Query performance : TOAD Vs SQL Plus, and caching of query output
Hi,
I have one query which takes more than 2 minutes in TOAD, but the same one takes less than 30 secs when executed in SQL Plus. Can some body please tell me why the performance is so different in the two. Is this a known issue? Can i get the actual time required for a query?
Also when I execute the same query in TOAD for the second time in succession, the execution time reduces drastically from 2 mins to 10 secs. Does caching occur in TOAD? Can I disable it. I am using TOAD for Oracle, Version 9.0.0.160.
Thanks,
Rahul.
user641207 wrote:
Hi,
I have one query which takes more than 2 minutes in TOAD, but the same one takes less than 30 secs when executed in SQL Plus. Can some body please tell me why the performance is so different in the two. Is this a known issue? Can i get the actual time required for a query?
Also when I execute the same query in TOAD for the second time in succession, the execution time reduces drastically from 2 mins to 10 secs. Does caching occur in TOAD? Can I disable it. I am using TOAD for Oracle, Version 9.0.0.160.Rahul,
it's unlikely but possible that the session established via TOAD has different settings than the session established via SQL*Plus.
You can check V$SQL and V$SQL_SHARED_CURSOR to find out if the SQL you're executing has different plans, which would result in multiple rows in V$SQL for the same SQL_ID (10g) or ADDRESS, HASH_VALUE (pre-10g) with different CHILD_NUMBERs and V$SQL_SHARED_CURSOR can tell you why they can't share the plan, in case you've got multiple plans.
In addition you can use V$SES_OPTIMIZER_ENV to find out if the optimizer related settings differ for the TOAD and SQL*Plus session.
The caching effect is probably the caching of the database rather than anything else. I don't think that TOAD caches the result on the client side.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/
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