The manual page and help for the mysqlcheck linux command. The mysqlcheck client program performs table maintenance: it checks, repairs, optimizes, or analyzes tables. All tables are locked during the operation, so the tables are not available for other sessions during maintenance, although only READ is locked during audit operations. Board maintenance operations can be time consuming, especially for large boards. If the program is called with --databses or --all-databases to process all tables in one or more databases, it can take a long time to run mysqlcheck. (This is also true for the mysql_upgrade command, because this program calls mysqlcheck to check all tables and repair them if necessary.)