USING ‘DELAY’ OPTION TO PROTECT LOGICAL/PHYSICAL CORRUPTIONS

You may utilize the delay option (if you have multiple standby sites) to prevent physical/logical corruption of your primary. For instance, your standby #1 may not have ‘Delay’ on to be your disaster recovery standby database. However, you may opt to implement a delay of minutes or hours on your standby #2 to allow recover from a possible physical or logical corruption on your primary database.
SQL> alter database recover managed standby database delay 5 disconnect;

http://www.pafumi.net/Standby_Concepts_Configuration.html

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