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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Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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