Qs. Will COST Based Optimizer (CBO) or Rule Based Optimizer (RBO) be
used for the PARTITIONED Table in the Following Query ?
NOTE OPTIMIZER_MODE is Set Explicitly to RULE , Run the Following SQL :-
SELECT <Some Columns>
FROM <Partition Table> , <NON-Partitioned Table>
where <Partition Table>.Column = <NON-Partitioned Table>.Column
Assuming <Partition Table>.Column is the PARTITION KEY
& BOTH <Partition Table> & <NON-Partitioned Table> are ANALYZED .
Qs. Will Only the Respective partition be SCANNED in the Above Query ?
Qs. Would there be Any Disadvantage in SETTING OPTIMIZER_MODE=RULE for
the Above Query ?
Most of the Tables in the Application may be NON-partitioned & Most of
the Queries RUN Well in RULE .
Qs. How is it Best Possible to KEEP the SAME (BEST) Execution Plan at
Various Sites where the SAME PRODUCT Exists
NOTE - These Sites Belong to DIFFERENT Customers & Have Different Total
Data Size & Distributions .
Current Data Size ranges from 50 to 150 GB but the Data is Growing Very
Rapidly & may touch 200 GB within the Year .
Being a Banking Application Product , it is a MIX of OLTP & DSS Types
of Transactions .
With OPTIMIZER_MODE set to RULE the Queries work Quite Well .
Qs. Is there any PACKAGE etc. which Automatically Causes Statistics to
be ANALYZED in some SMALL proportions (Bit by Bit) while Live Operations
are in progress ? What would be the Overhead of Such a Package (if
Exists) ?
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: VIVEK_SHARMA
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
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