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Home -> Community -> Usenet -> c.d.o.server -> Re: Maxing CPU
Hi Wayne,
Congratulations, you did what all DBA's dream of, remove all I/O and become CPU bound! Did you know that it takes 6 times the CPU for a buffer get to disk then to memory? Did you know that seek times for disk are measured in millionths of a second, while seek times to memory are measured in billionths of a second.? That is up to a 1000:1 performance gain. Your goal should be to make a memory only database, and perhaps you have come close to succeeding.
Probably a more important question than the use of the CPU's is: Did response times decrease after your changes? If they did, you are running as expected, and your tuning was successful. If they increased, then your tuning was not successful.
Remember that tuning and performance are all relative. If you don't have a baseline to compare against, then making the changes are fun and interesting, but not productive.
As a comparative, I worked on a PeopleSoft Financials that was running on an HPT500 with 4 200Mhz CPU's and 1 gig of memory. After tuning the Oracle instance and the operating system, it was common to use the CPU's at 100%. It did mean that we could get better performance with more CPU's, and that's a good thing (they were on order when I left). This was a 40 gigabyte database. Our tuning improved performance anywhere from 2:1 to 10,000:1.
If you are really interested in what's going on with your database, check out
www.icetcorp.com
We have a demonstration program that you might find enlightening (just follow the penguin!).
Thank you,
Joel R. DeRider
CEO -- Information Consulting Expert Technology, Inc.
Please visit our web site at: http://www.icetcorp.com and read about IceT Corporation's innovative new enterprise database management product "ClariT for Oracle"!
Wayne S. March wrote in message <73n1hs$5uc_at_bgtnsc02.worldnet.att.net>...
>To All,
>
>I am running ORACLE and PeopleSoft on NT on a 4 200 Mghz Pentium Pro box
>with one gig of memory.
>I just tuned the box to have
>shared_pool_size = 104000000
>db_block_buffers = 20000
>db_file_multiblock_read_count = 16
>log_buffer = 534000
>db_block_size = 2048
>sql_sort_area = 2000000
>
>Now when 10 or so users run reports I sometimes notice that Oracle is
>running all
>four cpus at 100%..Any Ideas
>
>Wayne
>
>
>
Received on Fri Nov 27 1998 - 14:40:35 CST
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