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Overall database tuning

From: Yechiel Adar <adaryechiel_at_hotmail.com>
Date: Sun, 14 Apr 2002 11:48:17 -0800
Message-ID: <F001.004440B9.20020414114817@fatcity.com>


Hello list

We have bought a package for our dealing room. The package runs on oracle 8.1.6.3.0 on NT with about 50 users.

Last week I got complains that the programs are slowing down. They want me to do a database tuning even to prove that the slowdown is not in the DB but in the application.

Where to start?

Yechiel Adar
Mehish
----- Original Message -----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Sent: Friday, April 12, 2002 4:23 AM

> No enough inserts to bog down the CPUs?
>
> --- Paul Baumgartel <treegarden_at_yahoo.com> wrote:
> > Thanks, Mohammed and Anjo, for your replies.
> >
> > Now my question is this: given that the table structures (freelists,
> > etc.) are identical on the two machines, the init.ora parameters are
> > identical for the two instances, and the machines themselves are
> > nearly
> > identical (one has 6 CPUs, one 4, but in neither case are the CPUs
> > anywhere near maxed out), what could be causing the discrepancy?
> >
> > PB
> >
> > --- Mohammed Shakir <mshakir08816_at_yahoo.com> wrote:
> > > data block waits is the indicator of freelists contention. I have
> > > never
> > > seen a freelists contention, even though I have been running 11
> > > processing doing inserts using 11 CPUs. I have seen library cache,
> > > Shared pool and cache buffer chains waits. I took care of buffer
> > busy
> > > waits and db file sequential reads by increasing freelists,
> > initrans
> > > to
> > > 11 and by partitioning the disks. In my case most of the data was
> > > writting to the same block by as many as 9 processes. I am working
> > on
> > > a
> > >
> > > Sparc 4500 Solaris 2.1.6 with Oracle 8.1.6.0 and 8.1.7.2
> > >
> > > Library Shared Pool latch contention was found due to Literal or
> > > non-shared SQL. Check SQL_text in SQLarea to find literal SQL.
> > Shared
> > > Pool contention seems to be due to a very large Shared pool. I
> > found
> > > a
> > > bug report that indicates that cache buffer chain problem was fixed
> > > in
> > > 8.1.3.4 and 9.0.1.3
> > >
> > > Cache buffer chain is also an indicator of high physical and
> > logical
> > > I/O. You can check on that as well.
> > >
> > > Hope this helps.
> > >
> > > Shakir
> > >
> > > --- Paul Baumgartel <treegarden_at_yahoo.com> wrote:
> > > > Greetings!
> > > >
> > > > I am trying to diagnose a performance difference between two
> > > > databases
> > > > running the same test. They are similarly configured (same SGA
> > > size,
> > > > etc.), and the servers are identical except for the number of
> > CPUs
> > > > (server A has 4, server B has 6).
> > > >
> > > > On database A, INSERT performance is about 190 rows/second.
> > > >
> > > > On database B, INSERT performance is over 500 rows/second.
> > > >
> > > > I saw some cache buffers chains, buffer busy, and library cache
> > > latch
> > > > waits on database A while the test was running, as well as redo
> > log
> > > > sync waits. The waits didn't seem excessive, though. I checked
> > > for
> > > > "checkpoint not complete" redo allocation messages in database
> > A's
> > > > alert log and found none. The db_block_lru_latches parameter is
> > > set
> > > > to
> > > > one-half the number of CPUs in both machines.
> > > >
> > > > I'd much appreciate any suggestions as to what else to check. I
> > > know
> > > > that freelists can be an issue (there are multiple sessions
> > > > performing
> > > > inserts); how can I check to see if there's freelist contention?
> > > > Anything else I should investigate?
> > > >
> > > > Many TIA,
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > =====
> > > > Paul Baumgartel, Adept Computer Associates, Inc.
> > > > paul.baumgartel_at_aya.yale.edu
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > __________________________________________________
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> > > > --
> > > > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > > > --
> > > > Author: Paul Baumgartel
> > > > INET: treegarden_at_yahoo.com
> > > >
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> > >
> > > =====
> > > Mohammed Shakir
> > > CompuSoft, Inc.
> > > 11 Heather Way
> > > East Brunswick, NJ 08816-2825
> > > (732) 672-0464 (Cell)
> > > (732) 257-6001 (Home)
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Yahoo! Tax Center - online filing with TurboTax
> > > http://taxes.yahoo.com/
> > > --
> > > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > > --
> > > Author: Mohammed Shakir
> > > INET: mshakir08816_at_yahoo.com
> > >
> > > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> > > San Diego, California -- Public Internet access / Mailing
> > > Lists
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> >
> > __________________________________________________
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> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Paul Baumgartel
> > INET: treegarden_at_yahoo.com
> >
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> > San Diego, California -- Public Internet access / Mailing
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>
> =====
> Mohammed Shakir
> CompuSoft, Inc.
> 11 Heather Way
> East Brunswick, NJ 08816-2825
> (732) 672-0464 (Cell)
> (732) 257-6001 (Home)
>
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Tax Center - online filing with TurboTax
> http://taxes.yahoo.com/
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Mohammed Shakir
> INET: mshakir08816_at_yahoo.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Yechiel Adar
  INET: adaryechiel_at_hotmail.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
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Received on Sun Apr 14 2002 - 14:48:17 CDT

Original text of this message

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