Newer version of the informix server support read ahead on the secondaries
which should greatly improve the response time of data which is not in
the cache.
John F. Miller III
STSM, Lead Architect
miller3@us.ibm.com
503-747-1366
IBM Informix Dynamic Server (IDS)
ids-bounces@iiug.org wrote on 05/18/2015 08:56:30 AM:
> From: "BENJAMIN THOMPSON"<benjamin.thompson@bskyb.com>
> To: ids@iiug.org
> Date: 05/18/2015 08:56 AM
> Subject: Re: tuning HDR [35123]
> Sent by: ids-bounces@iiug.org
>
> It's been a long time since I've used HDR with Informix 10. It went out
of
> continuing support in 2013.
>
> The BTScanner could be a factor in poor performance with the deletes.
>
> Was the database logged before HDR was switched on? If it was, then
> HDR should
> have minimal additional overhead and the most likely cause is slow
> performance
> on the HDR secondary or a poor network. Some questions: is it of the same
> specification as the primary server, working without issues etc.? Is
there a
> heavy reporting workload on the secondary? Is the network between
> the two fast
> and, more importantly, reliable?
>
> Ben.
>
>
>
>
>
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To post a response via email (IIUG members only):
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which should greatly improve the response time of data which is not in
the cache.
John F. Miller III
STSM, Lead Architect
miller3@us.ibm.com
503-747-1366
IBM Informix Dynamic Server (IDS)
ids-bounces@iiug.org wrote on 05/18/2015 08:56:30 AM:
> From: "BENJAMIN THOMPSON"<benjamin.thompson@bskyb.com>
> To: ids@iiug.org
> Date: 05/18/2015 08:56 AM
> Subject: Re: tuning HDR [35123]
> Sent by: ids-bounces@iiug.org
>
> It's been a long time since I've used HDR with Informix 10. It went out
of
> continuing support in 2013.
>
> The BTScanner could be a factor in poor performance with the deletes.
>
> Was the database logged before HDR was switched on? If it was, then
> HDR should
> have minimal additional overhead and the most likely cause is slow
> performance
> on the HDR secondary or a poor network. Some questions: is it of the same
> specification as the primary server, working without issues etc.? Is
there a
> heavy reporting workload on the secondary? Is the network between
> the two fast
> and, more importantly, reliable?
>
> Ben.
>
>
>
>
>
*******************************************************************************
To post a response via email (IIUG members only):
1. Address it to ids@iiug.org
2. Include the bracketed message number in the subject line: [35125]
*******************************************************************************