RE: Old Chestnut: Tablespace Fragmentation

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Have A Nice Day

Gerald T. Bray
Email Administrator
Handex Environmental, Inc.
(352) 735-1800 Ext 145
E-Mail: gbray_at_handexmail.com

-----Original Message-----
Sent: Wednesday, February 27, 2002 7:43 AM To: Multiple recipients of list ORACLE-L

I know this one has been done to death: use uniform extents to avoid fragmentation; multiple extents don't hurt (within limits).

But what if:

Data Warehouse, one big table on a single disk, full table (batch) scan, no concurrent transactions on the database (so no contention for the disk), no fragmentation at the file system level, initially empty buffer cache
(startup), read-only operation so DBWR isn't doing anything on this
disk. Basically I want to read one data file from end to end. Surely it would make sense to have the disk read moving smoothly from one end of the disk to the other rather than bouncing about all over the place as it may do with multiple extents "randomly" allocated.

Any thoughts?

Thanks
- Bill.

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Author: Bill Buchan
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