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Differences between sequential and ISAM files and usage

 
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ravi1292

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Joined: 22 Sep 2008
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Location: Bangalore

PostPosted: Sun Jul 26, 2009 9:44 am    Post subject: Differences between sequential and ISAM files and usage
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Please let me know what is the difference between sequential file and ISAM file and how they are different in a COBOL program and JCL. Please give me some example where he difference shows the files.
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expat

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Joined: 14 Mar 2007
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Location: Back in jolly old England

PostPosted: Sun Jul 26, 2009 12:12 pm    Post subject:
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Knowing what ISAM means would be a great start for you.
Have you tried google ???
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ravi1292

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PostPosted: Mon Jul 27, 2009 2:07 am    Post subject:
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I searched Google I know what is ISAM file but i want to know how will be the usage in COBOL program and JCL.
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Robert Sample

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PostPosted: Mon Jul 27, 2009 4:50 am    Post subject:
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Precision of terminology is extremely important here -- and you're not very precise yet. Are you using ISAM as a generic term to mean indexed sequential file access, or are you referring specifically to IBM's ISAM implementation? The difference is that IBM no longer supports use of their ISAM implementation so you cannot code up JCL or COBOL to use IBM's ISAM implementation.

If you're referring to ISAM to mean a generic indexed sequential file access, you need to Google VSAM KSDS and find out how the JCL and COBOL statements are used with VSAM KSDS files.

IBM's web site also makes mention of Informix's C-ISAM which IBM does support -- but again that is not the IBM ISAM implementation. And I'm sure a Google search will find you plenty on C-ISAM as well.
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ravi1292

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PostPosted: Fri Jul 31, 2009 11:09 am    Post subject:
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Thank you Robert...
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