indexed file organization in cobol

Describes the organization of Indexed files. An indexed file is implemented as two separate files; the data file and the key file. program-id. 05 ID-NO-KEY PIC 9(5). index1. The indexes that makes this possible is maintained by the runtime system, so the programmer only have to declare the file and supply the data. code for program which create the index file in cobol identification division. Specifying indexed organization for VSAM files Enterprise COBOL for z/OS, Version 4.2, Programming Guide Identify a VSAM KSDS file in a COBOL program by using the ORGANIZATION IS INDEXED … When indexed files are read or written sequentially, the sequence is that of the key values. Learn Syntax and Examples of COBOL Files. data division. An index-sequential file in COBOL can briefly be described as a file with at least one key concept. THE INDEXED FILE ORGANIZATION. As well as a primary key, indexed files can contain one or more additional keys known as alternate keys. FILE SECTION. Indexed file records can also be accessed sequentially. FD INDEXED-FILE... 01 INDEXED-RECORD. Variable length records are handled by the variable length file handler supplied with this COBOL system. Again note that the record key and alternate keys must be defined in the file section. When the access mode is RANDOM, the method of record retrieval changes as per the selected file organization. This COBOL system supports three file organizations: sequential, relative and indexed. 2.1.1 Sequential Files A sequential file is one in which the individual records can only be accessed sequentially, that is, in the same order as they were originally written to the file. DATA DIVISION. Shows how records may be added, deleted or updated and describes how records in an Indexed file may be processed directly or sequentially on any key. The COBOL language supports indexed files with the following command in the FILE CONTROL section ORGANIZATION IS INDEXED IBM PL/I uses the file attribute ENVIRONMENT(INDEXED) or ENVIRONMENT(VSAM) to declare an indexed file. COBOL File Handling supports 3 types of files i.e Sequential File,Indexed File, and Relative organization File. FILE-CONTROL. The value of a record's alternate key(s) does not have to be unique. file section. environment division. In this file organization, the records of the file are stored one after another in the order they are added to the file. It seems that I left out some fields that were in the indexed file because they were not needed in this part of the program. SELECT INDEXED-FILE ASSIGN TO C:\COBOL\INDEXED.DAT" ORGANIZATION IS INDEXED ACCESS IS SEQUENTIAL RECORD KEY IS ID-N0-KEY. A key can be used to establish unique information and to retrieve the data in an ordered way. SELECT PO-MASTER-FILE ASSIGN TO 'PO-INDEXED.DAT' ORGANIZATION IS INDEXED ACCESS IS RANDOM RECORD KEY IS PO-KEY FILE STATUS IS FILE-STATUS-CODE. Comparison of COBOL file organizations Summarizes the advantages and disadvantages of each of the file organizations above. select indfile1 assign to disk organization is indexed access mode is random record key is fno. INPUT-OUTPUT SECTION. input-output section. file-control. To define a file as indexed, specify ORGANIZATION IS INDEXED in the SELECT clause for the file in your COBOL program. SELECT file-name ASSIGN TO dd-name ORGANIZATION IS RELATIVE ACCESS MODE IS SEQUENTIAL RELATIVE KEY IS rec-key1 Random Access. EBCDIC consideration: As with any change in the collating sequence, if your indexed file is a local EBCDIC file, the EBCDIC keys will not be recognized as such outside of your COBOL program. 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