File Utility Programming (FUP) Reference Manual

Glossary
File Utility Program (FUP) Reference Manual—523323-015
Glossary-3
Disk Process 2 (DP2)
Disk Process 2 (DP2). The portion of the operating system software that performs read,
write, and lock operations on disk volumes. The disk process also implements
Enscribe and SQL/MP file types; creates TMF audit-trail records; performs logical
REDO operations for Remote Duplicate Database Facility (RDF); and manages disk
space, disk controllers, and paths to the disks. This disk process provides enhanced
performance, throughput, recoverability, and reliability improvements in high-volume,
online transaction processing situations.
EBCDIC. An 8-bit coded character set. One of two major codes used to represent and
exchange data. (The other is ASCII.) EBCDIC uses the eighth bit for an information bit,
which extends the range of distinct characters to 256.
EDIT file. An unstructured file containing text that can be processed by either of the editors
for NonStop systems—EDIT or PS Text Edit (TEDIT). An edit file typically contains
either source program code or documentation.
end-of-file (EOF) marker. A marker placed at the end of a file to indicate that the file
contains no additional information.
Enhanced key-sequenced file. A key-sequenced file consisting of 17 to 64 partitions. An
enhanced key-sequenced file may only be a Format 2 file.
Enscribe. The database file-management software provided as part of the Guardian file
system. The Enscribe software provides access to—and manipulation of—records in a
database on a NonStop system. Files on a Guardian system can be either Enscribe
files or SQL/MP tables.
entry-sequenced file. A file in which each new record is stored at the end of the file in
chronological sequence and whose primary key is the system-generated record
address. Records (rows) can be updated but not deleted.
exclusion mode. A specification that determines the degree of access that competing
processes can have to a file simultaneously (shared access, exclusive access, or
protected access). Exclusion mode is specified when the file is opened.
extent. Either a contiguous area on disk for allocating one file, or a block of physical storage
for allocating files.
extent sizes. The size in bytes of a contiguous area on disk for allocating one file.
external name. The file name known and used by applications. For logically named SMF
files, it is the logical name. For direct files, it is the direct name.
file partitioning. The action of subdividing a large file into smaller units that can be handled
more effectively.
file set. A file or a set of files that can be specified (optionally) with the wild-card option to
define name patterns. The file or file set can usually be qualified with an additional set
of exclusions.