If I have standby which is db role is PHYSICAL STANDBY and it is MOUNTED. So, when I open it read/write the standby will be destroyed. (I have DataGuard)

So, basically do I need to mount it again and start the recover process to fix it or does this envolve more steps?

1 Answer 1


It is not possible to do that with recovery only. The standby database that was opened in read/write mode must be flashed backed to a point before it was opened.

This concept is called "snapshot standby".

Managing a Snapshot Standby Database

A snapshot standby database is a fully updatable standby database. It receives and archives redo data from a primary database, but does not apply it.

Redo data received from the primary database is applied when a snapshot standby database is converted back into a physical standby database, after discarding all local updates to the snapshot standby database.


Flashback Database is used to convert a snapshot standby database back into a physical standby database. Any operation that cannot be reversed using Flashback Database technology prevents a snapshot standby from being converted back to a physical standby.

More details can be found in the documentation referenced above.

With broker:

Converting a Physical Standby to a Snapshot Standby

  • so basically only few commands, will restore my database to functional standby db again?
    – paganini
    Feb 19 at 15:34
  • @paganini Anything can be done with only a few commands that are wrappers for additional steps, but yes, that is the point of this. Feb 19 at 16:20
  • thanks for the info, I have 1 more additional questions, lets suppouse I have windows server which is my standby. Can I use configure the database to startup immediatly or do I need a small script which would start after every windows restart?
    – paganini
    Feb 19 at 19:35

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