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Mainframe Interview Questions 1
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Defining VSAM (128 views)
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1. INTRODUCTION TO VSAM
10. COBOL VSAM Considerations
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VSAM Catalogs - VSAM Catalogs In this Mainframe tutorial, you will learn about VSAM Catalogs, Master Catalog, User Catalog and Data Space of VSAM. VSAM Catalogs
VSAM Control Interval And Control Area - VSAM Control Interval and Control Area In this Mainframe tutorial, you will learn about VSAM Control Interval, What is a Control Interval in VSAM? and Control Area, what is VSAM control area, attributes in the control area index component. VSAM Control Interval and Control Area
VSAM Introduction - VSAM Introduction In this Mainframe tutorial, you will learn about VSAM, what is VSAM, VSAM structure, types of VSAM datasets, Entry Sequenced Data Set (ESDS), Key Sequenced Data Set (KSDS), Linear Data Set (LDS) and Relative Record Data Set (RRDS). VSAM Introduction
VSAM Structure - VSAM Structure In this Mainframe tutorial, you will learn about VSAM Structure, four major areas of VSAM structure, what is VSAM cluster, VSAM components, Defining VSAM cluster and Example for defining VSAM clusters. VSAM Structure
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MOTCLE ABBREVIATION DESCRIPTION
CA (1) See channel adapter (2) See control area (3) See change accumulation (4) See certificate authority
CI (1) See control interval (2) See callable interface (3) See configuration item
CI See control interval
control area CA (1) See control block (2) In the Virtual Storage Access Method (VSAM), a group of control intervals used as a unit for formatting a data set before adding records to it. In a key-sequenced data set (KSDS), each CA is pointed to by a sequence-set index record, and used by VSAM for distributing free space and for placing a sequence-set index record adjacent to its data. See also control block
control area CA groupe de CIs constituant un fichier VSAM
control interval CI (1) A fixed-length area of direct access storage in which VSAM stores records and creates distributed free space. The control interval is the unit of information that VSAM transmits to or from direct access storage. A control interval always includes an integral number of physical records (2) In a key-sequenced data set or file, the set of records that an entry in the sequence-set index record points to
control interval CI 1. A fixed-length area of direct access storage in which VSAM stores records and creates distributed free space. The control interval is the unit of information that VSAM transmits to or from direct access storage. A control interval always includes an integral number of physical records 2. In a key-sequenced data set or file, the set of records that an entry in the sequence-set index record points to
control interval CI A fixed-length area or disk in which VSAM stores records and creates distributed free space. Also, in a key-sequenced data set or file, the set of records that an entry in the sequence-set index record points to. The control interval is the unit of information that VSAM transmits to or from disk. A control interval always includes an integral number of physical records
control interval CI unit? de transfert et de stockage pour les enregistrements des fichiers VSAM
control interval CI
  • A unit of information that VSAM transfers between virtual and auxiliary storage.
  • In a key-sequenced data set or file, the set of records that an entry in the sequence-set index record points to.
entry-sequenced data set ESDS (1) A VSAM data set whose records are physically in the same order in which they were put in the data set. A VSAM data set is processed by using addressed direct access or addressed sequential access and has no index. New records are added at the end of the data set (2) A data set whose records are loaded without respect to their contents, and whose relative byte addresses cannot change. Records are retrieved and stored by addressed access, and new records are added at the end of the data set
entry-sequenced data set ESDS organisation s?quentielle des fichiers VSAM
ESDS See entry-sequenced data set
ESDS Entry Sequenced DataSet. VSAM sequential dataset in which the data is held in the order in which it was originally entered (i.e., new records are placed on the end of the dataset). Can be used as a replacement for BSAM and QSAM in z/OS. But most commonly used as a replacement for sequential datasets in VSE/ESA. See also Linear dataset.
key sequenced data set KSDS fichier VSAM ? acc?s direct, par cl?
key-sequenced data set KSDS A VSAM file or data set whose records are loaded in key sequence and controlled by an index
key-sequenced data set KSDS A VSAM file or data set whose records are loaded in ascending key sequence and controlled by an index. Records are retrieved and stored by keyed access or by addressed access, and new records are inserted in key sequence by means of distributed free space. Relative byte addresses can change because of control interval or control area splits
Keyed Sequential Data Set KSDS This is a type of VSAM (Virtual Sequential Access Method) data set. Records are in collating sequence by a key field and alternate indexes are allowed.?Note:> >If the key field is alpha-numeric the collating sequence will be different between the EBCDIC-encoded and ASCII-encoded environments.?> For additional information refer to VSAM definition in this glossary or http://www.simotime.com/indexsam.htm>
KSDS key-sequenced data set
KSDS Key Sequenced DataSet. One of type of VSAM dataset (file) in which the logical records are placed in sequence of a key which is held as part of each record (e.g., invoice number). Usually, each key is unique and is located in the same place in the record. Replaces ISAM.
