How to free up memory unused by cataloged datasets thru JCL?

raghavendra_p_sarvade · New User Joined: 17 Oct 2006 Posts: 32

Hi,

We generally give 'F' against datasets to free up unused memory.

I need to free up on all datasets with same HLQ.

For example HHHHHH.*

Is there any means to do this thru a batch JCL or thru a common TSO command?

Thanks,
Raghav

dick scherrer · Posted: Sat Feb 13, 2010 9:47 am

Hello,

Suggest you consider adding RLSE to the JCL that allocates these datasets rather than free the unused space later. . .

I don'tknow of any single tso command to do this wholesale.

expat · Posted: Sat Feb 13, 2010 2:01 pm

Use the DFdss RELEASE statement. Dfdss also has excellent filtering capabilities.

Use Net · New User Joined: 10 Feb 2010 Posts: 8 Location: Europe

If these files are in the SMS environment, your sysprog can update the MGMTCLAS to set the value of the PARTIAL RELEASE option to YES IMMED. This sets RLSE as a default when files allocated under the MGMTCLASses you update are CLOSEd.

This is good option because you don't have to update the JCL, but it may have an improper secondary effect, for example if the MGMTCLAS you set to YES IMMED is used for DAM files, or for SAM files often used with DISP=MOD.

Nothing is perfect.

Robert Sample · Posted: Sat Feb 13, 2010 8:28 pm