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
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