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- Newsgroups: comp.databases.ingres
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!uvaarpa!cv3.cv.nrao.edu!mail-to-news-gateway
- From: Gavin Trigg <gavin@asis.unimelb.EDU.AU>
- Subject: Re: Number of slave processes?
- Message-ID: <199208120657.AA20733@mulgulgum.asis.unimelb.EDU.AU>
- Sender: root@nrao.edu (Operator)
- Organization: National Radio Astronomy Observatory
- Date: Wed, 12 Aug 1992 21:57:23 GMT
- Lines: 40
-
- >
- > Hello,
- > I am DBA for an Ingres 6.3/01 installation on a Sun 4/470 (SunOS 4.1.1)
- > We have the four Ingres components /ingresdb, /ingresvar, /ingreslog and
- > /licence/ingres each on a separate disk.
- > We have been experiencing deadlock problems and I have experimented
- > with decreased fillfactors in the (btree) tables which are most heavily
- > used, also with adding secondary indexes to these tables.
- > However, the problems continue.
- >
- > We are still only running two slave processes and I am wondering if it
- > would be advantageous to increase this number to 4, or maybe more.
- > Could anyone advise me of a suitable number, and perhaps of some check I
- > could make 'before and after' to see what improvement, if any, has been
- > gained.
- >
- > Thank you,
- >
- > Cristy
- >
- > Also known as:
- > cristyn.emmett@newcastle.ac.uk
- > ******************************
- >
- Cristy,
-
- Deadlock has nothing to do with location of components or number of slaves.
- Fillfactors MAY have an effect. The things to look for are lock escalation
- (look in errlog.log), number of locks and appropriate locking strategies
- (shared vs. exclusive). There is a section in the DBA guide that discusses
- all this. IPM is invaluble in finding out what locks and their type have been
- taken on which pages or tables. I'm not sure about 6.3 but certainly at 6.4
- there is the ability to 'trace' which locks have been taken by the individual
- sessions.
-
- --
- Gavin Trigg Internet: gavin@asis.unimelb.EDU.AU
- Telephone: +61 3 344 6003 Fax +61 3 347 4803
- Data Base Administrator, Information Technology Services (ASIS),
- The University of Melbourne, Parkville, Australia. 3052.
-