This graphic shows the nine main OracleAS Guard asgctl command sequences to follow to perform the main OracleAS Disaster Recovery operations. These main operations include creating the topology file (discover topology) and updating the topology file (add instance or remove instance), cloning (clone instance or clone topology), instantiation (instantiate topology), synchronization (sync topology), switchover (switchover topology), and failover (failover). All but one of these main operations start with a connect command to connect the OracleAS Guard client with the OracleAS Guard server where the production Infrastructure database is located followed by identifying the infrastructure database on the primary site (set primary database command); the lone exception is for a failover operation in which a connect command always connects the OracleAS Guard client to the OracleAS Guard server where the standby Infrastructure database is located (remember the production site is unavailable) and then identifying the new Infrastructure database on the secondary site by performing a set new primary database command, which is then followed by the failover operation, then a discover topology operation to create a topology file on this site because one does not exist. All command sequences end with a disconnect command to disconnect the OracleAS Guard client from the OracleAS Guard server.