If set to Yes (Enabled), SQLTables() and SQLProcedures() use dbc.tablesX and dbc.databasesX instead of dbc.tables and dbc.databases. Also, SQLColumns() and SQLProcedureColumns() use dbc.columnsX instead of dbc.columns. SqlStatistics() uses dbc.tablesizeX instead of dbc.tablesize. The X tables only contain information that the user has permission to access. These tables are optional for Teradata, so verify that they exist.
If set to No (Disabled), SQLTables() and SQLProcedures() use dbc.tables and dbc.databases. Also, SQLColumns() and SQLProcedureColumns() use dbc.columns. SqlStatistics() uses dbc.tablesize.