Data set (IBM mainframe): Difference between revisions

Revision as of 18:37, 13 October 2005

Revision as of 18:45, 13 October 2005

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For example, a '''PDS''' or '''Partitioned Data Set''' is a dataset containining multiple ''members'', each of which holds a separate sub-data set, similar to a [[directory]] in other types of [[file system]].

Since MVS/XA there is also the Partitioned DATA set Extended (PDSE).

Since MVS/XA there is also the Partitioned DATA set Extended (PDSE). Here the data in 4K become - blocks administered and free the place become when the deletion Members can be used without Compress immediately. The directory size is completely variable. The introduction of PDSE runs very slowly, there until recently integrity problems existed.

PDS/E file structure is similar to PDS files and is used to store the same types of data. However, PDS/E files have a better directory structure which does not require pre-allocation of directory blocks when the PDS/E is defined (and therefore does not run out of directory blocks if not enough were specified). Also, PDS/E stores members in such a way that no compression is needed to reclaim dead space. PDS/E files can only reside on disk in order to use the directory structure to access individual members. PDS/E files are also referred to as Libraries.

[[Category:Data management]]