NET/MASTER Network Control Language (NCL) Programmer's Guide

Enscribe File Structures and NCL
Working With Files
12–2 106160 Tandem Computers Incorporated
Table 12-1. Verbs and NonStop NET/MASTER MS Commands Used With Files (Page 2 of 2)
Verb or Command Description
SHOW UDB command Displays the status of user databases (UDBs).
SHOW UDBUSER command Displays information about the users and NCL processes that are
currently using user databases (UDB).
UDBCTL file-spec command Associates a user database (UDB) identifier with the name of a file or
the names of a pair of files.
UDBCTL CLOSE command Closes a user database (UDB) or UDB pair.
UDBCTL OPEN command Opens a file or file pair as a user database (UDB) or UDB pair,
respectively.
UDBCTL RESET command Performs a Guardian PURGEDATA operation on a user database
(UDB).
UDBCTL STOP command Dissociates a user database (UDB) identifier from a UDB or UDB
pair.
For the complete syntax of verbs, refer to the NonStop NET/MASTER NCL Reference
Manual. For the complete syntax of NonStop NET/MASTER MS commands, refer to
the NonStop NET/MASTER MS Command Reference Manual.
Note The terms “file” and “UDB” are regarded as synonyms: the term “UDB” is used predominantly in this
section.
Enscribe File
Structures and NCL
Enscribe is a Guardian disk-file access method that is supported on Tandem
computers. NCL works with Enscribe files. This subsection describes the Enscribe file
structures supported by NCL.
Note The following discussion assumes that you are familiar with the Enscribe access method. It concentrates
on discussing the Enscribe access method from the perspective of NCL. Refer to the Enscribe
Programmer's Guide and the Guardian Programmer's Guide for details of the Enscribe access method.
Enscribe File Structures
Supported by NCL
NCL supports two types of structured Enscribe files: entry-sequenced files and
key-sequenced files. In addition, NCL supports edit files (for read-only access) and
communication with Guardian processes. NCL does not support relative files or
unstructured files (except edit files). Table 12-2 summarizes the FILE verbs that you
can use from NCL with the various types of Enscribe files supported by NCL.