About Oracle error “Cannot load OCI DLL” Shiji Pan 12 years ago When you use Oracle tools that call Oracle client dll “oci.dll”, you may meet this error. Cannot load OCI DLL When you use these Withdata Softwares: FileToDB DBToFile DBLoader DBCopier DBBlobEditor MongoToDB DBToMongo you can choice “TCP/IP Connect” on Oracle logon form to avoid this error.