Before a server can assume the role of primary server, it must have a quorum, which means that at least one other server must agree that a server can own the database. If the mirror server becomes unavailable while the primary server and arbiter are connected, the primary server continues to provide access to the database. If the primary server loses quorum, it can no longer permit access to the database. At that point, the primary server stops the mirrored database, attempts to restart it, and then waits to regain quorum before making the database available.
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