z/VSE® (disk) files

If the input is a SAM file not managed by VSAM, the BLKSIZE, RECSIZE, and RECFORM values are required (otherwise the default file attributes apply).

In the case of a VSAM-managed SAM file, the file attributes are normally checked for in the VSAM catalog. However, if the attributes are supplied via this statement, the VSAM catalog definitions are ignored.

For native VSAM files (KSDS, ESDS, RRDS, VRDS), the catalog attributes are always used.

For fixed files, the block size, record size, and record format are used for deblocking and memory allocation.

For variable files, the blocksize allocates enough memory to hold a full block, and the record size is not required.

The file attributes for the output update file are determined by the type of update process option that is used (see Process options).