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IDS Forum

Re: Logical logs - push or pull?

Posted By: Madison Pruet
Date: Thursday, 3 October 2013, at 10:34 a.m.

In Response To: RE: Logical logs - push or pull? (Alexandre Marini)

Instead of push/pull, it might be better to use the term event driven o=
r
probe driven. A push model is event driven. And in this case we are us=
ing
the IDS alarm handler as the event. A pull model would use a probing
technique. By that we mean some external program probes to see if thing=
s
need to be done and then perform the operations if they need to be done=
.
Event driven models tend to have lower latency.

Sent from my iPad

> On Oct 3, 2013, at 7:59 AM, "Alexandre Marini" <alexandre@briug.org>
wrote:
>
> Hello.
> It is always the best practice to pull the logs, but make sure you ha=
ve
enough
> backup window in your SM/drives, so that your backups will not be han=
g in
the
> line.
>
> This is great for dedicated drives, but if your SM is managing severa=
l
> databases/OSes backups, you might face some long periods of long back=
up
lines.
>
> You can also modify your alarmprogram, so that Informix only starts t=
o
pull
> the logs after some amount of logs are not backed up. If you need hel=
p,
please
> advice.
>
> Regards.
>
> Alexandre Marini
> IBM Informix Certified Professional v10 / v11.50 / v11.70 / v12.10
>
> IBM Information Management Informix Technical Professional
>
> IBM Infosphere DataStage Technical Professional
> Informix Senior DBA - Orizon Brasil
> BRIUG website administrator
> Informix independent consultant
>
> > To: ids@iiug.org
> > From: smiley73@gmail.com
> > Subject: Re: Logical logs - push or pull? [31590]
> > Date: Thu, 3 Oct 2013 09:03:33 -0400
> >
> > Bill
> >
> > By pushing the logs you are sure they get backed up the instant the=
y
fill
> > and
> > so your roll-forward point is as recent as possible. If you pull th=
e
logs
> > (depending on your interval between the pulls) you may not get a lo=
g
backed
> > up for some minutes after it fills. If you lose your machine in thi=
s
period
> > and
> > have to restore then you will not have this log to use for
roll-forward.
> >
> > Would not be an issue if the pull process could switch to the next =
log
> > before
> > pulling but I don't know if that is possible.
> >
> > Keith
> >
> > On 3 October 2013 13:01, BILL GLIDDEN <bglidden1962@gmail.com> wrot=
e:
> >
> > > Good morning folks,
> > >
> > > We have implemented On-Bar with the CommVault Simpana storage man=
ager
> > > (love it
> > > so far!). I'm wondering if there is any advantage either way to a=
)
letting
> > > Informix backup the logical logs through ALARMPROGRAM (push) or b=
)
> > > scheduling
> > > periodic logical log backups through Simpana (pull)?
> > >
> > > I have my own opinion on this, but would like some other opinions=
so
that
> I
> > > can state my case with backup :)So even if your thoughts are basi=
c,
and
> you
> > > feel like answering, go for it.
> > >
> > > Thanks!
> > >
> > >
> > >
> > >
> >
>
***********************************************************************=
********

> > > Forum Note: Use "Reply" to post a response in the discussion foru=
m.
> > >
> > >
> >
> > --001a11332252dec53504e7d5cf0d
> >
> >
> >
>
***********************************************************************=
********

> > 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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