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Functions NOT supported in COBOL

 
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Sukhmeet Singh

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Joined: 28 Dec 2007
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Location: kolkata

PostPosted: Fri May 23, 2008 4:04 pm    Post subject: Functions NOT supported in COBOL
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Which of the following is/are not supported by COBOL?

RBA addressing, Skip-sequential or replacing existing record.
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mmwife

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Joined: 30 May 2003
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PostPosted: Fri May 23, 2008 8:16 pm    Post subject:
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RBA addressing and Skip sequential are only supported in CICS. I guess that's what he's getting at.
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CICS Guy

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PostPosted: Fri May 23, 2008 8:36 pm    Post subject: Re: Functions NOT supported in COBOL
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The following are all out of the Enterprise COBOL for z/OS Programming Guide
hitler26 wrote:
RBA addressing

Use the RELATIVE KEY IS clause to associate each logical record with its relative record number.
Quote:
Skip-sequential

With dynamic access, you can switch between reading a specific record directly and reading records sequentially, by using READ NEXT for sequential retrieval and READ for random retrieval (by key).
Quote:
replacing existing record

Updating records in a VSAM file
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mmwife

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PostPosted: Sat May 24, 2008 12:16 am    Post subject:
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The 1st source you cited is for a relative RECORD read. CICS allows a relative BYTE address read. It gives the CICS coder the ability to access an ESDS rec randomly.

The 2nd is not the same as a "skip sequential" read. In CICS the RIDFLD of the read stmt allows the the key to be skipped for the next read without changing modes or the read stmt; just move the new key to the RIDFLD before the next exec of the read. They say that a performance improvement results provided the gaps in the skips are reasonably small.
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