本文主要是介绍数据库学习案例20240227-数据库连接类故障-ORA-12547: TNS:lost contact，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
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$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE 11.2.0.4.0 Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - ProductionSQL>
sqlplus / as sysdba
SQL*Plus: Release 10.2.0.5.0 - Production on Tue Feb 27 16:37:49 2024
Copyright (c) 1982, 2010, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsSQL> select * from v$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 - ProductionSQL>
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 optionsSQL> 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=30lsnrctl stop
lsnrctl start
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