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IDS Forum

Re: Threads waiting on buffers

Posted By: Obnoxio The Clown
Date: Friday, 7 November 2003, at 4:06 a.m.

In Response To: Re: Threads waiting on buffers (Danny Wright)

No, but I have seen problems with about that many poorly-designed,
badly-indexed and badly used tables. :o)

--
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Obnoxio

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From: "Danny Wright" <dwright@sherwoodfoods.com>
>
>I haven't been keeping up - is 200 tables really all that much?
>
>Has anyone experienced performance problems or anything else from having a
>large number of tables? In our case, we're talking about 879 tables.
>
>----- Original Message -----
>From: "John Bejarano " <jbejarano@sbcglobal.net>
>
> > So, yes, we do have over 200 tables. Including system
> > catalog tables, there are 306 in this one database.
> > And looking at onstat -g dic (for the first time), I
> > see that 10 of the default 31 hash buckets are full
> > with 10 entries each. Many others are 8 or 9. Art, I
> > think you're showing your genius again. Thanks very
> > much for the suggestion.
> >
> > Having brought this up with technical support, they
> > recommend bringing DD_HASHSIZE up to 53 and DD_HASHMAX
> > up to 20. Those values seem reasonable to me, I think
> > we're going to go with them. (Shame this isn't
> > documented anywhere.) While tech support won't say
> > for sure that this could cause the issue we're seeing,
> > they seem to agree it might. Has anyone else had
> > their data dictionary thrash before? What effects did
> > you see?
> >
> > Madison, my LRU MAX and MIN are set to 2 and 1.
> >
> > --- "ART KAGEL, BLOOMBERG/ 65E 55TH"
> > <KAGEL@bloomberg.net> wrote:
> > > Do you have a large number of tables over all
> > > databases on this instance (over
> > > 200 or so)? Does onstat -g dic show the size column
> > > value on most lines that
> > > have an entry in the list# column are close to the
> > > Maximum list size value shown
> > > at the top? Do you have a relatively large number
> > > of tables with similar names
> > > that might all be hashing to the same one or two
> > > data dictionary buckets?
> > >
> > > If so it could be that the Data Dictionary cache is
> > > thrashing causing the
> > > dictionary entries in the cache for some active
> > > tables to be read from disk
> > > frequently. At peak this causes the buffer access
> > > storm on systables entries to
> > > reload the dictionary cache. Try increasing the
> > > data dictionary cache size.
> > > The ONCONFIG parameters are:
> > >
> > > DD_HASHSIZE - This must be prime. It is the number
> > > of hash table buckets unless
> > > you have a large number of tables with similar
> > > names increase this parameter
> > > before you play with DD_HASHMAX. (Default: 31)
> > > DD_HASHMAX - The number of slots in each hash
> > > bucket, if more than this number
> > > of tablenames hash to the same value because their
> > > names are very similar then
> > > increasing this one will remove the thrashing.
> > > (Default: 10)

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