The SQL database is essential for optimal operations. If the SQL database is lost all roles become unavailable. You can distribute your SQL database by installing it independent of Security Center to prevent data loss.
For more details on database failover, see SQL Server deployment option: failover.
For details, see the "Configuring SQL Server for the cluster" topic in the relevant Installation and Upgrade Guides for NEC Cluster and Windows Cluster.
For information on SQL Server permissions, see Assigning SQL permissions on remote SQL Servers.