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12c ADG delays the alarm, and when the delay disappears, the alarm disappears automatically. DGMGRL > show configuration;Configuration-dg_config Protection Mode: MaxPerformance Members: orcldg-Primary database orcl-Physical standby database Warning: ORA-16857: standby disconnected from redo source for longer than specified thresholdFast-Start Failover: DISABLEDConfiguration Status:WARNING (status updated 41 seconds ago) DGMGRL > exit$oerr ora 1685716857 0000, "standby disconnected from redo source for longer than specified threshold" / / * Cause: The amount of time the standby was disconnected from the / / redo source database exceeded the value specified by the / / 'TransportDisconnectedThreshold' database property. It is caused by / / no network connectivity between the redo source and the standby / / databases.// * Action: Ensure that there is network connectivity between the redo source// and standby databases, and the redo source is working properly.$dgmgrl / DGMGRL for Linux: Version 12.1.0.2.0-64bit ProductionCopyright (c) 2000, 2013, Oracle. All rights reserved.Welcome to DGMGRL, type "help" for information.Connected as SYSDG.DGMGRL > show configuration;Configuration-dg_config Protection Mode: MaxPerformance Members: orcldg-Primary database orcl-Physical standby database Fast-Start Failover: DISABLEDConfiguration Status:SUCCESS (status updated 20 seconds ago) DGMGRL > description: The Data Guard broker also has configurable database properties that can be used to generate warnings when a transport or apply lag exceed a user defined value:The ApplyLagThreshold configurable database property generates a warning status for a logical or physical standby when the database's apply lag exceeds the value specified by the property. The property value is expressed in seconds. A value of 0 seconds results in no warnings being generated when an apply lag exists. As a best practice, Oracle recommends setting ApplyLagThreshold to at least 15 minutes.The TransportLagThreshold configurable database property can be used to generate a warning status for a logical, physical, or snapshot standby when the database's transport lag exceeds the value specified by the property. The property value is expressed in seconds. A value of 0 seconds results in no warnings being generated when a transport lag exists. As a best practice, Oracle recommends setting TransportLagThreshold to at least 15 minutes.

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