A query coordinator handles a multiple-server dynamic performance query by
sending remote query slaves (1) first information for generating a
complete plan for the query, and (2) second information for participating
in the dynamic performance view portion of the query. If the slaves on
the remote servers are unable to use the first information to generate an
equivalent query (for example, if they reside in a database server that
has closed the database), then the slaves on the remote servers use the
second information to participate in the dynamic performance view portion
of the query.