Observer is Dbvisit StandbyMP component which is embedded in dbvcontrol and is operatated automatically by starting or stopping dbvctonrol. Purpose of observer is to periodically check primary and standby database, primary and standby server, send notifications and / or initiate Automatic failover.

1. Observer Concept

Observer performs check whether host is alive by checking the dbvagentmanager. If the dbvagentmanager is unreachable, the host is then reported as down by observer. Observer checks the database status through dbvagentmanager.

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• If number of failed checks is exceeded for primary or standby database/server and Observer is set to “Notifications Only”, observer disables any further notifications, but remains checking silently in the background

• If number of failed checks is exceeded for primary database/server and Observer is set to “Perform Automatic Failover”, observer activates standby database, and disables itself for particular configuration

• If number of failed checks is exceeded for standby database/server and Observer is set to “Perform Automatic Failover”, the situation is treated as if Observer is set to “Notifications Only”

2. Observer Configuration

Observer is always enabled separately for each DDC configuration. To configrue the observer, you need to click on “Observer/Auto Failover” in the right ACTIONS pane:

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