Slide 31 of 52
Notes:
Wire protocol is a Query/RecordSet response, usually SQL encapsulated in a proprietary access protocol or a standard such as ODBC..
Note that the spatial data can be stored either in the same database as the attribute data (not shown) or different (shown above). If the fat server is RDBMS then the spatial data may or may not be stored in RDBMS tables - if not, then of course it has to be stored separately.
The critical points to note are (1) no client cache, so every request causes a lot of network traffic if a lot of data has to be returned, (2) a query which examines a lot of data but returns little causes little network traffic because only the query has to be sent.
