RE: Query Tuning Help

Mladen,

Thanks for your response. Comments are in-line.

>>Do you have "query rewrite" privilege? Yes.

>>What is the query_reqrite_inegrity set to? TRUSTED. >>How about optimizer parameters
(optimizer_index_caching,optimizer_index_cost_adj)? optimizer_index_caching=0 <<Are these reasonable values? optimizer_index_cost_adj=100

>>Is everything analyzed?
Yes, I used ANALYZE TABLE CLASS_CONFIG COMPUTE STATISTICS FOR ALL COLUMNS FOR ALL INDEXES after creating the function-based index.

Best regards,

David B. Wagoner
Database Administrator
Arsenal Digital Solutions
Web: http://www.arsenaldigital.com

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Thank you.

-----Original Message-----
Sent: Monday, October 27, 2003 11:10 AM
To: Multiple recipients of list ORACLE-L

Do you have "query rewrite" privilege? What is the query_reqrite_inegrity set to? How about optimizer parameters (optimizer_index_caching,optimizer_index_cost_adj)? Is everything analyzed?
On 10/27/2003 10:34:26 AM, David Wagoner wrote:
> I'm trying to tune the following query to use an index on the
> FILE_DTS
> column, rather than a FTS on the CLASS_CONFIG table (~350,000 rows).
>
> SELECT a2.class_config_id, a1.schedule_name
> FROM class_config a2, class_schedule a1
> WHERE a2.class_config_id = a1.class_config_id
> AND to_date(a2.file_dts, 'mmddyyhh24miss') > SYSDATE - 35
>
>
> I created a function-based index on FILE_DTS, like this:
>
> CREATE INDEX CLASS_CONFIG_FILE_DTS_FX_IDX ON CLASS_CONFIG
> to_date(file_dts,
> 'mmddyyhh24miss')
>
> and analyzed the table, but the explain plan still shows a FTS. I
> can
> change the query to something simpler and get it to use the new
> index,
> but I
> assume the calculation (> SYSDATE - 35) is causing the problem. Any
> suggestions?
>
>
> Best regards,
>
> David B. Wagoner
> Database Administrator
> Arsenal Digital Solutions
> Web: http://www.arsenaldigital.com
>
> <<...OLE_Obj...>>
>
>
> The contents of this e-mail message may be privileged and/or
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> If you are not the intended recipient, any review, dissemination,
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> distribution or other use of the contents of this message or any
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> error,
> please notify us immediately by return e-mail or by telephone
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> Thank you.
>

>

Mladen Gogala
Oracle DBA

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