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Oracle 8 Tips  

by Burleson Consulting

The Data Warehouse Development Life Cycle

Oracle Features for the Data Warehouse

Understanding Oracle indexes

One of the primary responsibilities of the Oracle Remote DBA is ensuring that Oracle indexes are present when they are needed to avoid full-table scans. In order to achieve this goal, the Oracle Remote DBA needs to understand the types of indexes that Oracle provides as well as the proper time to create a table index.

Unfortunately, the Oracle dictionary does not gather statistics about how many times an index is used, so the Remote DBA must rely upon the application developers to provide guidance regarding index placement. As Oracle moves toward Oracle 8, this reliance on the application developers may change since most of the SQL will be stored within the Oracle dictionary where the Remote DBA can analyze the explain plan output. However, until that time, the best that an Oracle Remote DBA can hope for is to keep the existing indexes clean and functioning optimally.


This is an excerpt from "High Performance Data Warehousing", copyright 1997. To learn more about Oracle, try "Oracle Tuning: The Definitive Reference", by Donald K. Burleson.  You can buy it direct from the publisher at 30% off here:
http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm

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