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| Allocating External Files |
Allocating Nonstandard External Files
| Allocating ISAM Files |
To allocate a new ISAM file, you must use either a JCL DD statement or the TSO ALLOCATE command; you cannot use the FILENAME statement or FILENAME function. However, you can use the FILENAME statement or function to allocate an existing ISAM file.
| Allocating UNIX System Services Files |
See Accessing UNIX System Services Files for details.
| Allocating PDSEs |
To allocate a partitioned data set extended (PDSE), specify the appropriate options in the FILENAME statement or FILENAME function, as shown in the example in FILENAME Statement Examples.
See Options That Specify SMS Keywords for definitions of SMS options.
You can use a PDSE wherever you can use a PDS, and you can write to multiple members in a PDSE at the same time.
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