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IDS Forum

RE: need quick way to find whom is causing Blo....

Posted By: John Adamski
Date: Tuesday, 5 March 2013, at 2:34 p.m.

In Response To: Re: need quick way to find whom is causing Blo.... (Art Kagel)

Art,

I have it on my to-do list to increase the log space and number of logs, but my 20 other hats I wear here always seem to get more of my time than my DBA work. Since it's only been on the to-do list for 2 years I won't be until 2020 until I get to it. :-D

I'll have to see if I can get this pushed a bit closer to the top.

Thanks for the advice.

John

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Art Kagel
Sent: Tuesday, March 05, 2013 8:13 AM
To: ids@iiug.org
Subject: Re: need quick way to find whom is causing Blo.... [29696]

My rule-of-thumb for logical logs is that you should have enough logical log space to last for 4 typical days worth of transactions so that if the log backups fail over a long weekend you don't have to worry about it until Tuesday when you get back to the office. ;-)

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on my employer, Advanced DataTools, 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 Tue, Mar 5, 2013 at 9:00 AM, John Adamski <adamski@graceland.edu> wrote:

> We have LTXHWM set to 50 and our logical logs are small compared to
> most Informix installs. So most of the time know one knows we
> experienced a rollback. This time the rollback got stopped and
> everything seems to have come to a screeching halt.
>
> John
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Andrew Ford
> Sent: Monday, March 04, 2013 12:05 PM
> To: ids@iiug.org
> Subject: RE: need quick way to find whom is causing Blo.... [29677]
>
> You might also want to modify the LTXHWM ONCONFIG from the default of
> 70% which can be kind of high depending on the amount of logical logs
> you have configured.
>
> For example, if you have 16GB of logical logs configured, do you
> really want a transaction to be able to span 11GB worth of logical
> logs before the engine identifies it as a long transaction and rolls
> it back?
>
> Andrew
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Art Kagel
> Sent: Monday, March 04, 2013 11:15 AM
> To: ids@iiug.org
> Subject: Re: need quick way to find whom is causing Blo.... [29675]
>
> Notice in Andrew's post that the output shows both the current log
> position and the beginning log position for the current transaction.
> You can have a cron or Informix Task Manager task poll this data
> periodically and find sessions with more than a given gap between the
> two and report them to you via text or email BEFORE they begin a
> formal LONGTX rollback so you can force a manual rollback at an
> earlier stage of the process. This will take less time to rollback and
> will not block anything.
>
> Art
>
> Art S. Kagel
> Advanced DataTools (www.advancedatatools.com)
> Blog: http://informix-myview.blogspot.com/
>
> Disclaimer: Please keep in mind that my own opinions are my own
> opinions and do not reflect on my employer, Advanced DataTools, 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 Mon, Mar 4, 2013 at 11:09 AM, John Adamski <adamski@graceland.edu>
> wrote:
>
> > OS: HPUX 11.31 (11iv3) on BL870x IA server
> > IDS: 11.70.FC4
> >
> > Friday afternoon we had a Blocked:LONGTX that locked up the database
> > for a while. I was informed while in a meeting that the "database is
> > down" about
> > 40
> > minutes after the Blocked:LONGTX started.
> >
> > It took me a way too much time to find the session that had the
> > block and to kill that session; I was wonder what would have been
> > the quickest way to find who had the block that was preventing the
> > rollback. As I'm sure I chose a less than speedy way to do find it.
> >
> > John Adamski, Sr. Network Specialist Graceland University, 1
> > University Place, Lamoni, IA 50140 adamski@graceland.edu
> >
> >
> >
> >
>
> **********************************************************************
> ******
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> >
> >
>
> --f46d042d051ca99e0d04d71c7e5a
>
>
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