Preventive Service Planning
Based on the fact, Optim is a 32bit application, which also can be used / installed on a Linux 64bit operation system, a customer has to install the correct Oracle client version to be able to connect the Oracle database on Linux x64.
Starting with Oracle 11gR2 clients will no longer contain the 32bit libraries. For that reason, a 32bit Oracle client has to be installed, to be able to use Optim on Linux x64 as server.
To get the full functionality of Optim, use the "Administrator" installation type. This type contains all libraries needed and the binaries, for example, sqlldr, the Oracle SQL Loader, sometimes needed.
Oracle® Database Client Installation Guide
11g Release 2 (11.2) for Linux
1.2.3 Separate 32-Bit Client Shiphome for 64-Bit Ports
The supported database versions of Oracle with a current Oracle client you can find at Oracle directly:
Note:207303.1 "Oracle Client / Server Interoperability Support"
For 11.1-clients that means:
Server must have 220.127.116.11 or higher, 18.104.22.168 is not supported.