A DATA set designates a larger, connected data set, not to confound with a data record of a data base table. In the detail the term has different meanings however depending upon context:

DATA set, IBM large computer

Here DATA set is another name for a file, which exists on a IBM large computer system. A DATA set name (DSN) can be long maximally 44 indications and consists of several Qualifiern (name parts), which are separated by points. Each Qualifier can be long maximally eight places. Example: MEIN.PRIVATES.TEST.DATASET.V1

In application programs usually directly a DATA set one does not access. Instead that is made access by a logical name (also dd name called), which refers dd statements of a job to an appropriate.

For DATA sets different organization forms exist:

• Sequential files: With this file type the data are written and/or read sequentially from file beginning to the file end.
• Direct ACCESS DATA set: The relative address data record by means of Hash from the key is computed.
• Partitioned DATA set (Party of Democratic Socialism and PDSE): A file organisation, with which the DATA set contains a listing with member names, whereby each Member represents again an individual sequential file.
• VSAM organization forms: The operating system component VSAM makes different organization forms available, their most efficient, KSDS (key sequenced DATA set), which key-based to access to the individual data records supported. VSAM organized files are called also VSAM cluster; to the individual VSAM organization forms see the article VSAM.
• ISAM DATA set (Indexed Sequential ACCESS Method): Became outdated organization form, which was replaced practically completely by VSAM. A ISAM DATA set consists of three physical files (PRIME, INDEX and OVERFLOW).
• HFS DATA set: A disk range, which is intended for the admission of Unix files (in Unix terminology one would say: a loop baking file system).

The term of the DATA set is used only for files on the large computer, which was put on under the MVS Personality. Files, which were put on under the Unix system services (i.e. within a HFS Datasets), are not called usually DATA sets.

The meta data (file attributes) of the DATA sets stand partly in the vtoc (with disk memories) or Tape label with magnetic tapes, partly in the Catalog.

Sequential files can be versioniert as generation DATA Groups (GDG).

DATA set, .net

In .net - development environment of Microsoft designates a DATA set one in main storage administered matching data set in tabular structure. Typically the data are picked out with an SQL inquiry from a relational data base or requested by a Web service, worked on then locally in a PC, on a web server or a Application server and back-stored if necessary into the data base. In SOA architecture data changes in the DATA set in a Diffgram are summarized and returned this at the datasupplying Web service.

In addition, a DATA set contains thus i.d.R. first a copy of the data from a certain view on the data base, similarly a Query or a View, serves for of intermediate storage of new or changed data. It is the central scratchpad memory in ASPX or Smart Client applications.

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