Allocating the input area data set

For an offline extract, or when extracting data from an image copy, the area data set can be supplied in the JCL or can be accessed using dynamic allocation. The areaname DD statement identifies the area data set to input to the extract function. The areaname DD statement can specify an image copy data set. If the areaname DD statement is omitted from the JCL, Fast Path Reorg/EP tries to dynamically allocate it.

The IMSACB DD statement identifies the ACB library containing the database definition that describes the area referenced by the areaname DD statement.

If you are using dynamic allocation, do not include the areaname DD statement. Fast Path Analyzer/EP tries to obtain the data set name for allocation in the following order:

If the INPUT_DSN_MASK keyword is specified, it is used to generate the data set name. The data set name can specify an image copy.
If DBRC is active and the area is registered, the registered area data set name is obtained from DBRC.
The STEPLIB is searched for the DFSMDA member that contains the data set name for this area.
If DBRC is active, the area is registered with DBRC, and the data set to be read is not an image copy, the allocated data set name must match the registered data set name regardless of how it is allocated.
The following figure shows an example using the INPUT_DSN_MASK keyword to generate the data set name for the extract. Specifying this keyword allocates VSAM area data set or image copy data set to be used as input to the extract.
```
EXTRACT DBD=PFPDBD1
   INPUT_DSN_MASK='PFP.&AREA'
```

Related topic

Extracting data from a DEDB

Allocating the input area data set

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