Hello Ning,
The Oracle client and library are installed in application server, the. tnsping WTKTST was tested working OK from the application server( I wrongly mentioned as HANA server, actually CI sever connected to HANA DB).
In debugging ABAP Database Connectivity (ADBC_TEST_CONNECTION), it fails at
SAP kernel calls CALL 'C_DB_FUNCTION' with sql-code errror 12154.
Thanks
Mani