How do I create a VSAM file in Cobol?
Use an entry in the FILE-CONTROL paragraph in the ENVIRONMENT DIVISION to define the file organization and access modes for the VSAM files in your COBOL program. In the FILE SECTION of the DATA DIVISION , code a file description ( FD ) entry for the file.
How do you write a VSAM Ksds file in Cobol?
How to write records into VSAM file. //B19895J JOB COMPILE,’GSS’, // CLASS=X,MSGCLASS=T,NOTIFY=&SYSUID, // TIME=(0001,00) //JOBLIB DD DSN=PC1G0. PDS. GRD1HK.
What are VSAM files?
VSAM or Virtual Storage Access Method is a file storage access method used in MVS, ZOS, and OS/390 operating systems. It was introduced by IBM in 1970’s. It’s a high-performance access method to organize data as files in mainframes. VSAM is used by programming languages in mainframes to store and retrieve data.
What do we call a VSAM Ksds file?
Advertisements. KSDS is known as Key Sequenced Data Set. A key-sequenced data set (KSDS) is more complex than ESDS and RRDS but is more useful and versatile. We must code INDEXED inside the DEFINE CLUSTER command for KSDS datasets.
What is Listcat command?
LISTCAT command in VSAM is used to view the properties of VSAM file like volume details, space details, path details, and catalog details. LISTCAT can list many properties like cluster, data, index, spae details, history, volume and much more. Most used Syntax: LISTCAT ALL ENTRIES(DATASET-NAME)
How does VSAM define keys?
//STEP1 EXEC PGM=IDCAMS //SYSPRINT DD SYSOUT=A //SYSIN DD * DEFINE CLUSTER – (NAME(VWX.MYDATA) – VOLUMES(VSER02) – RECORDS(1000 500)) – DATA – (NAME(VWX.KSDATA) – KEYS(15 0) – RECORDSIZE(250 250) – FREESPACE(20 10) – BUFFERSPACE(25000) ) – INDEX – (NAME(VWX.KSINDEX) – CATALOG (RSTUCAT1) /*