Performance system values: Lock libraries in a user job's library search list

The Lock libraries in a user job's library search list system value is also known as QLIBLCKLVL. You can use this system value to prevent other jobs from deleting or renaming the libraries in the search list. System jobs, subsystem monitor jobs, and secondary threads do not lock libraries in their library search list.

Quick reference
Location From IBM® Navigator for i, select Configuration and Service > System Values. Right-click on Performance and click Properties, then select the Library Lists tab.
Special authority All object (*ALLOBJ) and security administrator (*SECADM).
Default value Selected. Lock libraries in a user job's library search list is allowed.
Changes take effect When the next job is started. Active jobs are not changed.
Lockable No.

What can I do with this system value?

You can lock libraries in a user job's library search list (1) to prevent other jobs from deleting or renaming the libraries in the search list. System jobs, subsystem monitor jobs, and secondary threads do not lock libraries in their library search list. Otherwise, the libraries in a user job's library search list are not locked (0).