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how to fix it I am new in Oracle?

I tried to connect RMAN and it showed me this error...

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migrated from Dec 28 '13 at 15:29

This question came from our site for professional and enthusiast programmers.

Are you trying to connect to an instance on your own machine? The "/" syntax implies you are trying to connect locally, but the "client_1" in the path implies you are not running a server locally. – Jon Heller Dec 28 '13 at 5:31

please check your alert.log for your database instance (your database instance must running).

if you use catalog database, it must be open (the target database does not need to be open).

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