Your Browser is not longer supported

Please use Google Chrome, Mozilla Firefox or Microsoft Edge to view the page correctly
Loading...

{{viewport.spaceProperty.prod}}

Logical structure of a library

&pagelevel(4)&pagelevel

A library is a file with a substructure. It contains members and a directory.

A member (also referred to as “element” in examples and messages) is a logically related set of data, e.g. a procedure, an object module or a source program. Each member of a library can be referenced individually.

Storing a number of files as members in a library decreases the burden on the file name catalog since each library has only one catalog entry. Storage space is saved because the members are always stored in compressed form in the library. Furthermore, elements may also be stored as delta members, but you need LMS to do so.

Figure 3: Logical structure of a library

Each library has a single entry in the system catalog. The user can define the name and other file attributes such as the retention period or shareability. Catalog entries and changes to them are made by the user with the aid of system commands.