Victor,
Logical dump of compressed format data sets does not decompress them.
This quote from the DFSMSdss Storage Administration sort-of implies that:
"1. The COMPRESS keyword is ignored if it is specified during a logical
data set dump for either compressed-format sequential data
sets or compressed-format VSAM data sets."
(The COMPRESS keyword specifies that DFSMSdss should compress the output
dump data set before writing it to output medium - so, double compression is
being avoided here).
COPY must decompress an extended-format compressed data set when copying it
to a basic-format data set (on tape).
Best Regards,
Yifat
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf
Of Victor Zhang
Sent: Wednesday, April 11, 2012 3:52 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: Questions regarding SMS compacted dataset
Yifat,
Thank you very much, very help.
One more question:
Does both physical dump and logical dump NOT decompress extended compacted
PS dataset OR Does physical dump NOT decompress extended compacted PS
dataset OR Does copy decompress extended compacted PS dataset?
Regards
Victor
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