Odp.Net - Depending on the client and server

Question

I have question from theory. My application uses Odp.Net. I add as reference file Oracle.DataAccess.dll version 2.112.3.0. I am using Odp.Net to query database and to registry query notifications. On each computer i install ODAC 11.2 Release 5 (11.2.0.3.20) from http://www.oracle.com/technetwork/database/windows/downloads/utilsoft-087491.html.

I would like to know what dependencies are between my Odp.Net version, Oracle Client version (which can be installed on client machine) and Oracle Server Version.

The problem is that after I register query notification I can see row in USER_CHANGE_NOTIFICATION_REGS table. But after few seconds this notification is unregistered and dissapear. I read that this is connected with version problem, but i cant understand what i have to do.

My goal is to use same Odp.Net files (Oracle.DataAccess.dll + some extra dependencies like oci.dll etc) in my application.

Answer 1

Resolved Oracle server version 11.2.0.1.0 and 11.2.0.2.0 has a bug. If client in other version register event it will eb automatically unregistered after first database change. To resolve it i had to wirte persistant command: alter system set event=’10867 trace name context forever, level 1, COMMENT =’komentarz’ SCOPE=SPFILE;

Answer 2

ODP version decrypted

a.b.c.d (e.g. 2.112.3.0):

• a (2) .Net version (2.0+ in your case)
• b (112) Oracle Client version (11.2+ in your case)
• c, d (3, 0) ODP version (3d version of ODP for .Net 2.0 for Oracle Client 11.2)

Another example: "4.100.1.0" - ODP for .Net 4.0+ and Oracle Client 10.0+ 1st version

Answer 3

There was a bug in 11.2.0.1 database regarding change notification.

The following SQL causes Oracle to avoid the buggy code path with the older version, but you are advised to upgrade the database:

alter system set events '10867 trace name context forever, level 1';

This is not meant to be a permanent solution. You should upgrade both ODP.NET and patch the database to the latest 11.2 patchset.

Christian Shay

Oracle