Cant use HINT's

Question

hello all,
this is 10g on AIX(RAC). i have been trying to use a index on a query forcefully by using a HINT ..here is the query.
SELECT m.* FROM law.messages m inner join law.log_events l on l.bod_id = m.bod_id and l.type = 'LogEventException' WHERE ((m.source_date_time between
to_date('2008-10-01 14:58:00', 'yyyy/mm/dd hh24:mi:ss') and
to_date('2008-10-02 14:58:00', 'yyyy/mm/dd hh24:mi:ss')) and m.bod_id!='unknown') ORDER BY m.source_date_time desc;
and my question it still not using an index i want it to use. the index name is IDX_MSG_SOURCE_DATE_TIME .....its on message table...wat am i doing wrong here?? this is wat i using the hint as...
SELECT /*+ index (message idx_msg_source_date_time)*/ m.* FROM law.messages m inner join law.log_events l on l.bod_id = m.bod_id and l.type = 'LogEventException' WHERE ((m.source_date_time between
to_date('2008-10-01 14:58:00', 'yyyy/mm/dd hh24:mi:ss') and
to_date('2008-10-02 14:58:00', 'yyyy/mm/dd hh24:mi:ss')) and m.bod_id!='unknown') ORDER BY m.source_date_time desc;
i look at the explain plan and everything...it dosent use the index i want it to use..so wat am i doing wrong?? i did drop and re-created the index...gatherd stats for the index...tables and whole schema as well...still no results...
the query dose pick up the index or shall i say use a index on log_Event table ....but dont use index on message table...which is making this query run forever...
Edited by: user630084 on Oct 14, 2008 10:33 AM
Edited by: user630084 on Oct 14, 2008 10:36 AM

Answer 1

Hi,
check the EP of below sql. it should use the index.
SELECT /*+ index (m idx_msg_source_date_time)*/ m.* FROM law.messages m inner join law.log_events l on l.bod_id = m.bod_id and l.type = 'LogEventException' WHERE ((m.source_date_time between
to_date('2008-10-01 14:58:00', 'yyyy/mm/dd hh24:mi:ss') and
to_date('2008-10-02 14:58:00', 'yyyy/mm/dd hh24:mi:ss')) and m.bod_id!='unknown') ORDER BY m.source_date_time desc;
Thanks,
krishna B