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　　Description
　　Need to create a duplicate database on the same machine ? Database too big to use Export/Import ?
　　This is the easiest way to do it.
　　
　　Assume the original database is called PROD1 and you want to create a CLONE1 duplicate database.
　　
　　Procedure
　　- Find some disk space and create appropriate directories / file systems for you cloned database (conforming to the OFA guidelines)
　　
　　- Connect to the PROD1 instance and dump the controlfile using the SQL command
　　
　　ALTER DATABASE BACKUP CONTROLFILE TO TRACE;
　　
　　This will put a text copy of the controlfile in the USER_DUMP_DEST
　　
　　- Shutdown Normal PROD1 database
　　
　　- Perform an operating system copy of PROD1 to the new location where CLONE1 will reside.
　　
　　- Startup the PROD1 instance
　　
　　- Edit the controlfile you created and change all the path names of the database to the new location.
　　
　　- Set your environment to the CLONE1 instance and run Server Manager (svrmgrl)
　　
　　CONNECT INTERNAL
　　STARTUP NOMOUNT
　　
　　CREATE CONTROLFILE REUSE SET DATABASE "CLONE1" RESETLOGS NOARCHIVELOG
　　MAXLOGFILES 32
　　MAXLOGMEMBERS 2
　　MAXDATAFILES 64
　　MAXINSTANCES 8
　　MAXLOGHISTORY 800
　　LOGFILE
　　GROUP 1 '/oracle/data/CLONE1/redos/log1CLONE1.dbf' SIZE 512K,
　　GROUP 2 '/oracle/data/CLONE1/redos/log2CLONE1.dbf' SIZE 512K,
　　GROUP 3 '/oracle/data/CLONE1/redos/log3CLONE1.dbf' SIZE 512K
　　DATAFILE
　　'/oracle/data/CLONE1/system_ts/systCLONE1.dbf' SIZE 25M,
　　'/oracle/data/CLONE1/data_ts/data_CLONE1.dbf' SIZE 230M,
　　'/oracle/data/CLONE1/index_ts/index_CLONE1.dbf' SIZE 230M,
　　'/oracle/data/CLONE1/rbs_ts/rbs_CLONE1.dbf' SIZE 10M,
　　'/oracle/data/CLONE1/temp_ts/temp_CLONE1.dbf' SIZE 10M,
　　'/oracle/data/CLONE1/tools_ts/ts_tools_CLONE1_02.dbf' SIZE 15M,
　　'/oracle/data/CLONE1/users_ts/ts_users_CLONE1.dbf' SIZE 1M,
　　;
　　
　　ALTER DATABASE OPEN RESETLOGS;
　　
　　- That's it, an exact duplicate of PROD1 and a painless procedure.