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Cloning Oracle database using expdp/impdp

Posted on 2013-01-09
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How do I clone Oracle database using expdp/impdp?

What is the difference between clonign database and exporting it when using expdp/impdp?
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Question by:YZlat
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slightwv (䄆 Netminder) earned 250 total points
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>>How do I clone Oracle database using expdp/impdp?

This really isn't a clone.  You export the schemas from databaseA, create databaseB and import the schemas into it.

>>What is the difference between clonign database and exporting it when using expdp/impdp?

A clone is an EXACT copy of the database.  This is done by copying data files.

export/import extracts the DDL for the objects and the data associated with those objects.  When imported back in, there is a lot of I/O and processing to recreate the objects and load the data (and rebuild any indexes/constriants you had).
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by:YZlat
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so lets say I need to clone my database from production to developemnt server. What's the best way to do that?
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by:slightwv (䄆 Netminder)
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There really isn't a 'best' way.  It all depends on the specific databases in question and the requirements.

If the database/schemas in question are relativly small, I would probably go with export/import.

The larger the database and amount of data, the less attractive this option.

If you clone, you will have to change the database name.  You probably don't want a development database with the same name as a production database even if they are on different servers.

Changing the name isn't a big deal.  Just one more thing you have to do with a clone.
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Can you post step by step instructions on cloning the database? I am new to this, so I need some guidance
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by:slightwv (䄆 Netminder)
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There are tons of links out there on cloning a database using RMAN if you look around.  Many of them have the steps posted better than I can provide here.

Here's the online doc links for it:
http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta020.htm#RCMRF126
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by:Steve Wales
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There's an interesting article at the Pythian site that talks about a quick and easy restore if you have an existing RMAN database backup and controlfile backup.

I played with it on a test server and it worked remarkably well.

http://www.pythian.com/library/papers_and_books/the_quick_and_easy_rman_restore/

However, I'd be inclined to stick with the Oracle Documentation and trying to understand how it works step by step before trying to take any shortcuts.
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by:YZlat
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is RMAN installed separately or is it a part of a standard Oracle installation?
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So cloning the database is the same as restoring database from a backup, is it?
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>>is RMAN installed separately or is it a part of a standard Oracle installation?

It should be part of the normal server install.

>>So cloning the database is the same as restoring database from a backup, is it?

The term 'clone' means an exact copy.  How you achieve the exact copy is up to you.

Restoring from a backup is the most common way.
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how can I backup an Oracle database without using RMAN?
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by:slightwv (䄆 Netminder)
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Shut down the database, copy all the necessary files, start the database back up.

This is typically called a cold-backup.
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