So you would suggest taken the system offline and running a sweep
on a nightly basis?


--- In firebird-support@yahoogroups.com, "Rick Debay" <rdebay@r...>
wrote:

> We run a sweep every night in a cron job, a sweep triggered by an
> interval would affect a real user.
>
> -----Original Message-----
> From: firebird-support@yahoogroups.com
> [mailto:firebird-support@yahoogroups.com] On Behalf Of berniebialt
> Sent: Thursday, June 09, 2005 9:19 AM
> To: firebird-support@yahoogroups.com
> Subject: [firebird-support] Re: Poor Performance
>
> Ann:
>
> I ran gstat -h this morning after "sweeping" the database from

yesterday

> and there is almost a 1,000 transaction difference between "Oldest
> Active" and "Next Transaction". This is certaintly more than

several

> hundred which is the number I believe that you indicated could

cause

> performance problems. All though the performance is still fine

today, I

> am wondering if I should be "Sweeping" this database on a nightly

basis,

> or set the sweep interval at a low level. I am trying to get my

arms

> around what these numbers represent, what is affecting them, and

if they

> are the root of the problem. Any input would be greatly

appreciated.

>
> Thanks!
>
> Bernie
>
>
> Database header page information:
> Flags 0
> Checksum 12345
> Generation 525487
> Page size 4096
> ODS version 10.1
> Oldest transaction 524565
> Oldest active 524566
> Oldest snapshot 524565
> Next transaction 525474
> Bumped transaction 1
> Sequence number 0
> Next attachment ID 0
> Implementation ID 16
> Shadow count 0
> Page buffers 0
> Next header page 0
> Database dialect 3
> Creation date Jul 14, 2004 20:58:53
> Attributes force write
>
> Variable header data:
> *END*
>
>
> Thanks!
>
> Bernie
>
>
> --- In firebird-support@yahoogroups.com, "Ann W. Harrison"
> <aharrison@i...> wrote:
> > berniebialt wrote:
> > > Ann:
> > >
> > > Thanks for respond to me. I ran gstat and here are some of

the

> > > details that I see:
> > >
> > > Oldest Transaction 434143
> > > Oldest Active 446334
> > > Oldest Snapshot 446334
> > > Next Transaction 446335
> > >
> > > Is the issue the difference between Oldest Transaction and

Next

> > > Transaction?
> >
> > No, the problem would be between the oldest active and the

next.

> In
> > this case, there's only a single transaction running. To analyze
> the
> > problem, you're going to have to run gstat -h when the

performance

> is bad.
> >
> > > I noticed it is a differnce of over 12000. If this is the

problem,

> > > what would cause this to occur? and how could I keep this from
> > > happening going forward.
> > >
> >
> > The oldest transaction - also called the oldest interesting
> transaction
> > - is the oldest transaction in any state other than committed.
> Sweep
> > moves that number along. 12000 is not very bad.
> >
> > Regards,
> >
> >
> > Ann
>
>
>
>
>
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