在linux系統中用Oracle帳號執行DBCA或其他Java圖形界面程序時，報錯：
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified
Error: Can't open display: :0.0
解決辦法：用root登陸，在#提示符后輸入：
xhost local:oracle non-network local connections being added to access control list
敲回車運行后出現：
non-network local connections being added to access control list
xhost: bad hostname "non-network"
xhost: bad hostname "local"
xhost: bad hostname "connections"
xhost: bad hostname "being"
xhost: bad hostname "added"
xhost: bad hostname "to"
xhost: bad hostname "access"
xhost: bad hostname "control"
xhost: bad hostname "list"
此時再 su - oracle 切換到Oracle用戶執行圖形界面任務就可以了
man xhost中有這樣一段
A complete name has the syntax ‘‘family:name’’ where the families are as follows:
inet Internet host (IPv4)
inet6 Internet host (IPv6)
dnet DECnet host
nis Secure RPC network name
krb Kerberos V5 principal
local contains only one name, the empty string
si Server Interpreted
其中local那個是用來解決同一台機器的不同用戶訪問X的問題的。