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IDS Forum

Re: Error -243 ISAM -154 with Select sentence

Posted By: JACQUES RENAUT
Date: Friday, 4 January 2019, at 1:49 p.m.

In Response To: Error -243 ISAM -154 with Select sentence (ROGER VILCA)

Original post:

Hi,
We have a program esql/c that has the following sentences:

set isolation to dirty read;
set lock mode to wait 30;

The program makes several select, update and insert operations

Recently these error messages came out when executing a select statement:

error -243 (Could not position within a table) ISAM -154 (Lock Timeout Expired)

I wonder how it is possible that he has shown a blocking message despite having the sentence set isolation to dirty read;

The really weird thing is that this error occurred after executing a Select statement.

My environment is 11.70FC8 in HP-UX 11.31

Thanks in advance.

Response:

Well there's a couple things that pop to mind. First is isolation level is retained, meaning that if your esql/c program happened to execute a SPL and in the SPL it had code that did set isolation to something other then dirty ready, but didn't set it back before leaving, then the session wouldn't be executing at dirty read anymore (and thus could possibly wait for locks on a select and get the lock timeout error). Also, there is the $ONCONFIG parameter USELASTCOMMITED. That can override what you set your isolation to in the application and cause it to use committed read last committed isolation instead. Certain type of locks are waited on when using that isolation level and could therefore also get the -154 timeout error. I guess first thing I would do is verify the esql/c app is running (for it's duration) at the isolation level you think (ie dirty read) using onstat -g ses <session #> output. There's a isolation level field in there, and/or at least check to see if USELASTCOMMITTED is set to something or not.

Jacques Renaut
HCL Informix Advanced Support

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