RE: Operations that perform multiblock I/O and cluster factor
- From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
- To: <Christian.Antognini@xxxxxxxxxxxx>, "Josh Collier" <Josh.Collier@xxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 11 Dec 2007 09:58:26 -0700
Thanks Chris, very helpful as usual! I suspected that if there was any
truth to this, it would be related to the mysterious new prefetching
feature (introduced in 9.2 I believe, but still not documented). Any
chance you could share your CREATE statements for the test case tables &
indexes so I can play around with it? I'd like to see if setting
"_table_lookup_prefetch_size"=0 eliminates the "db file scattered read"s
and what kind of difference it makes on performance.
Thanks,
Brandon
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Christian Antognini
I have a test case with which I can reproduce it at will.
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