Oracle RAC客户端连接不稳定的解决方法_绿色软件之家

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Oracle RAC客户端连接不稳定的解决方法

时间:2015/6/28来源:绿色软件之家作者:网管联盟我要评论(0)

  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"));

  }

  rs.close();

  rs = null;

  stmt.close();

  stmt = null;

  conn.close();

  conn = null;

  } catch (SQLException ex) {

  ex.printStackTrace();

  } finally {

  if (rs != null) {

  try {

  rs.close();

  rs = null;

  } catch (Exception ex) {

  ex.printStackTrace();

  }

  }

  if (stmt != null) {

  try {

  stmt.close();

  stmt = null;

  } catch (Exception ex) {

  ex.printStackTrace();

  }

  }

  if (conn != null) {

  try {

  conn.close();

  conn = null;

  } catch (SQLException ex) {

  ex.printStackTrace();

  }

  }

  }

  }

  }

  第一步就是:$ORACLE_HOME/admin/listerer.ora那个文件,用netca自动生成时只有LISTENER_ORCL1 =

  (DESCRIPTION_LIST =

  (DESCRIPTION =

  (ADDRESS_LIST =

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

  )

  )

  )

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