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