Oracle Solution for Error ora-12832

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

What triggered the Error:

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

What should we do to fix it:

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