通过wallet实现数据库的无密码登陆。
数据库版本：12.2.0.1.0

1，配置tnsnames.ora

cdb =
(DESCRIPTION =
    (ADDRESS_LIST =(ADDRESS=(PROTOCOL= TCP)(HOST=prod04)(PORT=1521)))
    (CONNECT_DATA =
    (SERVER = DEDICATED)
    (SERVICE_NAME = cdb))
)

sbcdb =
(DESCRIPTION =
    (ADDRESS_LIST =(ADDRESS=(PROTOCOL = TCP)(HOST=prod05) (PORT=1521)))
    (CONNECT_DATA =
    (UR=A)
    (SERVER = DEDICATED)
    (SERVICE_NAME = sbcdb))
)

2,配置sqlnet.ora

NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES, HOSTNAME,EZCONNECT)
WALLET_LOCATION=(SOURCE=(METHOD=FILE)(METHOD_DATA=(DIRECTORY=/u01/app/oracle/wallet/)))
SQLNET.WALLET_OVERRIDE=TRUE

3，创建一个钱包来存储认证信息

mkdir -p /u01/app/oracle/wallet/
mkstore -wrl /u01/app/oracle/wallet/ -create
mkstore -wrl /u01/app/oracle/wallet/ -createCredential cdb sys oracle
mkstore -wrl /u01/app/oracle/wallet/ -createCredential sbcdb sys oracle
#mkstore参数说明：
-createCredential connect_string username password
-modifyCredential connect_string username password
参数为"alias（tnsname.ora别名） username  password".

#创建步骤，需要输入一个钱包密码：
[oracle@prod04 admin]$ mkdir -p /u01/app/oracle/wallet/
[oracle@prod04 admin]$ mkstore -wrl /u01/app/oracle/wallet/ -create 
Oracle Secret Store Tool Release 18.0.0.0.0 - Production
Version 18.1.0.0.0
Copyright (c) 2004, 2017, Oracle and/or its affiliates. All rights reserved.

Enter password:   
Enter password again:   
[oracle@prod04 admin]$ mkstore -wrl /u01/app/oracle/wallet/ -createCredential cdb sys oracle
Oracle Secret Store Tool Release 18.0.0.0.0 - Production
Version 18.1.0.0.0
Copyright (c) 2004, 2017, Oracle and/or its affiliates. All rights reserved.

Enter wallet password:   
[oracle@prod04 admin]$ mkstore -wrl /u01/app/oracle/wallet/ -createCredential sbcdb sys oracle
Oracle Secret Store Tool Release 18.0.0.0.0 - Production
Version 18.1.0.0.0
Copyright (c) 2004, 2017, Oracle and/or its affiliates. All rights reserved.

Enter wallet password:   
[oracle@prod04 admin]$

4，测试登陆

测试cdb,sbcdb 是否能登陆成功？

[oracle@prod04 ~]$ sqlplus /nolog

SQL*Plus: Release 12.2.0.1.0 Production on Fri Aug 31 12:13:54 2018

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

SQL> conn /@cdb as sysdba
Connected.
SQL> conn /@sbcdb as sysdba
Connected.
SQL>