Difference between the Data Guard and Stand By

Hi,
Can any one specify the difference between the Standy and Data Guarding.
Since are the Advantages of Data Guarding over the
User Created Stand By Database.
Thanks
Pavan Kumar N

DataGuard is used to allow you to create and manage standby databases, so I'm not totally clear on your question. If you're using DataGuard, you're creating standby databases.
Are you talking about the difference between using DataGuard to manage your standby databases rather than writing your own scripts to manage your standby databases? If so, you've got cost issues-- DataGuard requires the enterprise edition, while you could write your own standby scripts using the standard edition. You've got support and testing issues-- if something goes wrong, you're on your own to debug your scripts. If you're using DataGuard, there is a variety of documentation available and a variety of options for support. Oracle has also invested quite a bit of time testing DataGuard with various failure scenarios-- it's likely that you wouldn't have that much time to test your own scripts. On a day-to-day basis, DataGuard provides integration with various monitoring utilities (i.e. Enterprise Manager) and provides a rather nice set of tables to view information about what's going on. DataGuard also provides functionality like the ability to automatically detect and resolve gaps in the archived log files that your scripts would not likely be written to handle.
And, of course, your scripts could only manage a physical standby database. DataGuard can manage both physical and logical standbys.
Justin

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