change in storage mentioned in DC390020 and DC390007

Document ID : KB000072171
Last Modified Date : 26/02/2018
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Question:
Since upgrading IDMS release 16.5 - 18.5- I see a large decrease in amount of storage mentioned in messages- DC390020 and DC390007 at startup. 
Since we made no sysgen changes related to pool size , why is there a difference?
Answer:
Due to new SCRATCH sysgen parameters, the Scratch area size is calculated and 
allocated later in the startup process than before and not included in the DC390020 message. 
DC390007 is built from this value plus the difference of DC390006 and DC390005. 
The size and location of the scratch area can be checked with the 
DCMT D SCRATCH command.