ORA-12154: TNS:could not resolve the connect identifier specified--sys密码包含@符号

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问题描述：在操作系统登录数据库时，由于忘记了sys密码，重新修改的sys密码包含@符号，登录时报错，

 ORA-12154: TNS:could not resolve the connect identifier specified

要使用在线恢复恢复DG，所以要连接到主库测试tns的连通情况

备库上验证：

[2021/4/23 20:51:13] [oracle@PEKPBSDIHDBP02 dbs]$ sqlplus "sys/elcarO@321qwe"@ORCLDG1 as sysdba

[2021/4/23 20:51:14]

[2021/4/23 20:51:14] SQL*Plus: Release 11.2.0.4.0 Production on Fri Apr 23 20:44:06 2021

[2021/4/23 20:51:14]

[2021/4/23 20:51:14] Copyright (c) 1982, 2013, Oracle.  All rights reserved.

[2021/4/23 20:51:14]

[2021/4/23 20:52:34] ERROR:

[2021/4/23 20:52:34] ORA-12154: TNS:could not resolve the connect identifier specified

登录密码包含@，在界面登录需要转义

主库上验证：

[2021/4/23 20:55:11] [oracle@PEKPBSDIHDBP02 dbs]$ sqlplus sys/\"elcarO@321qwe\"@orcl_stb as sysdba

[2021/4/23 20:55:11]

[2021/4/23 20:55:11] SQL*Plus: Release 11.2.0.4.0 Production on Fri Apr 23 20:48:03 2021

[2021/4/23 20:55:11]

[2021/4/23 20:55:11] Copyright (c) 1982, 2013, Oracle.  All rights reserved.

[2021/4/23 20:55:11]

[2021/4/23 20:55:11]

[2021/4/23 20:55:11] Connected to:

[2021/4/23 20:55:11] Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

[2021/4/23 20:55:11] With the Partitioning, OLAP, Data Mining and Real Application Testing options

转义写法：sqlplus sys/\"密码\"@tnsname

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