RE: automatic extent allocation

From: Roger Xu <roger_xu_at_dp7uptx.com>
Date: Fri, 7 Jan 2005 14:53:13 -0600
Message-ID: <A6801E8A03316A4DA597866F77A013F7059C91E6@irv2kexch01>

So the suggestion would be to move it to its own tablespace with uniform extent allocation? What is Oracle 9i's limit as far as the number of extents in a table? Thanks.
-----Original Message-----

From: Jonathan Lewis [ mailto:jonathan_at_jlcomp.demon.co.uk] Sent: Friday, January 07, 2005 2:33 AM
To: Roger Xu; Oracle-L_at_Freelists. Org (E-mail) Subject: Re: automatic extent allocation

In the first place, I would consider moving the object out of the current tablespace (or move everything else out of the tablespace) because it sounds like nothing else should be sharing that tablespace. (Consider the problem of recovering the entire tablespace because one of the other tables gets a corrupt block - if you can't take advantage of rman block level recovery).

Secondly, at 3GB per month, I would consider partitioning the table at something like one partition per month - thus making your question moot.

It sounds like your object is still using 64MB extents - it would be interesting to see if there is another step size when you hit a total of 64GB, or whether you keep going at 50 extents per month.

I suspect the problems you __might__ get from having 2,000 extents are much less significant than the problems you __might__ get if you have a 100GB segment by the end of next year.

Regards

Jonathan Lewis

http://www.jlcomp.demon.co.uk/faq/ind_faq.html The Co-operative Oracle Users' FAQ

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Original Message ----- From: "Roger Xu" <roger_xu_at_dp7uptx.com> To: "Oracle-L_at_Freelists. Org (E-mail)" <oracle-l_at_freelists.org> Sent: Thursday, January 06, 2005 11:54 PM Subject: automatic extent allocation

Hi list,

We are on Solaris 9/Oracle 9i with locally managed tablespace. There is a huge tablespace in our database with many huge tables. The biggest table has a size of 60 GB. (Indexes are in a different tablespace)
And it has 1030 extents now, because we use automatic extent allocation.

Right now we do not have any issues. Do you recommend me to move it to its own tablespace with uniform extent allocation? At what point are we going to have issue? over 2000 extents? The table is growing at a rate of 3 GB / month.

TIA, Roger
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