ORA-29393：user string does not exist or is not logged on
错误码
错误描述：user string does not exist or is not logged on
错误原因：An invalid user name was specified as argument to procedure SET_INITIAL_CONSUMER_GROUP of package DBMS_RESOURCE_MANAGER or SWITCH_CONSUMER_GROUP_FOR_USER of package DBMS_SYSTEM or the specified user was not logged on.
解决方法：Specify a valid user name.
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