The lowest-level node. It
contains pointers to the data blocks. Synonymous with leaf
and leaf block.
logical record (LREC)
The smallest unit of
data that a TPFDF program normally accesses (reads, adds, or deletes).
An LREC contains several fields, one of which must be the LREC ID. The
TPFDF product supports three types of LRECs: fixed-length,
variable-length, and extended LRECs.
LREC
Logical record.
LREC ID
A 1-byte field identifying the
logical record type. The LREC ID (equated to a value in the file DSECT)
is also called the primary key of the LREC.
LREC keys
The TPFDF product allows searches
for logical records (LRECs) by comparing program-provided search arguments
against specified data fields in the logical record. The search
arguments are called search keys. The data fields in the logical record
are called logical record (LREC) keys.