RE: Query Tuning Help

Mon, 27 Oct 2003 09:15:22 -0800

Title: Query Tuning Help
 
David,
 
The calculation "(> SYSDATE - 35)" is not causing the problem.  The To_Date(a2.file_dts, 'mmddyyhh24miss') is.
 
You said you created a function based index.  I think you also need to set:
 
Query_ReWrite_Integrity         = TRUSTED
Query_ReWrite_Enabled           = TRUE  
for function based indexes to work.
 
Check out the doco for function based indexes.  Good Luck!
 
Tom Mercadante
Oracle Certified Professional
-----Original Message-----
From: David Wagoner [mailto:[EMAIL PROTECTED]
Sent: Monday, October 27, 2003 10:34 AM
To: Multiple recipients of list ORACLE-L
Subject: Query Tuning Help

I'm trying to tune the following query to use an index on the FILE_DTS column, rather than a FTS on the CLASS_CONFIG table (~350,000 rows).

SELECT  a2.class_config_id, a1.schedule_name
FROM    class_config a2, class_schedule a1
WHERE a2.class_config_id = a1.class_config_id
AND       to_date(a2.file_dts, 'mmddyyhh24miss') > SYSDATE - 35


I created a function-based index on FILE_DTS, like this:

CREATE INDEX CLASS_CONFIG_FILE_DTS_FX_IDX ON CLASS_CONFIG to_date(file_dts, 'mmddyyhh24miss')

and analyzed the table, but the explain plan still shows a FTS.  I can change the query to something simpler and get it to use the new index, but I assume the calculation (> SYSDATE - 35) is causing the problem.  Any suggestions?


Best regards,

David B. Wagoner
Database Administrator
Arsenal Digital Solutions
Web: http://www.arsenaldigital.com

<<...OLE_Obj...>>


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