A default key that can
only be used to select records. It is not used for add
operations.
read-only path
In an index structure, a path
where the index key is only partially described. There can be more than
one logical record (LREC) in the detail file that matches the index key, so
the path cannot be used to update an index structure. Contrast with
update path.
record ID
Synonym for file
ID.
recoup
A real-time database validation
routine that runs online in an ALCS environment or TPF system. The
primary function of recoup is to identify long-term pool file blocks that are
not in use. The system can then dispense these blocks again. The
TPFDF product includes extensions to TPF and ALCS recoup that allow pool
records in TPFDF files to be identified using database definitions
(DBDEFs).
root
Synonym for root
node.
root block
Synonym for root
node.
root node
The highest level node. If
the root node is the only node in the B+Tree index structure, it
contains pointers to data blocks; otherwise, it contains pointers to
other nodes. Synonymous with root and root
block.
R-type file
A real-time file; that is,
any type of application data file (whether stored in fixed or pool prime
blocks), excluding W-type files.