User running TPC-C transaction test experiencing an aborted job and the following error message appears:
Started test 'TPC-C Transaction Mix':
Agent(ORATCE-1950-02) Error: New Order : Statement 2 OCIStmtExecute
Agent(ORATCE-1950-02) Error: Unable to attach to a server in logon().
ORA-12560: TNS:protocol adapter error
Try using SIDs in your tnsnames.ora file instead of using the service names.