Hi Anne,
what's the reason to use in the WHERE clause
the following condition:
d.document_number = m.document_number
I didn't notice 'm' in SELECT part of the query
and in FROM clause among other conditions.
> select /*+ INDEX(b)*/ distinct d.batch_number
> , d.document_number
> , d.entry_user_id
> , d.document_type_id
> , d.document_processed_date
> , b.batch_media_id, d.return_Method_Id
> from submitter_batch b , document d
> , ucc_master_amendment m
> where d.batch_number = b.batch_number
> and d.document_number = m.document_number
> and d.imaged = 0
> and b.batch_media_id = 4
> and d.document_status_id = 4
Yes, expected rows means 'cardinality'. These values
are not always exact numbers. They are CBO's estimates only.
Check if you have an index on b.batch_media_id
How many distinct values does this column have?
If the column has good selectivity you may want to have a B*Tree for it
If your table is not being updated very often and the column has low
selectivity you can consider to use Bitmap index.
BTW 4people who like puzzles.
I've described a case when CBO makes a mistake.
http://www.oradba.com.ru/tuning/optimizer/articles/a1_cbomistake.shtml
The page was written in Russian however it has enough information (excerpts from
SQL*Plus output) to track my logic.
Regards,
Ed
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