Systems support staff are responsible for the installation, reconfiguration and maintenance of pubsets, including LARGE_OBJECTS pubsets. Tools in the SIR utility (see Installing andextending LARGE_OBJECTS pubsets with SIR) and the pubset management commands (see SET-PUBSET-ATTRIBUTES / SHOW-PUBSET-ATTRIBUTES) are available for this purpose.
A pubset that can accept large objects is known as a LARGE_OBJECTS pubset. Both SF and SM pubsets can possess the LARGE_OBJECTS property. In the case of SM pubsets, LARGE_OBJECTS is a property of the entire pubset, rather than of one or more volume sets.
The maximum size of a LARGE_OBJECTS pubset is 2.147.483.647 PAM pages or 4 TB. This limit is a result of the former field width for counters in the user catalog and for internally maintained counters for disk storage management.
The existence of large files can in certain cases affect the executability of applications (see the section “Executability of utilities in environments with large objects” and Notes regarding programs created in high-level programming languages).
Before a pubset is assigned attributes that allow it to support large files, it should be ensured that the software is configured accordingly. Appropriate measures should therefore be taken in advance to clarify such issues and make any necessary adjustments.