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I'm developing on a new .NET application that needs to read/write data from an Oracle 9i database. I've got it working with ODAC 11.2.0.4 which comes with Instant Client 11.2. I had selected this version because I had read that Oracle 12c Client was only backwards Compatible to version 10g release 2 servers. Unfortunately I can't find that reference.

I would prefer to use latest version of ODAC 12.2, but I need to confirm that I'll still be able to connect to a 9i database.

Note: All the links I found to Oracle Compatibility charts are hidden behind an Oracle registration wall that isn't currently working for new signups. So I'm asking the question here.

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  • Why would you prefer using ODAC 12.2 with the 9i database, given that ODAC 11.2 already works?
    – mustaccio
    Commented Aug 21, 2017 at 23:45
  • The app also connects to 12c databases.
    – Josh
    Commented Aug 21, 2017 at 23:50

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This is from behind the Oracle registration wall:

Client / Server Interoperability Support Matrix for Different Oracle Versions (Doc ID 207303.1)

Client Version: 12.2.0 or 12.1.0
Server Version: 9.2.0
Supported: No #3

Where:

#3: An ORA-3134 error is correctly reported when attempting to connect to this version.

So I would not expect it to work at all.

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