RE: How to optimize the query

Sunitha Hi,

Where can I find the derby.properties?

 
Thanks,
David

-----Original Message-----
From: Sunitha Kambhampati 
[mailto:skambha-ey1RL7y7pkPYtjvyW6yDsg@xxxxxxxxxxxxxxxx]
Sent: Tuesday, October 19, 2004 6:25 PM
To: Derby Development
Subject: Re: How to optimize the query



David Zonsheine wrote:

> We tried to see the index usage but couldn't.
>
did you try to set the property derby.language.logQueryPlan=true in your 
derby.properties file or you can also set it as  a java property  
-Dderby.language.logQueryPlan=true

This property when set will print the query plans  in derby.log  

If an index is used, you will be able to see  IndexScan ResultSet....

an example :
here my tablename is SCANFIXED and index is SCANFIXEDX...

[snip]
    Index Scan ResultSet for SCANFIXED using index SCANFIXEDX at read 
committed isolation level using instantaneous share row locking chosen 
by the optimizer
[snip]


Sunitha.
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