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KSDS is a short form of Key Sequential Data Set. KSDS is very commonly used dataset among all types of VSAM datasets. KSDS datasets have the most similar features as ISAM and contain DATA and INDEX components. The DATA component has all the data records in a logical ascending order based on the key.
CICS® supports access to the following types of data set: key-sequenced data set (KSDS), entry-sequenced data set (ESDS), and relative record data set (RRDS) (both fixed and variable record lengths). VSAM data sets are held on direct-access storage devices (DASD) auxiliary storage.
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. KSDS cluster consists of following two components −.
22 Ιαν 2017 · This tutorial explains how file operations are performed on ESDS, KSDS, RRDS files of VSAM access method. This tutorial is organized by the following topics. There are three types of file organisation you can use with VSAM. Also referred to as VSAM ESDS (Entry Sequenced Data Set) organisation.
VSAM KSDS datasets require either 7 or 10 bytes of overhead at the end of each CI for control purposes. Also, VSAM permits KSDS data sets to be defined (DEFINE) by using the FSPC=(%CI,%CA) to accommodate future inserts.
Virtual Storage Access Method (VSAM) [1] is an IBM direct-access storage device (DASD) file storage access method, first used in the OS/VS1, OS/VS2 Release 1 (SVS) and Release 2 (MVS) operating systems, later used throughout the Multiple Virtual Storage (MVS) architecture and now in z/OS.
KSDS is abbreviated as Key Sequenced Data Set. A key-sequenced data set (KSDS) is more complex than ESDS and RRDS but is more useful and versatile. When you define KSDS cluster, We must code INDEXED inside the DEFINE CLUSTER command. KSDS cluster consists of following two components.