Standard Operation Codes - Overview

Standard operation codes contain x"FA" in the most significant byte. The least significant byte indicates the specific operation.

CLOSE	Terminates the processing of a file.
COMMIT	Releases all record locks in all files held by a run unit.
DELETE	Logically removes a record from a file.
DELETE FILE	Physically removes the specified file from the physical devices on which it resides.
OPEN	Initiates the processing of files. It also performs checking and/or writing of labels and other I/O operations.
READ	For sequential access, makes available the next or previous logical record from a file. For random access, makes available a specified record from a disk file.
ROLLBACK	Releases all record locks in all files held by a run unit.
START	Provides a basis for logical positioning in a relative or indexed file, for subsequent retrieval of records.
STEP	Steps to the next physical record.
UNLOCK	Releases all record locks held by a run unit on a named file.
WRITE	Writes a new record to a file.
REWRITE	Replaces an existing record.

Not all operation codes are appropriate with all file organizations. Each operation code description includes a list of the file organizations for which it is valid, using the following key:

L	Line sequential
S	Record sequential (including vS)
R	Relative (including vR)
I	Indexed
vS	Record sequential variable format only
vR	Relative variable format only