Within a multi-node site, one instance of the Qlik Sense Repository Service (QRS) runs on each node. The QRS running on the central node is considered to be the master. The master QRS has direct access to the central repository database, whereas other QRSs only have access to a local repository database on the node where they are running. The master QRS synchronizes the central repository database and the local repository databases. For information on the synchronization procedure, see Synchronization.
When the master QRS starts, it connects to the repository database on the central node. If no database exists, the master QRS builds the database and populates it with initial data. In a default Qlik Sense installation, the repository database is a specific instance of PostgreSQL that runs its own database cluster specifically for the repository.
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