Se> The data dictionary of a DBMS. The SyStem catalogue StoreSmeta-data including the SchemaS of the databaSeS. It iS a mini-databaSe, and iS uSually Stored uSing the DBMS itSelf in Special tableS called {SyStem tableS}. It maybe referred to aS being "on line", aS it iS active, and can be queried by uSerS like any other table. (1999-04-27)