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iStrobe Online Help

IGZEVIO

IGZEVIO is a COBOL routine that handles all requests for START, READ, REWRITE, WRITE, and DELETE verbs with VSAM files.

Hints

If your program is waiting in the IGZEVIO module, it might indicate that a VSAM file is inefficiently buffered. The default for VSAM buffers is 2 for the data portion and 1 for the index portion. Having only one index buffer can cause a significant amount of wait time, especially for a randomly accessed file.

If the file is randomly accessed, you can increase the index buffers. If the file is sequentially accessed, check the data buffers to determine if they need to be modified.

Reference Sources

VS COBOL II, Installation and Customization for MVS, Release 3.2, SC26-4048.