1. Tnsnames.ora Example

TNSNAMES.ORA is a SQL.Net configuration file that defines databases addresses for establishing connections to them. This file normally resides in the ORACLE HOME NETWORK ADMIN directory, but location can be defined by the TNSADMIN environment variable. If you are running multiple releases of Oracle client software on your PC, you may find yourself with several tnsnames.ora files. For example, on one of the PCs that I am using to write this course, I have the following.

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You've been given hints of what to do. Here's a more detailed answer; hopefully, it'll help.Basically, every Oracle software product (I've worked with) has its own TNSNAMES.ORA file. If you want to be able to connect to a new database, you have to enter it into each of those TNSNAMES.ORA files. '6 files' means '6 edits' (or '1 edit + 5 copies') which means that have 6 exactly the same files.In order to avoid that, use option which will let you to keep and maintain only one TNSNAMES.ORA file. In order to do that, I'd suggest you to. create a new directory (such as - on MS Windows - c:oralibrary). copy any of existing tnsnames.ora files in there.

edit its contents so that it contains all databases you are connecting to. then create tnsadmin environment variable.

Tnsnames.ora Example

Again, on MS Windows (7):. Start - right click 'Computer' - Properties. Advanced system settings. Advanced tab - Environment variables button. For System variables, create a new variable whose name is tnsadmin and its value is directory you've previously created: c:oralibraryIf you check it on the command prompt, it looks like this: C:set tnsadmintnsadmin=C:oralibraryThat's all; the next step is to test it. No matter which Oracle software you try, it should be able to establish connection.From now on, any change you have to make should be done in the c:oralibrarytnsnames.ora file; disregard any other file (you can even delete them or rename to e.g.

Tnsnames.old to avoid confusion).