VSAM

While working with VSAM datasets you may encounter abends. Following are the common file status codes with their description which will help you to resolve the issues − CodeDescription00Operation completed…

Catalog maintains the unit and volume where dataset resides. Catalog is used for retrieval of datasets. Non-VSAM datasets create a catalog entry by means of Disposition Parameter in JCL. VSAM…

Alternate index are the additional index that are created for KSDS/ESDS datasets in addition to their primary index. An alternate index provides access to records by using more than one…

VSAM commands are used to perform certain operations on VSAM datasets. Following are the most useful VSAM commands − AlterReproListcatExamineVerify Alter ALTER command is used to modify VSAM file attributes.…

LDS is known as Linear Data Set. Linear dataset is the only form of byte-stream dataset which is used in used in traditional operating system files. Linear datasets are rarely…

RRDS is known as Relative Record Data Set. RRDS cluster is similar to an ESDS cluster. The only difference is that RRDS records are accessed by Relative Record Number (RRN), we…

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…

ESDS is known as Entry Sequenced Data Set. An entry-sequenced data set behaves like sequential file organization with some more features included. We can access the records directly and for…

VSAM cluster is defined in JCL. JCL uses IDCAMS utility to create a cluster. IDCAMS is a utility, developed by IBM, for access method services. It is used to primarily define VSAM datasets.…

VSAM consists of following components − VSAM ClusterControl AreaControl Interval VSAM Cluster VSAM are the logical datasets for storing records and are known as clusters. A cluster is an association…