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I hope you can connect your Oracle9i database from Oracle10g as the same way how you connect from Oracle10g itself.

But you have to add Oracle9i connection details at your Oracle10g TNSNAMES.ORA file.

Simply you copy any other connection setting and change the name, Sid or source name, host name or ip address.

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Q: How do you connect oracle 10G developer to oracle 9I database?
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