Consistent gets are reduced by 50% but the query is still taking the same t

Hi ,
I am tuning a query in DWH env using a WITH clause .Doing that my consistent gets are reduced by 50% but the elapsed time in increased.
In that one 40000 rows are coming from WITH clause and joined with a table having 250000000 rows joined through Hash join.
can anybody help me out in this issue.
Thanx
Nitin

NitinMishra wrote:
Hi ,
I am tuning a query in DWH env using a WITH clause .Doing that my consistent gets are reduced by 50% but the elapsed time in increased.Unusual! Normally time goes, down when system resources do - but not always as you are seeing :(. Last time I saw something like this the reads had gone down but the CPU usage had gone up. You can get CPU usage from V$SQL.
Can you post the query, the execution plan, and statistics - both before and after the tuning?

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Consistent gets are reduced by 50% but the query taking more elapsed time.

Hi All,
While tuning a application my consistent gets are reduced by 50% but the query is still taking the same time.
In a Warehouse env data is coming from With clause that is having some 40000 rows .Then these 40K rows are joined to a table that is having 2 Billion records having indexes on primary key and date column(bitmap)indexes .
It is using Hash Joining method.

Try forcing a hash join, if possible:
http://dba-oracle.com/tips_oracle_hash_joins.htm
Can you post the plans?
http://www.dba-oracle.com/plsql/t_plsql_plans.htm

Consistent gets are reduced but elapsed time is increased.

Hi All,
While tuning a application my consistent gets are reduced by 50% but the query is still taking the same time.
In a Warehouse env data is coming from With clause that is having some 40000 rows .Then these 40K rows are joined to a table that is having 2 Billion records having indexes on primary key and date column(bitmap)indexes .

This forum is for issues with the SQL Developer tool. You'd get more response in the General Database forum.
Have fun,
K.

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Consistent gets are reduced by 50% but the query is still taking the same t

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