使用錯誤的作業系統使用者exp資料導致ORA-15186錯誤

生產環境alert日誌中出現如下錯誤：
Fri Dec 30 14:28:28 2016
Errors in file XXXXXX.trc:
ORA-15186: ASMLIB error function = [asm_init],  error = [18446744073709551611],  mesg = [Driver not installed]
ERROR: error ORA-15186 caught in ASM I/O path 

檢視trace檔案報錯如下
*** 2016-12-28 17:49:27.678
*** SESSION ID:(675.38627) 2016-12-28 17:49:27.678
*** CLIENT ID:() 2016-12-28 17:49:27.678
*** SERVICE NAME:(SYS$USERS) 2016-12-28 17:49:27.678
*** MODULE NAME:(exp@xxxxxx (TNS V1-V3)) 2016-12-28 17:49:27.678
*** ACTION NAME:() 2016-12-28 17:49:27.678
確定為exp環境變數錯誤導致，exp建議應該使用oracle使用者操作