FreeLists / oracle-l / Re:

["Carel-Jan Engel" <cjpengel.dbalert@xxxxxxxxx>]

And David should be Edgar......

Need another coffee.

Regards, Carel-Jan

===
If you think education is expensive, try ignorance. (Derek Bok)
===



> You can also create a function based index on TRUNC(last_update_date), but
> w/o any changes to your tables and/or indexes rephrasing the query to
> WHERE last_update_date BETWEEN TRUNC(SYSDATE - 1) AND  TRUNC(SYSDATE -
> 1/86400)
> will make an index-range scan possible. The 1/86400 is to subtract 1
> second of the SYSDATE, to prevent including the 0:00:00 updates of today.
>
> Regards, Carel-Jan
>
> ===
> If you think education is expensive, try ignorance. (Derek Bok)
> ===
>
>
>
>> Hello expert,
>>
>> I have a table with 40 millions records and the last update date is
>> indexed.  But when we use the
>> following where clause, it takes forever to run the report.
>>
>>    WHERE TRUNC(last_update_date) = TRUNC(SYSDATE - 1)
>>
>> How to improve the performance?  Do I need to create a new index field
>> on
>> the table with TRUNC(last_update_date)?
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