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тАО05-28-2002 06:51 PM
тАО05-28-2002 06:51 PM
Considing performance, should I rebulid index and execute DBMS_UTILITY.ANALYZE_SCHEMA periodically?
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тАО05-28-2002 08:30 PM
тАО05-28-2002 08:30 PM
Re: Considing performance, should I rebulid index and execute DBMS_UTILITY.ANALYZE_SCHEMA periodically?
Rebuilding indexes is required for volatile objects, and for objects that are right sided (that is new records added to the right hand side of an index such as indexes based on Oracle Sequences that do not cycle).
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тАО05-28-2002 09:50 PM
тАО05-28-2002 09:50 PM
Re: Considing performance, should I rebulid index and execute DBMS_UTILITY.ANALYZE_SCHEMA periodically?
you can analyze only indexes after their rebuild by running
analyze index
or analyze index
If the indexes are big >400 MB you can improve the analyze performance by setting sort area size before running analyze command.
alter session set sort_area_size=100000000;
AR
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тАО05-30-2002 01:35 AM
тАО05-30-2002 01:35 AM
Re: Considing performance, should I rebulid index and execute DBMS_UTILITY.ANALYZE_SCHEMA periodically?
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тАО05-30-2002 05:20 AM
тАО05-30-2002 05:20 AM
Re: Considing performance, should I rebulid index and execute DBMS_UTILITY.ANALYZE_SCHEMA periodically?
It permits reorganization of the tablespace, recovery of unused space, shortens full index scans and helps avoid dynamic extent allocation.
When you do, rebuild all indexes of a given tablespace.
If you are using CBO, Oracle recommends rebuilding statistics periodically. They also recommmend estimating statistics using 10% sample (but they have a disclaimer on that).
As Simeon said, a well tuned application using rule will beat out an untuned app using CBO.