The optional -r switch will delete the user's home directory and all its contents in addition to the user.
使用可选的 -r开关可以将用户的主目录及所有相关信息全部删除。
2
In order to switch a user on a trusted connection, the application must first call xa_end (TM_SUCCESS) and specify the new user ID and optional password by calling SQLSetConnectAttr.