Oracle Data Guard 11gR2 Administration Beginner's Guide

Time for action – using interfaces to monitor Data Guard

1. At the first step we will use SQL*Plus to gather information from Data Guard and monitor its status. The connection to the standby database must be from the standby database server with password file authentication if the standby database is on mount mode and so not accessible from outside. If Active Data Guard is enabled, it's also possible to connect a standby database remotely. Let's connect to the standby database and gather the main Data Guard configuration information:

   $sqlplus / as sysdba
   SQL> select database_role,open_mode,protection_mode from v$database;
   
   DATABASE_ROLE      OPEN_MODE             PROTECTION_MODE
   ----------------   --------------------  --------------------
   PHYSICAL STANDBY READ ONLY WITH ...