High Availability Data Guard, Sharding and Global Data Services (MOSC)

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observer failover condition

edited Dec 11, 2009 5:36AM in High Availability Data Guard, Sharding and Global Data Services (MOSC) 1 commentAnswered
With Oracle DATAGUARD 10gr2, it is said that the observer can initiate a failover when 

one of these conditions occurs:

1. Network isolation of primary, but standby and observer can commnicate and standby is synchronized.

2. primary Instance shooted

3. Automatic datafile offline initiated by the database

My question is :

In which condition the database can bring offline one datafile ?

Is there any (hidden) parameter or circunstance that can influence this behavior ?

Thanks

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