Why the optimizer is not choosing the best plan?
- From: Sami Seerangan <dba.orcl@xxxxxxxxx>
- To: Oracle Discussion List <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 20 Oct 2004 15:49:01 -0400
Hi All,
I have 4 tables join query(all tables statistics are upto date) that
is working fine if it goes for HASH_JOIN. But without HINT it is
always doing NL_JOIN and takes about 50 secs to execute.
However using ORDERED hint it is going for HASH_JOIN and the response
time got reduced to less than 5 secs, but we don't prefer to implement
HINT based solution
Why the optimizer is not choosing the best execution plan(In this case
hash_join rather than NL_join)?
--
Sami Seerangan
Oracle DBA
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