solidDB Help : Configuring and administering : Configuring and administering HotStandby : HotStandby administration tasks : Verifying HotStandby server states : Server state combinations
  
Server state combinations
All combinations of server states are not valid. For example, if the primary server is in PRIMARY ACTIVE state, the secondary server must be in SECONDARY ACTIVE state.
The following table shows the valid states that a HotStandby server might have when the other server in the HSB pair is in a particular state.
 
State of the server
Possible states of the associated server
PRIMARY ACTIVE
SECONDARY ACTIVE
PRIMARY ALONE
PRIMARY ALONE *
PRIMARY UNCERTAIN
SECONDARY ALONE
STANDALONE *
PRIMARY UNCERTAIN
PRIMARY ALONE
PRIMARY UNCERTAIN
SECONDARY ALONE
STANDALONE
SECONDARY ACTIVE
PRIMARY ACTIVE
SECONDARY ALONE
PRIMARY ALONE
PRIMARY UNCERTAIN
SECONDARY ALONE
STANDALONE
STANDALONE
PRIMARY ALONE *
PRIMARY UNCERTAIN
SECONDARY ALONE
STANDALONE *
* If one server is in the PRIMARY ALONE state or STANDALONE state, the other server cannot be in the PRIMARY ALONE or STANDALONE state. This is because if changes are made to both servers independently, there is no way to merge the two databases into one.
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Verifying HotStandby server states