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Determining when to rebuild indexes

Oracle Tips by Burleson Consulting

The Data Warehouse Development Life Cycle

Oracle Features for the Data Warehouse

Determining when to rebuild indexes

So, how do we tell when an index would benefit from being rebuilt?  There are two Oracle views that provide index statistics, Remote DBA_INDEXES and INDEX_STATS.  The Remote DBA_INDEX view contains statistical information that is placed into the view when the ANALYZE INDEX xxx command is issued.  Unfortunately, the Remote DBA_INDEXES view was designed to provide information to the cost-based SQL optimizer and it does not keep statistics about the internal status of the Oracle indexes.  To see the internal structure for an Oracle index, you must use the ANALYZE INDEX xxx VALIDATE STRUCTURE  SQL command to validate the structure for the index.  This command creates a single row in a view called INDEX_STATS.


SQL> analyze index DON.DON_FK_PLT validate structure;


Index analyzed.


SQL> select * from index_stats;


    HEIGHT     BLOCKS NAME                              LF_ROWS    LF_BLKS
---------- ---------- ------------------------------ ---------- ----------
----------- ---------- ---------- ---------- ----------- ---------- -----------
--------------- ------------- ----------------- ----------- ----------
---------- ------------ --------------------
         3       5635 DON_FK_PART                       196103       2382
    3137648       3900       2381         18       41031       3956           7
            112           125             56220     9361008    3178679
        34     1568.824              787.912

The Oracle index_stats view will never contain more than one row.  Therefore, you must
perform the "analyze index xxx validate structure" command and "select * from index_stats" before issuing the next analyze index command.  The script id1.sql provides a method for getting a complete report for all indexes.

This is an excerpt from "High Performance Data Warehousing". 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:


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