KSDS See key-sequenced data set
non-VSAM data set A data set allocated and accessed using one of the following methods: basic direct access method (BDAM), basic partitioned access method (BPAM), basic indexed sequential access method (BISAM), basic sequential access method (BSAM), queued sequential access method (QSAM), or queued indexed sequential access method (QISAM)
non-VSAM entry A catalog entry that describes a data set that does not use the Virtual Storage Access Method (VSAM). A non-VSAM entry contains the data set's volume serial number (VOLSER) and device type. If the data set resides on a magnetic tape volume, the entry can also identify the data set's file number. When the data set resides on a direct access device, the operating system obtains further information by examining the data set's data set control block (DSCB) in the volume's volume table of contents (VTOC)
QISAM Queued Index Sequential Access Method. Obsolete System/360 access method replaced by VSAM KSDS.
relative record data set RRDS A type of Virtual Storage Access Method (VSAM) data set whose records have fixed or variable lengths, and are accessed by relative record number
relative record data set RRDS fichier VSAM pour lequel les enregistrements sont accessibles par num?ro d'ordre
RRDS See relative record data set
RRDS Relative Record DataSet. VSAM file type ? can be used as a replacement for BDAM. Each record can be accessed directly by its record number.
Virtual Sequential Access Method VSAM A data access method used with IBM Mainframes running MVS, OS/390, z/OS and VSE/ESA operating systems. VSAM has been in use for over 30 years. The original VSAM had a 4-gigabyte limit for the size of data sets. IBM has enhanced VSAM to support record-level sharing and file sizes larger than 4 gigabytes. The current architectural limit varies according to the size of the data control intervals (CI's). For a 512-byte CI size, the maximum size is 2 terabytes for a KSDS with a CI size of 32 kilobytes, the maximum size is 128 terabytes. For additional information about VSAM refer to http://www.simotime.com/indexsam.htm>
Virtual Storage Access Method VSAM An access method for direct or sequential processing of fixed-length and variable-length records on disk devices. The records in a VSAM data set or file can be organized in logical sequence by a key field (key sequence), in the physical sequence in which they are written on the data set or file (entry sequence), or by relative-record number
virtual storage access method VSAM m?thode d'acc?s des syst?mes IBM 370
Virtual Storage Access Method VSAM An access method for direct or sequential processing of fixed- and varying-length records on disk devices
virtual storage access method VSAM An access method for direct or sequential processing of fixed and variable-length records on direct access devices. The records in a VSAM data set or file can be organized in logical sequence by a key field (key sequence), in the physical sequence in which they are written on the data set or file (entry-sequence), or by relative-record number
VSAM virtual storage access method
VSAM Virtual Storage Access Method (aka Very Slow And Mysterious). IBM mainframe proprietary software for direct (by key or by record number) or sequential processing of fixed and variable length records on DASD. According to IBM, VSAM gives device independence of data storage and eases migration of data to new devices. VSAM is a very powerful system if it had record locking it would almost be a database. However, according to the third-party vendors who make a living selling VSAM software, VSAM software (notably IDCAMS) is a pig to use, and users need all the help they can get. See also KSDS, RRDS, ESDS.
VSAM See Virtual Storage Access Method
VSAM catalog A special key-sequenced data set (KSDS) with an index containing extensive data set and volume information that the Virtual Storage Access Method (VSAM) requires to locate data sets or files, allocate and deallocate storage space, verify the authorization of a program or operator to gain access to a file, and accumulate usage statistics for data sets or files. VSAM catalogs have been functionally replaced by integrated catalog facility (ICF) catalogs. VSAM catalogs are not supported by z/OS
VSAM record-level sharing VSAM RLS An extension to the Virtual Storage Access Method (VSAM) that provides direct record-level sharing of VSAM data sets from multiple address spaces across multiple systems. Record-level sharing uses the z/OS Coupling Facility (CF) to provide cross-system locking, local buffer invalidation, and cross-system data caching. Contrast with global shared resources and local shared resources. See also SMSVSAM, global shared resource, local shared resource