IDS Forum

RE: how informix archive works?

Posted By: miyaki
Date: Saturday, 22 May 2004, at 4:31 a.m.

In Response To: RE: how informix archive works? (Ravi T )

Actually I was doing some testing on my test server
after observing some abnormality of database archive
running on my production server.

I have a cron job to run database archive once a day
at my production server. The first observation I
noticed is the duration of archive will become longer
and longer. I can assure that this was not caused by
the surge of data volume in the database as total used
chunks size was still the same. The archive will take
more than 3 hours to complete when the database is
running more than few weeks. The duration of the
archive is increase gradually. However, after i did a
dbexport-import, the archive was back to normal which
is only take ~20 min to complete on the entire
database. I think this could be caused by the bug that
you all mentioned.

The second observation I noticed is if I run second
archive again on the same day, it will usually take
faster than the first archive. The first archive might
take up to 3 hours, however, the second run will not
take more than 90 min. As I mentioned earlier, i have
a cron job to run the archive once a day. Sometime i
will need to perform another archive on the same day
due to ad-hoc reqeust (sometime the gap between the
first and second archive is about 3-4 hours). This
symptom does not happen one time only. In fact, I'm
able to reproduce it at my test server. This is the
doubt that i have, Why the second archive will run
faster than the first archive?

--- Ravi T <ravit29@yahoo.com> wrote:
> Yes Miyaki,
>
> Keith is correct.
>
> Provide us more information please !
>
> 1. Is this a one time deal or does this happen each
> time you perform this archive ?
>
> 2. What is the reason for you to run 2 archives one
> after the other ?
>
> 3. What is the time difference between the two
> archives ?
>
> etc.
>
> Thanks.
>
> "Simmons, Keith" <keith.simmons@office2office.biz>
> wrote:
> Miyaki
>
> I have absolute confidence in the Informix archive.
> I too back up using
> ontape and have restored (to a test machine) on
> numerous occasions with no
> problems.
> Do you have some very old data in your database? It
> could be you are
> encountering the 'archive very old page' bug which
> slows the archive while
> it updates the timestamp on very old pages. Once
> they have been updated (and
> if there is no other activity on the system) they
> will not need to be
> updated if you archive again immediately after.
> You do not say what the normal length of time of an
> archive is, or is this
> the first archive for some days (weeks, months)?
> A bit more information.
>
> Keith
>
> -> -----Original Message-----
> -> From: miyaki [mailto:lcib@yahoo.com]
> -> Sent: Thursday, May 20, 2004 4:27 AM
> -> To: ids@iiug.org; informix-list@iiug.org
> -> Subject: how informix archive works?
> ->
> ->
> -> Hi all,
> ->
> -> I have some doubt on the informix backup. I'm
> using
> -> ontape command to perform level 0 backup on my
> Test
> -> database (7.31.UC2). The first level 0 backup
> took
> -> around 2 hours to complete and the second time of
> -> level 0 backup only took ~45min. The second time
> of
> -> the backup begin right after the first backup
> -> completed. There's no other transactions running
> on
> -> the database during the backup. Which means that
> the
> -> data for both archive is exactly identical. My
> -> question is why second backup take shorter
> duration to
> -> complete compare to the first backup
> ->
> -> Does any one of us know where can i obtain the
> -> documentation to describe how informix archive
> works?
> ->
> -> TIA,
> -> miyaki
> ->
> ->
> ->
> ->
> -> __________________________________
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> -> sending to informix-list
> ->
>
>
>
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Messages In This Thread

• RE: how informix archive works?
  Simmons, Keith -- Thursday, 20 May 2004, at 4:06 a.m.
  • RE: how informix archive works?
    Ravi T -- Thursday, 20 May 2004, at 10:04 a.m.
    • Re: how informix archive works?
      Konstantin Kaduk -- Thursday, 20 May 2004, at 12:35 p.m.
    • RE: how informix archive works?
      miyaki -- Saturday, 22 May 2004, at 4:31 a.m.
  • RE: how informix archive works?
    André Déziel -- Friday, 21 May 2004, at 8:02 p.m.

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