I searched IBM web site very hard and couldn't find the explanation of memory pool names displayed by 'onstat -g ses'.
These pool names are abbreviations.
Is there any one can help me find related documents about this?
The pool names I concern are:
sapi, temprec, sqscb, keys, opentable,

What is your Informix version? OS?

Informix Dynamic Server 2000 Version is 9.21.HC4XM.
The box is a HP box.

In fact, this is a remote machine and I don't have privilege to access it.
People passed me the log dumped out by 'onstat', I analyze them.

The issue I got is, when our application (using informix jdbc methods to access database) running, the memory assign to the application sql session kept on growing. In fact, other memory pools size were quite stable except the pools I listed.

Check http://www.oninit.com/onstat

link the G's
onstat -g ses

There really is not detailed documentation like this - anything ending with scb, you can translate to session control block. The sapi, I believe references the server api for the datablade module.