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Posted by Jack Vamvas on 03/17/06 17:49
How often are queries run on these tables?
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Jack Vamvas
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<hallpa1@yahoo.com> wrote in message
news:1142607720.889826.79740@p10g2000cwp.googlegroups.com...
> Hi All,
> I am designing a purge process for a db that has grown to almost 200GB.
> My purge process will remove about 1/3 of the 500 million rows spread
> over seven tables. Currently there are about 35 indexes defined on
> those seven tables. My question is will there be a performance gain by
> dropping those indexes, doing my purge, and re-creating the indexes. I
> am afraid that leaving those indexes in place will create a lot of
> extra overhead in my delete statements by having to maintain the
> indexes. I know that it could take many hours to rebuild the indexes
> afterward, but I am planning on doing that anyway. The reason that I
> want to know whether I should drop the indexes ahead of time, is I may
> not be able to do the entire purge at once and the tables may need to
> be accessed between purges. If this occurs, I will need to have those
> indexes in place.
>
> So do I drop the indexes before the purge and re-create them later or
> do I leave them in place and re-index them afterward?
>
> Thanks In Advance
>
> p.h.
>
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