Implementing Data Guard - Expert Consolidation in Oracle Database 12c - page 362

Note that the observer is started from a host in data center C; none of the databases in the Broker configuration
are located in this data center. The following example is executed from a screen session to allow the observer to
execute even if the session to the database host is lost or disconnected:
[oracle@server3 ~]$ cd ~/tns_admin/
[oracle@server3 tns_admin]$ export TNS_ADMIN=$(pwd)
[oracle@server3 tns_admin]$ dgmgrl /@cdbfsdcb
DGMGRL for Linux: Version 12.1.0.1.0 - 64bit Production
Copyright (c) 2000, 2012, Oracle. All rights reserved.
Welcome to DGMGRL, type "help" for information.
Connected as SYSDBA.
DGMGRL> start observer
Observer started
[blinking cursor-command WILL not return]
After the Observer has been started the warnings in the Broker configuration disappear. You can query the
FSFO configuration in two ways: showing the configuration as demonstrated before or by using the show fast_start
failover command:
DGMGRL> show configuration verbose
Configuration - fsconfig
Protection Mode: MaxAvailability
Databases:
CDBFSDCB - Primary database
CDBFSDCA - (*) Physical standby database
(*) Fast-Start Failover target
Properties:
FastStartFailoverThreshold = '30'
OperationTimeout = '30'
TraceLevel = 'USER'
FastStartFailoverLagLimit = '30'
CommunicationTimeout = '180'
ObserverReconnect = '0'
FastStartFailoverAutoReinstate = 'TRUE'
FastStartFailoverPmyShutdown = 'TRUE'
BystandersFollowRoleChange = 'ALL'
ObserverOverride = 'FALSE'
Fast-Start Failover: ENABLED
Threshold: 30 seconds
Target: CDBFSDCA
Observer: server3.example.com
Lag Limit: 30 seconds (not in use)
Shutdown Primary: TRUE