Hi,
I have got from CICS admin, that for connection pooling I should set DB2_SERVER_CONTIMEOUT to 0. Executing "db2set -all" commnand on DB2 v9.5 FP2 on Linux this settings is not listed. So default parameter is taken.

How do I know which is default value for parameter if it is not specified?
Regards

try with db2 get db cfg

I'm sure if it's a valid registry variable its default value is listed in the manual.

I wouldn't normally look this up for you, but I was curious as to what is was:

DB2_SERVER_CONTIMEOUT

Operating system: All

Default: 180, Values: 0 to 32767 seconds

This registry variable and the DB2_DISPATCHER_PEEKTIMEOUT registry variable both configure the handling of a new client during connect time. DB2_SERVER_CONTIMEOUT allows you to adjust the time, in seconds, that an agent waits for a client's connection request before terminating the connection. In most cases, you should not need to adjust this registry variable, but if DB2 clients are constantly being timed out by the server at connect time, you can set a higher value for DB2_SERVER_CONTIMEOUT to extend the timeout period. If an invalid value is set, the default value is used. This registry variable is not dynamic

the books are very easy to use
see
DB2_SERVER_CONTIMEOUT

* Operating system: All
* Default: 180, Values: 0 to 32767 seconds