【Oracle问题集3】ORA-12543: TNS:destination host unreachable

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执行语句：表示操作数据库过程 出错现象：表示操作数据库过程出现错误现象 出错原因：表示出现错误的原因 解决方法：表示解决错误的方法 相关知识：表示与这个主题相关的知识 ==================================================================== 执行语句： 连接数据库： connect sys/oracle@192.168.135.243/orcl as sysdba 出错现象： ORA-12543: TNS:destination host unreachable 错误原因：

sqlnet.ora文件中的NAMES.DIRECTORY_PATH= (TNSNAMES,EZCONNECT)，添加ezconnect参数值，所以如果指定数据库实例，必须要跟上主机ip地址。请参考【Easy Connect Naming】。因此正确的写法是：CONNECTusername/password@host[:port][/service_name] 例如connect sys/oracle@192.168.135.243/orcl as sysdba

解决方法：

连接数据库时需要指定主机ip地址：connect sys/orcl@192.168.135.243/orcl as sysdba

相关知识： 以下知识来源于oracle官方文档

Naming Method	Description
Local Naming	Resolves anet service namestored in atnsnames.orafile stored on a client Local naming is most appropriate for simple distributed networks with a small number of services that change infrequently. See Also:"Configuring the Local Naming Method"
Directory Naming	Resolves a databaseservice name, net service name, ornet service aliasstored in a centralized LDAP-compliant directory server See Also:"Configuring the Directory Naming Method"
Easy Connect Naming	Enables clients to connect to a database server without any configuration. Clients use a connect string for a simple TCP/IP address, consisting of a host name and optional port and service name: CONNECTusername/password@host[:port][/service_name] This method is recommended for simple TCP/IP environments. See Also:"Using the Easy Connect Naming Method"
External Naming	Resolves service information stored in an a third-party naming service See Also:"Configuring External Naming Methods"

相关监听配置测试工具命令：lnsrctl、tnsping
listener.ora文件内容：

# listener.ora Network Configuration File: /home/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora # Generated by Oracle configuration tools. SID_LIST_LISTENER= (SID_LIST= (SID_DESC= (SID_NAME=orcl) (ORACLE_HOME=/home/oracle/app/oracle/product/11.2.0/dbhome_1) ) )
LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521)) (ADDRESS = (PROTOCOL = TCP)(HOST=192.168.135.243)(PORT = 1521)) ) ) ADR_BASE_LISTENER = /home/oracle/app/oracle

tnsnames.ora文件内容

# tnsnames.ora Network Configuration File: /home/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/tnsnames.ora # Generated by Oracle configuration tools. ORCL = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST =192.168.135.243)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl.192.168.132.243) ) )

sqlnet.ora

# sqlnet.ora Network Configuration File: /home/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/sqlnet.ora # Generated by Oracle configuration tools. NAMES.DIRECTORY_PATH= (TNSNAMES,EZCONNECT) ADR_BASE = /home/oracle/app/oracle

本文标签： ORAORACLEtnsUnreachableHost