1 操作系统和数据库版本

cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 6. (Santiago)

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE    11.2.0.4.0      Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - Production

SQL> 

sqlplus / as sysdba

SQL*Plus: Release 10.2.0.5.0 - Production on Tue Feb 27 16:37:49 2024

Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bi
PL/SQL Release 10.2.0.5.0 - Production
CORE    10.2.0.5.0      Production
TNS for Linux: Version 10.2.0.5.0 - Production
NLSRTL Version 10.2.0.5.0 - Production

SQL> 

2 问题现象

sqlplus / as sysdba

SQL*Plus: Release 10.2.0.5.0 - Production on Tue Feb 27 16:31:39 2024

Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> create public database link portal319 connect to portal identified by "xxx" using '10.2.0.1/eomdb';

Database link created.

SQL> select * from dual@portal319;
select * from dual@portal319
                   *
ERROR at line 1:
ORA-12547: TNS:lost contact

3 问题处理

[eoms@yy admin]$ vi sqlnet.ora

tcp.validnode_checking=yes
sqlnet.encryption
SQLNET.EXPIRE_TIME=10
tcp.invited_nodes=(10.2.0.1,10.2.0.3)
sqlnet.inbound_connect_timeout=30

lsnrctl stop

lsnrctl start