Oracle Error ORA-12832: Could not allocate slaves on all specified instances

Oracle Error Message

ORA-12832: Could not allocate slaves on all specified instances

Reason for the Error

After executing a query on a global v$ fixed view, one or more instances failed to allocate a slave to process query

Solution

To allow results to be returned by sucessfully allocated slaves, execute ALTER SESSION SET ALLOW_PARTIAL_SN_RESULTS=TRUE statement, or check parameters of instances