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Oracle analyze table

Posted on 2010-08-25
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Hey guys how can I find when had Oracle analyze table last time. And if it is not analyzed than how can I analyze a table. Thanks for your help in advance
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Question by:hussainkhan22
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by:slightwv (䄆 Netminder)
ID: 33520541
There is a LAST_ANALYZED column in DBA_TABLES (and USER_TABLES).

There is an older analyze table command but I suggest the newer DBMS_STATs package to generate them.
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sindhuxyz earned 1000 total points
ID: 33520591
ANALYZE TABLE employees COMPUTE STATISTICS;
ANALYZE INDEX employees_pk COMPUTE STATISTICS;

ANALYZE TABLE employees ESTIMATE STATISTICS SAMPLE 100 ROWS;
ANALYZE TABLE employees ESTIMATE STATISTICS SAMPLE 15 PERCENT;

Read this article for more:

http://www.oracle-base.com/articles/8i/CostBasedOptimizerAndDatabaseStatistics.php
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by:slightwv (䄆 Netminder)
slightwv (䄆 Netminder) earned 1000 total points
ID: 33520662
As I mentioned before: The analyze table method is older and discouraged by Oracle.   It's best to use DBMS_STATS.

In later releases (10g and above), STATS are typically gathered automatically in the maintenance window:

http://www.dbasupport.com/oracle/ora10g/scheduler01.shtml



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