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Understanding transaction processing and online application development.

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OPEN , READ , WRITE , REWRITE , and CLOSE operations for sequential and indexed files. mainframe refresher by muthu pdf link

Integrating SQL statements within COBOL programs using EXEC SQL and END-EXEC . mainframe refresher by muthu pdf link

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The DISP parameter governs the status of a data set using a three-field syntax: DISP=(status, normal-termination, abnormal-termination) .