[转载]Oracle RAC客户端连接不稳定的解决方法-白红宇

[转载]Oracle RAC客户端连接不稳定的解决方法

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发布时间：2019-05-24

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Oracle RAC安装完毕后，监听、tnsname.ora按照Oracle默认配置好后，在服务器端用sqlplus连接没有问题，但是用客户端连接，会出现有时候连不上的错误，解决方法：

1、修改监听文件，增加SID_LIST_LISTENER，两台机器都要修改，修改完毕后如下：

LISTENER_ORCL1 =

(DESCRIPTION_LIST =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.1)(PORT = 1521))

)

SID_LIST_LISTENER_ORCL1 =

(SID_LIST =

(SID_DESC =

(ORACLE_HOME = /u01/app/oracle/product/11.1.0)

(SID_NAME = ora1)

)

2、修改tnsname.ora，两台机器都要修改，例如第一台机器：

用Oracle的netca配置的时候，只配置了一个监听LISTENERS_ORCL，手工增加另外两个监听。

LISTENER_ORCL2 =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))

)

LISTENER_ORCL1 =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.1)(PORT = 1521))

)

LISTENERS_ORCL =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.1)(PORT = 1521))

)

ORCL1 =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.1)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = ORCL)

)

ORCL2 =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = ORCL)

)

ORCL =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.1)(PORT = 1521))

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))

(LOAD_BALANCE = yes)

)

(CONNECT_DATA =

(SERVER = DEDICATED)

(SERVICE_NAME = ORCL)

)

3、修改pfile，将两个本地监听设置上。

可以先导出一份spfile，修改完毕后再导入pfile。增加以下三行：

*.local_listener='LISTENER_ORCL'

ora1.local_listener='LISTENER_ORCL1'

ora2.local_listener='LISTENER_ORCL2'

另外，在启动oralce时，出现ora-32006的错误，数据库倒是起来能用。到网上搜索一通，说是oracle10g以后将*.log_archive_start=TRUE 这个参数去掉了，把这行从spfile中删除了，再启动没有报错。是否真的不需要这个参数，还需要再确认。

4、oracle驱动

经测试发现，在oracle RAC环境下，如果down掉一个实例，应用出现以下错误：

Io 异常: Software caused connection abort: socket write error

org.apache.cocoon.ProcessingException: error on execute servlet:login: javax.servlet.ServletException: error on execute servlet:login

cause: java.sql.SQLException: Io 异常: Software caused connection abort: socket write error

经反复测试，确定原因是oracle的驱动ojdbc14.jar没有放到WEB-INF/lib下的原因。此启动在公共lib下，必须COPY到当前工程下，才能实现fail-over的自动切换.

5、测试jdbc连接的程序：

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.Properties;

public class RacTest {

/**

* 测试RAC

* @param args

* @throws ClassNotFoundException

public static void main(String[] args) throws ClassNotFoundException {

String url;

Connection conn = null;

Statement stmt = null;

ResultSet rs = null;

Properties conProps = new Properties();

conProps.put("user", "sys");

conProps.put("password", "XXXX");

conProps.put("internal_logon", "sysdba");

url = "jdbc:oracle:thin:@(description= (ADDRESS_LIST =";

url += "(address=(protocol=tcp)(host=192.168.0.1)(port=1521))"; // 服务器IP

url += "(address=(protocol=tcp)(host=192.168.0.2)(port=1521))";

url += "(load_balance=yes))"; // 是否负载均衡

url += "(connect_data =";

url += "(server = dedicated)";// 专用服务器模式可以去掉？

url += "(service_name=orcl)"; // 服务名

//url += "(failover_mode =";

//url += "(type=session)";

//url += "(method=preconnect)";

//url += "(retries=5)";

//url += "(delay=15))";

url += " ))";

/**

* LOAD_BALANCE = yes表示程序走sword连接的时候，将在下面的地址里面随机的选择一个，达到接点间连接均匀

* failover表示开启TAF(Transparent Application Failover)特性，其中TYPE = * SESSION表示当一个连接好的会话 * 的实例发生故障，系统会自动将会话切换到其他可用的实例，前台应用无须再度发起连接，但会话正在执行的SQL 需要重新执行，METHOD = * BASIC表示初始连接就连接一个接点，他还有个选项是preconnect，表示初始连接所有的 * 接点，在failover的时候可以很快就切过去，这个基本是资源浪费 RETRIES:重试次数 DELAY:重试间的延迟(以秒为单位)

* 如果指定了RETRIES，DELAY默认为1 如果指定了DELAY，RETRIES默认为5

// String sql = "select * from oa_sfm_fb_fwgl t where t.pk_id =

// '17233'";

String sql = "select * from v$instance";

try {

Class.forName("oracle.jdbc.driver.OracleDriver");

conn = DriverManager.getConnection(url, conProps);

// conn = DriverManager.getConnection(url, username, password);

stmt = conn.createStatement();

rs = stmt.executeQuery(sql);

if (rs.next()) {

System.out.print(rs.getString("INSTANCE_NAME"));