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analyze table
ANALYZE.
ANALYZE generate table and index statistics. ANALYZE INDEX TABLE name; ANALYZE ALL TABLES IN SCHEMA schema LIKE pattern; Description. Index statistics are used by the optimizer to improve query performance allowing the optimizer to choose the most efficient index access method.
MySQL: MySQL 5.0 Reference Manual: 13.5.2.1 Syntaxe de ANALYZE TABLE.
See Section 13.5.3.6, Syntaxe de SHOW DATABASES. Si la table n'a' pas changé depuis la dernière commande ANALYZE TABLE, elle ne sera pas analysée à nouveau. This is a translation of the MySQL Reference Manual that can be found at dev.mysql.com.
Analyze command Splice Machine Documentation.
splice analyze table test.t2; schemaName tableName partition rowsCollecpartitionSize partitionCount statsType sampleFraction TEST T2 All 39226 235356 1 2 0 1 rows selected splicesplice analyze table test.t2 estimate statistics sample 50 percent; schemaName tableName partition rowsCollecpartitionSize partitionCount statsType sampleFraction TEST T2 All 19613 235356 1 3 0.5 1 rows selected splicesplice analyze schema test; schemaName tableName partition rowsCollecpartitionSize partitionCount statsType sampleFraction TEST T2 All 39226 235356 1 2 0 TEST T5 All 39226 235356 1 2 0 2 rows selected splice.
ANALYZE.
Documentation PostgreSQL 8.2.23 Référence Commandes SQL ANALYZE. ANALYZE Collecter les statistiques d'une' base de données. ANALYZE VERBOSE table colonne., ANALYZE collecte des statistiques sur le contenu des tables de la base de données et stocke les résultats dans la table système pg_statistic.
ANALYZE Pivotal Greenplum Docs.
For a partitioned table that contains a leaf child partition that has been exchanged to use an external table, ANALYZE does not collect statistics for the external table partition.: If ANALYZE ROOTPARTITION is run, external table partitions are not sampled and root table statistics do not include external table partition.
MySQL 5 ANALYZE TABLE Editions ENI Extrait gratuit.
En pratique, il nest guère utile dexécuter cette commande régulièrement, sauf si vous avez fréquemment dimportants changements dans votre table, car pour MyISAM, les statistiques sont tenus à jour à chaque INSERT ou DELETE et InnoDB se base lui sur des estimations. mysql ANALYZE TABLE employees; Table Op Msg_type Msg_text maintenance.employees analyze status OK.
Analyzing Tables, Indexes, and Clusters.
After a CHAINED_ROWS table is created, you specify it in the INTO clause of the ANALYZE statement. For example, the following statement inserts rows containing information about the chained rows in the emp_dept cluster into the CHAINED_ROWS table.: ANALYZE CLUSTER emp_dept LIST CHAINED ROWS INTO CHAINED_ROWS.;
ANALYZE TABLE Oracle Database Administration: The Essential Refe Book. facebook-logo. linkedin-logo. youtube-logo. email-logo.
An example of the ANALYZE TABLE command is shown here.: ANALYZE TABLE scott.emp COMPUTE STATISTICS FOR TABLE.; When you analyze a table, Oracle populates the following columns in the DBA_TABLES, ALL_TABLES, and USER_TABLES data dictionary views.: The number of rows in the table.
indexing MySQL: random effect on ANALYZE TABLE Stack Overflow.
Chen Xie Jan 31 13 at 1655.: Stats are updated after ANALYZE TABLE, or SHOW TABLE STATUS, or query against INFORMATION_SCHEMA.TABLES. So you could one of those statements every 1 hour or every 10 minutes or whatever schedule you want.

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