RE: Automanagement of extent sizing

From: Post, Ethan <epost_at_kcc.com>
Date: Thu, 13 Sep 2001 15:04:02 -0700
Message-ID: <F001.0038DE88.20010913150529@fatcity.com>

!! Please do not post Off Topic to this List !!

You got the idea. I am migrating a coupld DB's to LMT's now. They contain longs so I am using exp/imp instead of move table. My recommend is you create basic tablespaces at standard size 64K or 128K is normal. Export owner. Change default tablespaces and quotas for owner to new tablespace. Drop old tablespace. Import fromuser touser no indexes. Create indexfile, remove REMS, change table tablespace to index tablespace and run. This is fits my needs. Next step is to set up a .sql script that emails you when an object is over 800 or so extents. In that case get ready to move the table to the next larger sized tablespace. Pretty easy to manage once it is all implemented. - E

>-----Original Message-----
>From: DENNIS WILLIAMS [mailto:DWILLIAMS_at_LIFETOUCH.COM]
>Sent: Thursday, September 13, 2001 2:22 PM
>To: Multiple recipients of list ORACLE-L
>Subject: RE: Automanagement of extent sizing
>
>
>!! Please do not post Off Topic to this List !!
>
>Cherie - We have been using the autoextend feature for 6
>months now and have
>been really pleased with it. I am now studying the Oracle
>White Papers on
>the locally managed and uniform extent philosophy and
>beginning to follow
>that scheme. I would recommend studying it carefully. We have
>had a couple
>of runaways that ate up a lot of disk, that is the most
>obvious downside.
>The upside is obvious in the title of the Oracle white paper "Stop
>Defragging and Start Living". Here are my procedures so far:
>
>1. Use Oracle's new uniform extent recommendations to
>eliminate free extent
>fragmentation. Since all extents are the same size, no
>fragmentation can
>occur.
>2. Use locally-managed tablespaces per Oracle's recommendation.
>3. Set all extents in a tablespace to the same size. There are
>no unusable
>small free extents, free space is usable by any segment, and
>administration
>is minimized.
>4. Use only 3 extent sizes: 128K, 4M, and 128M
>5. All segments should have less than 1,024 extents. When a
>table approaches
>1,024 extents, it should be moved to the next larger extent
>size tablespace.
>6. Monitor archive log space.
>7. Temporary and rollback tablespaces should be divided into
>1,024 extents
>for optimal performance.
>8. Export the table before moving it.
>9. Use the Oracle "alter table XXX move" command.
>10. Use the Oracle "alter index XXX rebuild" command.
>
>Let me know if you have any more questions, and please share
>your ideas.
>
>Dennis Williams
>DBA
>Lifetouch, Inc.
>dwilliams_at_lifetouch.com
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>--
>Author: DENNIS WILLIAMS
> INET: DWILLIAMS_at_LIFETOUCH.COM
>
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Author: Post, Ethan
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Received on Thu Sep 13 2001 - 17:04:02 CDT