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[oracle@rdb02 admin]$ cat sqlnet.ora
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
SQLNET.ALLOWED_LOGON_VERSION_SERVER=8
SQLNET.ALLOWED_LOGON_VERSION_CLIENT=8
SQL> ALTER USER system IDENTIFIED BY 12345678;
SQL> select username,password,PASSWORD_VERSIONS from dba_users where username in ('SCOTT','SYSTEM')
USERNAME PASSWORD PASSWORD_VERSIONS
-------------------- -------------------- --------------------
SYSTEM 11G 12C #要求客户端的版本最低为11.2.0.3
SCOTT 10G 11G 12C #要求客户端的版本最低为10
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