Although the MQIS database is replicated between sites, different servers own and control different sets of data. The MQIS database on the PEC contains the master copy of the enterprise, site, site link, CN, and user settings, and a master copy of its site's computers and queues. The MQIS database on PSCs contains a master copy of their site's computers and queues.
Each PSC MQIS (including the PEC MQIS) also contains a copy of the MQIS information owned by other sites. Each BSC contains a replicated MQIS database from the PSC (or PEC) in its site. The PSCs and the PEC have write access to the MQIS information they own, and read-only access to all replicated information that they receive from the PEC or other PSCs. Each BSC has read-only access to its replicated MQIS databases.