Actually I thought the same thing about reading all the input datasets so I tried an experiment on it. I copied 4 datasets to 2 new packs (about 4000 cylinders of MXG monthly PDB datasets) and the copy took about 10 minutes wall time and consumed about 10000 EXCPs to create these 4 datasets. I then ran the DUMP with the output to DD DUMMY and the entire thing consumed 161 EXCPs and ran in 1 second wall clock time. So apparently DFDSS is smart enough to not copy data that is going to DD DUMMY.
Rex -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Joel C. Ewing Sent: Monday, May 01, 2006 10:28 PM To: [email protected] Subject: Re: ISPF Option 3.4 and System Search for all Files with A*.NC2.* Glen.Gasior wrote: > I would not assume the search done by ISPF is the same as the search > done by DFSMSDSS. ISPF will search through all catalogs and not limit > itself to the standard catalog search if there is a wildcard in the > first hlq. I do not know about DFSMSDSS. You may need to know the > details of each search algorithm to know if they are equivalent. > Several potential problems with the suggested DFDSS approach: DFDSS will only find datasets on primary volumes - any datasets migrated to ML1 or ML2 will be ignored and not deleted. Although the indicated job will not actually write any data to the DUMMY output dataset, the DFDSS DUMP will still incur the overhead of reading through all data of the datasets being deleted. The TOL(ENQF) should become a problem (delete failure) when it is time for the DELETE to occur if any other address space has the dataset enqueued. If there are not that many datasets and migration is a possibility, I would be tempted to look for some BATCH REXX approach with LISTC and DEL, which would handle migrated datasets. If there were 5K+ datasets involved, using the Catalog Search Interface to identify the datasets rather than LISTC would take more work but would be considerably more efficient. -- Joel C. Ewing, Fort Smith, AR [EMAIL PROTECTED] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
