ANALYZE [NO_WRITE_TO_BINLOG | LOCAL] TABLE tbl_name [,tbl_name ...] [PERSISTENT FOR [ALL|COLUMNS ([col_name [,col_name ...]])] [INDEXES ([index_name [,index_name ...]])]]
ANALYZE TABLE analyzes and stores the key distribution for a
table (index statistics). During the analysis, the table is locked with a read lock for MyISAM.
For InnoDB the table is locked with a write lock. This statement works with
MyISAM, Aria and InnoDB tables. For MyISAM tables, this statement is equivalent
to using myisamchk --analyze.
For more information on how the analysis works within InnoDB, see InnoDB Restrictions
MariaDB uses the stored key distribution to decide the order in which tables should be joined when you perform a join on something other than a constant. In addition, key distributions can be used when deciding which indexes to use for a specific table within a query.
This statement requires SELECT and INSERT privileges for the table.
By default, ANALYZE TABLE statements are written to the binary log and will be replicated. The
NO_WRITE_TO_BINLOG keyword (
LOCAL is an alias) will ensure the statement is not written to the binary log.
ANALYZE TABLE is also supported for partitioned tables. You
ALTER TABLE ... ANALYZE PARTITION to analyze one or
Currently, engine-independent statistics is collected by doing full table and full index scans, and can be quite expensive.
The syntax for ANALYZE TABLE has been extended in MariaDB 10.0.1 to allow one to collect statistics only for particular columns or indexes, using
Note that statistics for blob and text columns are not collected. If explicitly specified, a warning is returned.
-- update all engine-independent statistics for all columns and indexes ANALYZE TABLE tbl PERSISTENT FOR ALL; -- update specific columns and indexes: ANALYZE TABLE tbl PERSISTENT FOR COLUMNS (col1,col2,...) INDEXES (idx1,idx2,...); -- empty lists are allowed: ANALYZE TABLE tbl PERSISTENT FOR COLUMNS (col1,col2,...) INDEXES (); ANALYZE TABLE tbl PERSISTENT FOR COLUMNS () INDEXES (idx1,idx2,...); -- the following will only update mysql.table_stat fields: ANALYZE TABLE tbl PERSISTENT FOR COLUMNS () INDEXES (); -- with use_stat_tables != NEVER a simple ANALYZE TABLE collects engine-independent statistics for all columns and indexes. SET SESSION use_stat_tables='COMPLEMENTARY'; ANALYZE TABLE tbl;
PERSISTENT FOR is required to update the engine-independent statistics even if the table has the option