AS/400 Library List

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Most systems have a way to find objects when a specific path is not specified. The same is true of the AS/400 and it uses an object called the library list (*LIBL). This object doesn't exist on its own and is always associated with another object like a job or a job description (*JOBD). As of OS/400 V5R1 the user portion of the Library List can contain up to 250 library names. Prior to that it could only have 25 libraries. (This is something to keep in mind when selling software because on OS/400 V4R5 and below a job description with more than 25 libraries in its library list cannot be restored.)

A job's library list consists of four sections:

As was mentioned above the user portion of the library list for any job can be stored in a job description so that when a job starts up it will use the list specified there. Some job descriptions specify the special value *SYSVAL which means that the library list can be found in the system value QUSRLIBL. The AS/400 Operating System will allow the programmer to delete a library that is in a job description or either of the library list system values provided there are no jobs locking the library. However, all future jobs that use these now tainted lists will fail to start.