How do Library Lists help the IBM i System locate objects?

The IBM i System uses library lists to determine where a job can find the objects it needs. Each job on the system has a library list attached to it.

Library lists contain different types of libraries.

  • System libraries contain objects provided by IBM.
  • Product libraries are automatically added when IBM products are installed.
  • Current libraries are specific to an individual user ID and serve as the default library for that user.
  • User libraries are created by the organisation to store and organise their own programs, files and other objects.

Qualified names offer another method for finding objects on the AS/400. A qualified name specifies both the library and the object name, separated by a forward slash, like this: "NICKLIB/NICKPGM".

Normally, we rely on the library list structure to reference objects, but you might use a qualified name in the following situations:

  • The object is located in more than one library included in your library list.
  • The object is not present in any library within your library list.
  • You lack authority to access the object but wish to confirm its existence.

It's important to note that library descriptions, device descriptions and user profiles are stored in the QSYS library. All other object types can be stored in any library.

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