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Showing posts with label QSAM. Show all posts
Showing posts with label QSAM. Show all posts
Monday, 28 July 2014

COBOL File I/O Modes: INPUT, OUTPUT, I-O, and EXTEND

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A batch job often fails before the first business rule runs because the file was opened in the wrong mode. A program that needs to read...

COBOL Disk I/O: How z/OS Reads and Writes Data

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READ CUSTOMER-FILE asks COBOL for one logical record. It does not tell a disk arm to find one sector. On z/OS, the COBOL run time and ...

COBOL Sequential File Organization: READ, WRITE, and EOF

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A daily billing job often reads yesterday's transaction file from top to bottom, totals the amounts, writes a report, and stops whe...
Saturday, 10 August 2013

JCL Spanned Records: RECFM=VBS, LRECL=X, and Safe Usage

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A JCL DD statement with DCB=(RECFM=VBS,LRECL=X) tells z/OS that a logical record may be too large to fit in one physical block. The re...
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