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IDS Forum

Re: To read only committed rows from a table

Posted By: Bill Hamilton
Date: Wednesday, 4 January 2012, at 1:21 p.m.

In Response To: Re: To read only committed rows from a table (Fernando Nunes)

Speaking of lock mode --- is there STILL no way to set it in onconfig file
to default to "wait X" or do we still have to set after each connection ?
( I am speaking of 11.70.TC3IE)
It is wasteful to execute the "set" statement (in c++ or c# or whatever)
upon each connection.
If "not wait" is set then one must loop to retry an update ( also
wasteful ). If you don't, then things rollback on a busy server and users
get unhappy.
With all the improvements done to IDS one would think that the lock mode
default would be put into onconfig.
Was IBM just to busy to fix this, or do they like us to suffer or make our
own code harder to read?
I did have several programs (written by departed programmers) that blew out
at busy times.
When I added "set lock mode to wait 10" the problems went away completely.
Ten seconds is like infinity and the next waiter gets the row.
( all tables use row locking)

-----Original Message-----
From: Fernando Nunes
Sent: Wednesday, January 04, 2012 4:28 AM
Subject: Re: To read only committed rows from a table [25807]

Ths committed read is working as expected. It tells the engine that it
should not ignore other session locks (like dirty read does) and at the
same time that it should not lock the rows it reads (like repeatable read
does). The session behavior when working in committed read, when it finds a
lock depends on the LOCK MODE.
If LOCK MODE is set to NOT WAIT the session immediately receives an error.
If it's WAIT n, then it waits at most "n" seconds. If after "n" seconds the
lock is still there, the error is raised. Finally it you SET LOCK MODE TO
WAIT; (without a number) then the session will wait forever.

This is how it works, and it's explained in the manual.
In your specific case I think you need to check why the other process is
holding locks for 2 minutes and try to reduce that time.
The condition on the timestamp could be used if you set it to
"timestamp_field < CURRENT - 2 UNITS MINUTE" for example... but for this to
work you'd probably need an index on that column... If you're doing a full
scan for example, you'd hit the locks anyway...

Or you could "accept" the error and process whatever lines you get... And
retry later hoping that you'll grab some more rows and so on... This could
be a way to do it assuming both processes are run frequently and
concurrently. If not, than simply offset the execution times of both

To end this, this is a clear example of the costs of being stuck with old

On Wed, Jan 4, 2012 at 9:37 AM, NAVEEN NAIK <> wrote:

> Thanks all for your replays.
> I should have mentioned the Informix version I am using. Apologies for
> that.
> I am using the IDS 9.4
> The last committed is not working here :-(
> Is there any other way around this.
> I am also retrieving based on time stamp, but I am using a multi user
> environment.
> Some rows are committed before others.
> Row1 <Data> | 04-01-2012 10:33:33 | - Not yet committed
> Row2 <Data> | 04-01-2012 10:33:34 | - Committed
> Sometimes, Row2 with a greater time stamp gets committed before the
> another
> row which has lesser time stamp. And since row 1 is not committed I am
> getting
> the error.
> I was under the assumption that SET ISOLATION TO COMMITTED READ should
> have
> worked. Still wondering why it is not working.
> Regards,
> Naveen Naik
> Forum Note: Use "Reply" to post a response in the discussion forum.

Fernando Nunes
My email works... but I don't check it frequently...


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

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