Essential resources for business and IT professionals tasked with designing an effective enterprise-wide business applications strategy – covering issues on cloud vs. on-premises apps, purchasing tips, implementation and upgrade best practices and...
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Then you have a TNS configuration problem. The most common problem is that
the tnsnames.ora file on the client isn't configured properly or that the
listener on the server isn't running. If you include actual error messages
(with error numbers, like TNS-12545), you'll get better advice. This was first published in September 2004
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