How do I take the hot backup, cold backup and RMAN backup on Linux and Windows servers? Please tell me the exact steps.

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The nice thing about RMAN is that you do not need different steps for different platforms. A hot backup is as simple (in Oracle 9i and above) as running the following command in RMAN: 

backup database;

The above command assumes that you have configured default channels with the CONFIGURE command. To perform a cold backup, you will want to shut down the database, back it up and then start the database. My old RMAN script to perform a cold backup looks like the following: 

run {
shutdown immediate
startup mount
allocate channel t1 type 'SBT_TAPE'
backup full format "%d_FULL_%U" (database) ; 
sql 'alter database open'; release channel t1; }

In the above, I shut down the database and start it in MOUNT mode. I then allocate a channel and back up the database. Once done, I open the database and release the channel.

My script was originally written for Oracle 8i and I have not used it since that version. Oracle 9i and 10g have newer options (such as specifying default channels) so your script may look a little different.

This was first published in September 2005

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