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IDS Forum

Re: need quick way to find whom is causing Blocked

Posted By: John Miller iii
Date: Monday, 4 March 2013, at 1:19 p.m.

In Response To: need quick way to find whom is causing Blocked:LON (John Adamski)

Just a few points here.

Killing a session who is rolling back a long transaction will not help.
The servers undo daemon will assume the rollback for this session.

I believe what you want to look at is the difference between these two
parameters. The first parameter LTXHWM will automatically force
the session to start a rollback and NO other users will be effected by this
one persons rollback. LTXEHWM (the parameter with the "E")
is the threshold which provides EXCLUSIVE access to the logical logs and
block all users attempting to write data. If you encounter
this blockage my suggestion would be to increase the difference between
this to values. By default hey come set at 70% and 80%. My
suggestion would be to drop LTXHWM to 50%, What this means is any
transaction which consume more than 50% of the logical logs will
be forced to rollback and if it consume up to 80% of the logical logs it
will stop others from writing to the logical logs and provide this
transaction with exclusive resources.

# LTXHWM - The percentage of the logical logs that can be
# filled before a transaction is determined to be a
# long transaction and is rolled back
# LTXEHWM - The percentage of the logical logs that have been
# filled before the server suspends all other
# transactions so that the long transaction being
# rolled back has exclusive use of the logs

The other solution would be to utilize dynamic logs, which causes the
logical logs to grow upon hitting a long transaction.

My last point would be to let you know that onstat -x has been enhanced to
provide an estimation of how long it
will take to rollback transactions. The column in onstat -x is called

If you want to look at this information programmatically look at the table
called sysmaster:systxptab

John F. Miller III
STSM, Lead Architect
IBM Informix Dynamic Server (IDS) wrote on 03/04/2013 08:09:28 AM:

> From: "John Adamski" <>
> To:,
> Date: 03/04/2013 08:21 AM
> Subject: need quick way to find whom is causing Blocked.... [29670]
> Sent by:
> 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
> while. I was informed while in a meeting that the "database is down"about
> minutes after the Blocked:LONGTX started.
> It took me a way too much time to find the session that had the block and
> kill that session; I was wonder what would have been the quickest way to
> 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

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

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