为什么在cx_Oracle.SYSDBA模式下拒绝系统登录 [英] why system login is denied in cx_Oracle.SYSDBA mode

问题描述

我正在尝试通过cx_Oracle模块连接到Oracle 12c。
使用以下代码登录可以在cx_Oracle.connect方法中未提及任何模式的情况下工作

I am trying to connect to Oracle 12c through cx_Oracle module. Login using following code works where no mode is mentioned in cx_Oracle.connect method

import cx_Oracle                                                                
ip = 'ip'                                                             
port='1521'                                                                    
SID='orcl'                                                                     
dsn_tns = cx_Oracle.makedsn(ip, port, SID)                                     
db = cx_Oracle.connect('system', 'password', dsn_tns)

但是对于以下方式，它显示cx_Oracle.SYSDBA无效的登录错误

but for following way it shows invalid login error for cx_Oracle.SYSDBA mode.

db = cx_Oracle.connect('system', 'password', dsn_tns, cx_Oracle.SYSDBA) 

错误：

cx_Oracle.DatabaseError: ORA-01017: invalid username/password; logon denied

我在这里错过了什么？凭据相同。
我尝试如下手动登录并成功

What am I missing here ?? credentials are same. I tried login manually as follows and is successful

>sqlplus system/password as sysdba

推荐答案

如果以用户 sys 连接，则需要使用 cx_Oracle.SYSDBA 模式：

If you connect as user sys, you need to use the cx_Oracle.SYSDBA mode:

conn = cx_Oracle.connect('sys', 'password', dsn_tns, cx_Oracle.SYSDBA)
ok

conn = cx_Oracle.connect('sys', 'password', dsn_tns)
ORA-28009: connection as SYS should be as SYSDBA or SYSOPER

但是，如果以用户身份连接系统，则不能使用 cx_Oracle.SYSDBA 模式：

However, if you connect as user system, you mustn't use the cx_Oracle.SYSDBA mode:

conn = cx_Oracle.connect('system', 'password', dsn_tns)
ok

conn = cx_Oracle.connect('system', 'password', dsn_tns, cx_Oracle.SYSDBA)
ORA-01017: invalid username/password; logon denied

用户sys与系统的差异以实例此处。

The difference of the users sys and system is explained for instance here.

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