A file in which the prime
blocks are grouped together into interleaves. Each interleave has the
same number of subfiles. The prime blocks of the different interleaves
are interspersed together on DASD. For example, if there are three
interleaves (A, B, C), and each contain four prime blocks, the prime blocks
occur in the sequence: A1, B1, C1; A2, B2, C2; A3, B3,
C3; A4, B4, C4. You can easily increase the number of prime blocks
in each interleave by increasing the file size. You cannot easily
increase the number of interleaves.
intermediate index file
An index file that
is between a top-level index file (highest) and a detail file (lowest).
See also detail file, index file, top-level index
file.
index key
The field in an index logical
record (LREC) that is used to identify the subfile being referenced.
The index key is used as an algorithm argument on TPFDF macros and
functions. See also index LREC.
index LREC
A variable-length or extended
logical record (LREC) that references a subfile in a detail file or an
intermediate index file. See also index key.
index file
A file in an index structure that
contains keys and references to other files. See also detail
file, intermediate index file, top-level index
file.
internal node
Any node that is not a root
node or a leaf node. An internal node only contains pointers to other
nodes.