Guide to clone a oracle database

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Guide to clone a Oracle Database

A database cloning procedure is especially useful for the DBA who wants to give his developers a full-sized TEST and DEV instance by cloning the PROD instance intothe development server areas.

This Oracle clone procedure can be use to quickly migrate a system from one UNIX server to another. It clones the Oracle database and this Oracle cloning proceduresis often the fastest way to copy a Oracle database.

STEP 1: On the old system, go into SQL*Plus, sign on as SYSDBA and issue: “alter database backup controlfile to trace”. This will put the createdatabase syntax in the trace file directory. The trace keyword tells oracle to generate a script containing a create controlfile command and store it in the trace directory identified in theuser_dump_dest parameter of the init.ora file. It will look something like this:

STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "OLDLSQ" NORESETLOGS
NOARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 2MAXDATAFILES 240
MAXINSTANCES 1
MAXLOGHISTORY 113
LOGFILE
GROUP 1 ('/u03/oradata/oldlsq/log1a.dbf',
'/u03/oradata/olslsq/log1b.dbf') SIZE 30M,
GROUP 2 ('/u04/oradata/oldlsq/log2a.dbf','/u04/oradata/oldlsq/log2b.dbf') SIZE 30M
DATAFILE
'/u01/oradata/oldlsq/system01.dbf',
'/u01/oradata/oldlsq/mydatabase.dbf'
;
# Recovery is required if any of the datafiles are restored
# backups, or if thelast shutdown was not normal or immediate.
RECOVER DATABASE
# Database can now be opened normally.
ALTER DATABASE OPEN;


STEP 2: Shutdown the old database

STEP 3: Copy all data files intothe new directories on the new server. You may change the file names if you want, but you must edit the controlfile to reflect the new data files names on the new server.

rcp /u01/oradata/oldlsq/*newhost:/u01/oradata/newlsq
rcp /u01/oradata/oldlsq/* newhost:/u01/oradata/newlsq
rcp /u03/oradata/oldlsq/* newhost:/u03/oradata/newlsq
rcp /u04/oradata/oldlsq/* newhost:/u04/oradata/newlsq...
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