Where should I put the TNSNAMES.ora file?
You should always check with your DBA as some organization may have one central location on the network drive; however, in general your TNSNAMES.ora should go into the \network\admin directory of your Oracle Home.
So if your Oracle Home is E:\oracle\product\11.1.0\client_1\, then you should put it into E:\oracle\product\11.1.0\client_1\network\admin.
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