Kommandoerne fra dette indlæg fungerer på MySQL- og MariaDB-serveren.
Det er en god idé at udføre databasevedligeholdelse fra tid til anden. En ting er at gøre er at optimere tabellerne. Vi har to muligheder:
1. OPTIMER TABEL kommando
Omorganiserer den fysiske lagring af tabeldata og tilknyttede indeksdata for at reducere lagerplads og forbedre I/O-effektiviteten ved adgang til tabellen. De nøjagtige ændringer, der foretages i hver tabel, afhænger af den lagermaskine, der bruges af den tabel.
Se nedenfor, hvordan du bruger det.
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 [~]#
Hvis du vil køre kommandoen for flere tabeller fra den samme database, skal du bruge:
OPTIMIZE TABLE table1,table2,table3;OPTIMIZE TABLE fungerer med InnoDB-, MyISAM- og ARCHIVE-tabeller.
2. mysqlcheck kommando
Mysqlcheck-klienten udfører tabelvedligeholdelse:Den kontrollerer, reparerer, optimerer eller analyserer tabeller.
For at kontrollere en tabel, brug:mysqlcheck db_name tbl_name
For at kontrollere alle tabeller fra en database:mysqlcheck –databases db_name
For at kontrollere tabellerne fra alle databaserne på serveren:mysqlcheck –alle-databaser
Bemærk, at databasetabeller er låste mens mysqlcheck kører. Ingen poster kan indsættes eller slettes fra tabellerne.
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 [~]# For at optimere en database skal du bruge:
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 [~]#For at optimere hele databasen på serveren skal du bruge:
root@web [~]# mysqlcheck -o -A
Ressourcer:
OPTIMER TABEL manual
mysqlcheck manual