Re: Cache on sysdate? --From 9i performance planning manual

Hi,

It would account for 100% of a database's workload or it could account for 0.000001% of it. Or maybe 42%, which is another good number.

This is of course nonsense taken as a statement by itself. Check out Connor McDonald's article on Dual (and probably many others have written about it, too) on www.OracleDBA.co.uk for alternatives (Jonathan Lewis has done studies on this, too).

No, it has nothing to do with iAS or such. It simply means to minimize the number of times you get the information and thereby reduce workload on any system.

The road to scaling applications goes through the simple principle of doing as little work as possible :-).

Best regards,

Mogens

chao_ping wrote:

>Hi, list friends:
> I am reading oracle 9.2 performance planning manual, and see it says:
>
> Today's date. SELECT SYSDATE FROM DUAL can account for over 60% of the
>workload on a database.
> {page 33 of that manual}
> How to understand that words? And does it mean to get the sysdate from application server rather than the db server? How to do it in the sql statement? anyone have examples?
>
>
>
>
>Regards
>zhu chao
>msn:chao_ping_at_163.com
>www.happyit.net
>www.cnoug.org(ChinaOracle User Group)
>
>
>
>

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