bdfm1m1bMessages (System Error, Online, Offline) and Master Glossary

R

read-only default key
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.