated index
+data to reduce storage space and improve I/O efficiency when
+accessing the table. The exact changes made to each table depend
+on the storage engine used by that table. For more information see
+the `MySQL manual`_.
+
+The scheduler task is meant for the MySQL database system and only
+shows tables matching the MySQL storage engines MyISAM, InnoDB and
+ARCHIVE. Using this task with DBAL and other DBMS is not supported
+as the commands used are MySQL specific.
+
+
+Impact
+======
+
+Optimizing tables is I/O intensive. On MySQL < 5.6.17 it also locks
+the tables for the whole time, which can severely impact the website
+while it is running. When considering whether or not to run optimize,
+consider the workload of transactions that your server will process
+as InnoDB tables do not suffer from fragmentation in the same way
+that MyISAM tables do.
+
+.. _MySQL manual: https://dev.mysql.com/doc/refman/5.6/en/optimize-table.html
+
+
+.. index:: ext:scheduler, Database