hmm, got some answer via oracle docs but still have questions. Here's What I think large pool is in regards to MTS, it's used to cache processes sort area which are connected as shared server processes. shared pool are shared sql area and pl/sql.

as for as configuration,
mts_session is ratio of dispatcher to no. of connection.

still don't know diff between:
mts_dispatcher and mts_server. What function does mts_server servererd?