Rational Developer for System z
Enterprise COBOL for z/OS, Version 4.1, Programming Guide


Using striped extended-format QSAM data sets

Striped extended-format QSAM data sets can benefit applications that process files that have large amounts of data or in which the time needed for I/O operations significantly affects overall performance.

A striped extended-format QSAM data set is an extended-format QSAM data set that is spread over multiple volumes, thus allowing parallel data access.

For you to gain the maximum benefit from using QSAM striped data sets, z/OS DFSMS needs to be able to allocate the required number of buffers above the 16-MB line. When you develop applications that contain files allocated to QSAM striped data sets, follow these guidelines:

Note that all striped data sets are extended-format data sets, but not all extended-format data sets are striped.

related tasks  
z/OS DFSMS: Using Data Sets

related references  
Allocation of buffers for QSAM files


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