The commands from this post will work on MySQL and MariaDB server.
It’s a good idea to perform database maintenance from time to time. One thing is to do is to optimize the tables. We have two options:
1. 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.
See below how to use it.
root@web [~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 3670
Server version: 10.1.22-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> use roundcube
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
MariaDB [roundcube]> OPTIMIZE TABLE cache;
+-----------------+----------+----------+-------------------------------------------------------------------+
| Table | Op | Msg_type | Msg_text |
+-----------------+----------+----------+-------------------------------------------------------------------+
| roundcube.cache | optimize | note | Table does not support optimize, doing recreate + analyze instead |
| roundcube.cache | optimize | status | OK |
+-----------------+----------+----------+-------------------------------------------------------------------+
2 rows in set (0.04 sec)
MariaDB [roundcube]> quit
Bye
root@web [~]#
If you want to run the command for multiple tables from the same database, use:
OPTIMIZE TABLE table1,table2,table3;OPTIMIZE TABLE works with InnoDB, MyISAM, and ARCHIVE tables.
2. mysqlcheck command
The mysqlcheck client performs table maintenance: It checks, repairs, optimizes, or analyzes tables.
To check one table use: mysqlcheck db_name tbl_name
To check all tables from a database: mysqlcheck –databases db_name
To check the tables from all the databases on the server: mysqlcheck –all-databases
Notice that database tables are locked while mysqlcheck is running. No records can be inserted or deleted from the tables.
root@web [~]# mysqlcheck roundcube
roundcube.cache OK
roundcube.cache_index OK
roundcube.cache_messages OK
roundcube.cache_shared OK
roundcube.cache_thread OK
roundcube.contactgroupmembers OK
roundcube.contactgroups OK
roundcube.contacts OK
roundcube.cp_schema_version OK
roundcube.dictionary OK
roundcube.identities OK
roundcube.searches OK
roundcube.session OK
roundcube.system OK
roundcube.users OK
root@web [~]# To optimize a database, use:
root@web [~]# mysqlcheck -o roundcube
roundcube.cache
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.cache_index
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.cache_messages
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.cache_shared
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.cache_thread
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.contactgroupmembers
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.contactgroups
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.contacts
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.cp_schema_version Table is already up to date
roundcube.dictionary
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.identities
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.searches
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.session
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.system
note : Table does not support optimize, doing recreate + analyze instead
status : OK
roundcube.users
note : Table does not support optimize, doing recreate + analyze instead
status : OK
root@web [~]#To optimize all the database on the sever use:
root@web [~]# mysqlcheck -o -A
Resources:
OPTIMIZE TABLE manual
mysqlcheck manual