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SQL*Plus: Release 10.2.0.4.0 - Production on Thu Feb 25 19:23:35 2010
Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
SQL> desc v$datafile;
SP2-0640: Not connected
SP2-0641: "DESCRIBE" requires connection to server
SQL> conn / as sysdba
Connected.
SQL> desc v$datafile;
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 FILE#                                              NUMBER
 CREATION_CHANGE#                                   NUMBER
 CREATION_TIME                                      DATE
 TS#                                                NUMBER
 RFILE#                                    &


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