Page 1¶

ND 10073 Indexed Sequential Access Method (ISAM)¶

INTRODUCTION¶

ISAM – Indexed Sequential Access Method – is a disk storage and retrieval of data. It may be used from FORTRAN and PLANC. As for COBOL, see «FEATURES».

Records may be retrieved by the aid of an index or in sequential order. ISAM is call-oriented, which means that ISAM services are performed by calling routines from the ISAM library.

The ISAM file is located on two SINTRAN files, the index part on one file, the data part on another.

FEATURES¶

Available in an upgraded version of COBOL’s indexed organized I/O system.
Background oriented system
Record identifier (key) is contained within the record
Total number of keys may be as large as 6. All may have duplicates
Maximum number of records 2²⁴ (i.e. no practical limitation)
Fixed or variable record length
Design is based on the ANSI-74 COBOL standard
May be run in three different modi:
- Single-user buffered input, immediate output
- Single-user buffered I/O
- Multi-user buffered input, immediate output
One of the most advanced and progressive ISAM systems available

PRODUCT DESCRIPTION¶

ISAM consists of 4 modules: - ISAM library (ISAM-LIBRARY) - ISAM service program (ISAM-SERVICE) - ISAM interactive (ISAM-INTER) - ISAM multi-user supervisor (ISAMRT)

The ISAM library contains all ISAM routines. ISAM library is to be loaded together with the user’s application.

The ISAM service program is a user-friendly interactive program including the following service functions: - Verify the consistency of an ISAM file - Unload/load an existing ISAM file - Estimate the size of the index part of the ISAM file - Change multi-user information contained in ISAM multi-user supervisor

The ISAM interactive is a user-friendly program to assist users in the easy manipulation of ISAM files. This means that data can be stored/retrieved interactively without writing special programs. All the ISAM library routines are available.

The ISAM multi-user supervisor is an RT program supervising an ISAM process, i.e. it resolves the currency problems that arise when several programs access the same ISAM files concurrently.

There is no need for logging or reprocessing facilities due to immediate output.

DOCUMENTATION¶

Documentation	Code
ND Indexed Sequential Access Method	ND-60.108

10073-A1-6000-0282

Page 2¶

        ________          _________ 
       |__   __|        |  _______|
          | |  _ __     | |______ 
          | | | '_ \    |  ______|
          | | | | | |   | |____
          |_| |_| |_|   |______|

Norsk Data

Bergen, tel. 05-202090  
Sandnes, tel. 06-645544  
Trondheim, tel. 075-16520, tix. 55580 comte n  
Tromsø, tel. 083-77655  
Stockholm, tel. (08)796450, tix. 15255 nordata s  
Gøteborg, tel. 031-206770  
Malmø, tel. 040-96303  
Copenhagen, tel. 02-477555, tix. 37723 nd dk  
Växsjö, tel. 0472-21544, tix. 11036 ndoxa  
FærøyarNolah, tel. 0241-5688, tix. 12453 nordata færø   
Paris, tel. 60 423434, tix. 017 nd parts  
i.v., tel. 097-378417  
Hovden, tel. 06834 nd well  
Lysaker/Bærum, tel. 029-31485, ruf. 949819 norsk d  
Boston, tel. 617-232-7945, tix. 921470 norsk well  

        ________          _________ 
       |__   __|        |  _______ 
          | |  _ __     | |______
          | | | '_ \    |  ______|
          | | | | | |   | |______
          |_| |_| |_|   |________|

Comtec

Jernkoven 20  
Boks 4 Lindeberg gård  
0409 Oslo  
Tel.: 02-390030  
Tlx.: 18661 nd n  

Stockholm (Upplands Väsby), tel. 0760-84410, tix. 15255 nordata s  
Stockholm (Solunda), tel. 08-778525, tix. 13706 swecom s  
Odense, tel. 19-15414, tix. 53500 comte dk  
Ballerup/Copenhagen, tel. 02-457880   
Düsseldorf, tel. 0211-666188, tix. 8587277 comtd d  

NOTE: NORSK DATA reserves the right to change specifications without notice