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AWO
AWO enables APPLY WRITE-ONLY processing for physical sequential files with a variable-blocked (VB) file format.
Enabling AWO can result in fewer calls to Data Management Services to handle I/O. There is no performance change if a program does not use physical sequential variable-blocked files.
If the written record for a physical sequential variable-blocked file is required to be updated on disk as soon as possible, then use NOAWO.
For details on setting the AWO option, refer to the Enterprise COBOL Programming Guide.