Error while Duplicating the Database

Question

Hi All;
I am trying to duplicate a database and when run this command I get the below error....
RMAN> duplicate target database to rmdupl1 nofilenamecheck;
Starting Duplicate Db at 26-NOV-07
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: sid=11 devtype=DISK
printing stored script: Memory Script
set until scn 53262;
set newname for datafile 1 to
"C:\ORACLE\ADMIN\PROD\DATAFILE\SYSTEM01.DBF";
set newname for datafile 2 to
"C:\ORACLE\ADMIN\PROD\DATAFILE\UNDOTBS.DBF";
restore
check readonly
clone database
executing script: Memory Script
executing command: SET until clause
executing command: SET NEWNAME
executing command: SET NEWNAME
Starting restore at 26-NOV-07
using channel ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: starting datafile backupset restore
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
restoring datafile 00001 to C:\ORACLE\ADMIN\PROD\DATAFILE\SYSTEM01.DBF
restoring datafile 00002 to C:\ORACLE\ADMIN\PROD\DATAFILE\UNDOTBS.DBF
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 11/26/2007 07:09:44
RMAN-03015: error occurred in stored script Memory Script
ORA-19504: failed to create file "C:\ORACLE\ADMIN\PROD\DATAFILE\SYSTEM01.DBF"
ORA-27086: skgfglk: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
RMAN>

Answer 1

I think Peter is right. You are probably erroneously attempting to overwrite the original, source database.
See: rman duplicate command fails?
Virtually the same error message!