bdfm1m14Messages (System Error, Online, Offline) and Master Glossary

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interleaved file
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.