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IDS Forum

Re: AW: AW: Tuning Checkpoints

Posted By: Madison Pruet
Date: Tuesday, 11 December 2007, at 9:52 a.m.

In Response To: AW: AW: Tuning Checkpoints (

We do not ship log files with HDR, we ship log buffers.

Madison Pruet, STSM
IDS Replication Architect


"Andreas.KUTSCHE@ =" =

<andreas.kutsche@ =
To> =

Sent by: =

ids-bounces@iiug. =

org Subj=

AW: AW: Tuning Checkpoints [106=


12/11/2007 02:40 =

AM =



Please respond to = =



Hi Art,

I hope your remarks about HDR and checkpoints are valid only if DRINTER=
set to -1 (synchronous update) ? Otherwise I can't imagine how HDR can =
for a large high performance production system? And what happens if the=

secondary or the network connections become unavailable for some time?

Andreas Kutsche

SPAR =D6sterreichische Warenhandels-AG
A - 5015 Salzburg, Europastrasse 3
FN 34170 a

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-----Urspr=FCngliche Nachricht-----

> Von: [] Im Auftrag vo=
> S. Kagel (Oninit LLC)
> Gesendet: Montag, 10. Dezember 2007 21:10
> An:
> Betreff: Re: AW: Tuning Checkpoints [10672]
> > Over the weekend, I moved the indexes for the two tables with the m=
> io to
> > separate dbspaces. I also changed the check point interval to 30
> seconds. I
> > believe we are seeing some improvement but we are still seeing some=

> downs
> > and some large checkpoints.
> >
> > I forgot to mention in my original post that we are using HDR for
> replication
> > to another server.
> >
> Hmm, I don't remember, are your logical logs each rather large? Becau=
> the log containing the new checkpoint record has to be sent to the HD=
> secondary and the primary will wait for the secondary to acknowledge
> that it has caught up to the checkpoint before it releases the
> checkpoint state. For its part, the secondary has to complete the
> roll-forward of all outstanding logical log records pushed to it up t=
> the checkpoint record before it will acknowledge the checkpoint to th=
> primary.
> There's a fair chance that this is at least part of the problem. Is t=
> secondary slower than the primary? Is the WAN/LAN connection between
> them slower than disk channels? Is the secondary tuned properly?
> Art S. Kagel
> >
> >
> *****
> > Forum Note: Use "Reply" to post a response in the discussion forum.=

> >
> >
> *****
> Forum Note: Use "Reply" to post a response in the discussion forum.


Forum Note: Use "Reply" to post a response in the discussion forum.


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