
Truncation Introduction
13-4 User Reference
Truncation
Any allocated extent that was not completely filled can be truncated so that the unused portion
of the extent is freed. BIM-EPIC performs truncation for controlled datasets by altering both
the VTOC and the DSN Catalog to show only the space actually used. Extents are always
truncated on track or control interval boundaries.
Truncation occurs only on output for sequential disk datasets. It should be inhibited for
TYPEFLE=WORK DTFs and for datasets that are opened as sequential I/O but are not
accessed sequentially (for example, DL/1 datasets). Truncation is automatic for datasets that
you define with DLBL statements. It must be requested using the RLSE subparameter of the
SPACE parameter when using BIM-EPIC DD statements.
Truncation can also be inhibited by the DLBL option “N”.
Description
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