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IDS Forum

RE: fast recovery

Posted By: Andrew Ford
Date: Thursday, 24 July 2014, at 11:19 a.m.

In Response To: Re: fast recovery (Art Kagel)

To help prevent this in the future you can also consider lowering you LTXHWM
to trigger the rollback sooner.

This works if you have a system like mine that should usually not have a
transaction that runs over 5 minutes and if there is a big transaction like
this it needs to be run during a maintenance window and I can adjust the
LTXHWM setting up before hand to allow it.

LTXHWM is usually configured way too high IMO. If you know a transaction
that spans 10% of your logical logs indicates some malformed SQL then why
not adjust LTXHWM down to 10 from the crazy high default setting to avoid 8
hour rollbacks?

Doesn't really help with your long fast recovery problem, but can help
prevent it in the future.

You could try support, I believe they can truncate your logical logs to
right before your long transaction starts, but that has the unfortunate side
effect of losing all of the work that was done after the longtx started. If
you have a way to redo this work and you need the system back ASAP that
could be an option.

Like Art said you can watch onstat -r 1 -D and onstat -r 1 -g act to see if
the engine is actually doing something. If it is then you should eventually
get out of fast recovery.


-----Original Message-----
From: [] On Behalf Of Art
Sent: Thursday, July 24, 2014 7:56 AM
Subject: Re: fast recovery [33429]

The only monitoring you can do is to run onstat -D, onstat -g iof, and
onstat -u to see IO activity.

In the future, besides remembering to alter the table to RAW and inceasing
the number of recovery threads in your ONCONFIG file, try using my dbdelete
utility for large deletes. It deletes 8192 rows in a transaction and
commits. Also, it tends to be faster than just DELETE FROM <table> when
there are many rows being deleted using filters on indexed columns.


Art S. Kagel, Principal Consultant
ASK Database Management


Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on the IIUG, nor any other organization with which I am
associated either explicitly, implicitly, or by inference. Neither do those
opinions reflect those of other individuals affiliated with any entity with
which I am affiliated nor those of the entities themselves.

On Thu, Jul 24, 2014 at 7:58 AM, <> wrote:

> Aix 6.1
> IDS 11.70.fc3
> Had a transaction reach the long transaction HWM after running for
> about 5 hours...I know .. error in the sql statement to switch the
> table to raw before doing this mass delete .. anyways ... attempted to
> onmode -z sessionid .. that resulted in the engine going down ...
> The system has now been in fast recovery for over 8 hours ... Anyone
> got any suggestions as to onstats that I can run to make sure it's
> really doing something, and to get an idea of how much longer...
> Doesn't seem like much IO is going on ..
> Thanks for the help ....
> Peter Logan
> Database Administrator
> SpartanNash INC.
> Office: 616/878-8309
> Mobile: 616/304-9672
> Forum Note: Use "Reply" to post a response in the discussion forum.


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

Messages In This Thread

  • fast recovery -- Thursday, 24 July 2014, at 7:58 a.m.
    • Re: fast recovery -- Thursday, 24 July 2014, at 8:11 a.m.
    • Re: fast recovery
      Art Kagel -- Thursday, 24 July 2014, at 8:55 a.m.
      • Re: fast recovery -- Thursday, 24 July 2014, at 9:17 a.m.
      • RE: fast recovery
        Andrew Ford -- Thursday, 24 July 2014, at 11:19 a.m.

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