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murali.andaluri
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Joined: 07 Jun 2013
Posts: 23
Location: USA
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I have attended client interview, they asked me the following question, please clarify.
There is an empty VSAM file, so whenever I am trying to read this empty VSAM file my JCL step should be abended, so what should I do for this? |
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dick scherrer
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murali.andaluri
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Joined: 07 Jun 2013
Posts: 23
Location: USA
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Hi Dick,
I have tried searching in portal, but didn't get satisfied solution.
He was asking daily we are receiving data in that file, suppose if you receive empty file instead of with data how you will abend your JCL?
Actually interviewer was asking me think whether you can do with listcat, but I didn't understand how to do with Listcat. |
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Akatsukami
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| Possibly because you can't reliably cause an abend with LISTCAT. |
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dick scherrer
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Hello,
Did you read the posted link?
You can read the output of the LISTCAT programmatically and then issue an abend or a flush depending on the empty /not-empty condition discovered by the LISTCAT. |
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Bill O'Boyle
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In a standalone step, issue an IDCAMS PRINT INFILE(VSAMFILE) COUNT(1). If the file is empty, an RC=04 will be raised.
If the customer worries about exposing delicate file-information from PRINT, specify DD DUMMY for SYSPRINT.
Remember, you're only interested in the return-code.  |
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vasanthz
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Bill Woodger
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| Note that "some" of the nine won't apply for VSAM without changes... |
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murali.andaluri
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Joined: 07 Jun 2013
Posts: 23
Location: USA
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Hi,
I have tried Vasanth first way, but I got RC=16
and
IDC3351I ** VSAM OPEN RETURN CODE IS 160
IDC0005I NUMBER OF RECORDS PROCESSED WAS 0
IDC3003I FUNCTION TERMINATED. CONDITION CODE IS 12
My dataset is empty so it should set RC=0004, but it is showing RC=16. |
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Robert Sample
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Joined: 06 Jun 2008
Posts: 8696
Location: Dubuque, Iowa, USA
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Murali, I am not sure if there is a language barrier or what here.
VSAM distinguishes between an empty file (that is, a VSAM file that has been opened for output before, whether or not there is now a record in it), and an unused file (that is, a VSAM file that has never been opened for output -- ever).
The difference is that an unused file CANNOT be opened for input under any circumstances, while an empty VSAM file can be opened for input. If you have just defined a VSAM file in yoiur JCL, and you attempt to open that VSAM file for input before doing anything else -- that attempt will fail, always and forever. Depending upon which program or utility you are using, you might get a file status code or a 12 / 16 step return code, but in all cases the open will not succeed. |
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Bill Woodger
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| Bill Woodger wrote: |
| Note that "some" of the nine won't apply for VSAM without changes... |
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