According to Spotlight requirements:
Note: Spotlight will run on 64-bit versions of the client operating system with the use of a 32-bit Oracle client.
If you have 64-bit server and 32-bit client installed on the same computer it's possible that Spotlight looks for oci.dll
at wrong Oracle Home.
Examine order of Oracle home directories from Universal Installer and place 32-bit home first:
- Run Oracle Universal Installer
- Click "Installed Products" button
- Switch to "Environment" tab
- Reorder Oracle Homes with arrows on right side and click "Apply"