create public database
link creditdblink connect to yizhen123
identified by yizhen123 using ‘(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.220.253)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = damocles.orcl)
)
)‘
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修改再添加登录密码
原文：http://www.cnblogs.com/adolfmc/p/4184998.html