Hi
When I am running a DB2 program I am getting S04E abend code with "00E20004" as reason code.
When I look into the explanation for the reason code
Explanation: In order to satisfy an unconditional request for storage
the get variable storage function needed to obtain additional storage
(from GETMAIN) to expand a storage pool. However, the pool attributes
defined at the time the pool was created indicated that the pool was
already at maximum size.
whats the spool? I am unable to loacte to which spool the explanation speaks about
Please help me

You should read "Please read before posting", as the number one request is:

1) Every question posted must include your DB2 Version, fixpack and Edition + your Operating System(including version info) + info on any third party software you use.

But it sounds like DB2 on z/OS or OS/390. If you check the messages guide, under 'Problem Determination', you'll see there in information logged in SYS1.LOGREC, and you should have taken a DB2 dump. Register 4 contains the address of the pool (not spool) header block (PHB). You can also check the Diagnosis Guide for more info on gathering and reposting this error.