Clonning the Database

Question

how to clone database (production DB)? please provide me steps to follow

Answer 1

Step 1
The first step is to locate all database files and the init.ora file.
SQL> select name from v$database;
SQL> select name from v$datafile;
Step 2
Create missing folders on new server or location
Step 3
The next step is to copy the database files to the new location. The database you are cloning must be down before you copy any files to ensure the SCN is correct.
Move the init.ora file
Step 4
Change the init.ora to your new name. Change the value to db_name from old name to new name.
Additional parameters you may need to change:
audit_file_dest
background_dump_dest
control_files
core_dump_dest
log_archive_dest
user_dump_dest
Step 5
Issue this SQL command on the old database :
SQL> alter database backup controlfile to trace;
Edit the trace file so it appears as:
STARTUP NOMOUNT
CREATE CONTROLFILE SET DATABASE "NEWNAME" RESETLOGS NOARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 454
LOGFILE
GROUP 1 (
'/u01/app/oracle/oradata/NEWNAME/redo01.log',.....
Save as script and move to the new location.
Note the SET DATABASE in the CREATE CONTROLFILE statement..
Note: The Redo logs don’t appear until the database is opened, but this script creates them.
Step 6
Make sure your new init is in the /dbs folder
Make sure you moved and renamed the password file
Run
SQL> @cr_control.sql
Step 7
Open the NEW database
Before opening the NEW database, you will need to perform incomplete recovery. After recovery you can open the database using the RESETLOGS option as show below:
SQL> alter database recover database until cancel using backup controlfile;
SQL> alter database recover cancel;
SQL> alter database open resetlogs;
Note: The first command produced an error. It wanted archive that did not exist, I also did not move any archive over to the new system.
The second command should be run regardless of the error and it should run without error. If the third command runs without error you probably have a successful clone and your redo logs should be present.
Step 8
Note: I would setup the new database using NETCA before starting this step.
Change the DBID number (make sure the init.ora has remote_login_passwordfile=SHARED)
1. Check the DBID before change
SQL> select dbid , name from v$database ;
2. shutdown immediate;
3. startup mount
startup mount pfile='/u01/app/oracle/admin/NEW/pfile/initNEW.ora'
4. execute NID
nid target=sys/oracle@NEW (oracle should be the sys password)
5. Create a new password file
Rename the old right now if it’s the same name
orapwd file=/u01/app/oracle/product/10.1.0/dbs/orapwNEW password=oracle entries=50
Note: oracle is the sys password
6. startup mount pfile='/u01/app/oracle/admin/NEW/pfile/initNEW.ora'
7. SQL> alter database open resetlogs;
Database altered.
8. check the new DBID
SQL> select dbid,name,open_mode,activation#,created from v$database;
Step 9
Check the new database name.
SQL> select name from v$database;
Step 10
Create a binary init.ora file
SQL> create spfile from pfile='/u01/app/oracle/admin/NEW/pfile/initNEW.ora';
Restart the database