I just got back from a little seminar from Quest with Gaja Krishna
Vaidyanatha and if he was dead (he's not that I'm aware of) he would be
rolling in his grave about your comments on hit rates and SGA sizes. His
new book 101 Oracle Performance Tuning will stress that you abandon those
hit rates and focus on V$SYSTEM_EVENT, V$SESSION_EVENT and V$SESSION_WAIT in
combination with CPU and IO stats. He states that Oracle is rather well
designed for physical IO. His presentation was great and I'm definatley
going to buy his book because I can learn something from this guy. So maybe
those small SGA's aren't so bad after all :)
http://www.amazon.com/exec/obidos/ASIN/0072131454/o/qid=991436418/sr=2-1/ref
=aps_sr_b_1_1/002-4814740-2092864
- Ethan Post
-----Original Message-----
Sent: Friday, June 01, 2001 4:35 PM
To: Multiple recipients of list ORACLE-L
As most everyone has said so far .... Its all subjective. What is large to
me .... is a dinky little thing to someone else.
Right now at my current job we have around 37 instances on 4 mchines with 2
GB or less of memory and 2 - 4 processors each. These DBs range from a 10
MB to a 70 MB SGA (yes, sounded real small to me when I got here also).
These databases are all in the realm of 60 - 100 GB of data each.
My last job we had 2 machines running 4 instances. These DBs had SGAs from
350 MB to 980 MB in size with 4 CPUs using 4 GB of memory. As far as size
goes, we had upwards of a Terrabyte of data.
To me, I have found that I have to treat both setups the same. They really
do have the same problems (space, hit rates, drive failures, hardware
failures, etc.) You just have to pay closer attention to certain aspects of
them differently. With the small SGAs we have to look real close at hit
rates and all the Memory Dependent aspects of the DB. With the large amount
of data on the other DB we had to look more closely at Data and file related
problems.
All I am trying to say is ......... its all subjective.
Kevin
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