创建测试脚本
通过在三个会话中同时执行test_login.sh脚本,模拟当数据库多个短连接情况性能
[oracle@xifenfei tmp]$ more test_login.sh #!/bin/bash echo "start login database `date`*********" >>/tmp/test_1.log e=2000 for((i=1;i<=$e;i=i+1)) do /tmp/login_oracle.sh done echo "end login database `date`*********" >>/tmp/test_1.log [oracle@xifenfei tmp]$ more login_oracle.sh #!/bin/bash sqlplus chf/xifenfei@ORA11G_P</dev/null select to_char(sysdate,\'yyyy-mm-dd hh24:mi:ss\') from dual; exit XFF --ORA11G_P根据不同的测试情景指定不同名称
情况1:一个监听情况下
start login database Tue May 1 18:03:32 CST 2012********* start login database Tue May 1 18:03:35 CST 2012********* start login database Tue May 1 18:03:37 CST 2012********* end login database Tue May 1 18:08:20 CST 2012********* end login database Tue May 1 18:08:25 CST 2012********* end login database Tue May 1 18:08:26 CST 2012********* --计算2000个会话登录/查询/推出时间 4:48 4:40 4:49
情况2:三个监听,客户端配置tns负载均衡
--监听配置 LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.10)(PORT = 1521)) ) ) SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = ora11g) (ORACLE_HOME = /u01/oracle/oracle/product/11.2.0/db_1) (SID_NAME = ora11g) ) ) ADR_BASE_LISTENER = /u01/oracle LISTENER1 = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.10)(PORT = 1522)) ) ) SID_LIST_LISTENER1 = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = ora11g) (ORACLE_HOME = /u01/oracle/oracle/product/11.2.0/db_1) (SID_NAME = ora11g) ) ) ADR_BASE_LISTENER1 = /u01/oracle LISTENER2 = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.10)(PORT = 1523)) ) ) SID_LIST_LISTENER2 = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = ora11g) (ORACLE_HOME = /u01/oracle/oracle/product/11.2.0/db_1) (SID_NAME = ora11g) ) ) ADR_BASE_LISTENER2 = /u01/oracle --tns配置 ORA11G_M = (DESCRIPTION = (LOAD_BALANCE=ON) (FAILOVER=ON) (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.10)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.10)(PORT = 1522)) (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.10)(PORT = 1523)) (LOAD_BALANCE = yes) ) (CONNECT_DATA = (SERVER=DEDICATED) (SERVICE_NAME = ora11g) ) ) --测试结果 start login database Tue May 1 17:51:45 CST 2012********* start login database Tue May 1 17:51:49 CST 2012********* start login database Tue May 1 17:51:51 CST 2012********* end login database Tue May 1 17:55:58 CST 2012********* end login database Tue May 1 17:56:06 CST 2012********* end login database Tue May 1 17:56:09 CST 2012********* --计算2000个会话登录/查询/推出时间 4:13 4:17 4:18
情况2:使用常驻连接池DRCP(11g新特性)
--启动默认DRCP SQL> exec dbms_connection_pool.start_pool(); PL/SQL procedure successfully completed. --tns配置 ORA11G_P = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.10)(PORT = 1521)) ) (CONNECT_DATA = (SERVER=POOLED) --注意 (SERVICE_NAME = ora11g) ) ) --执行结果 start login database Tue May 1 18:19:58 CST 2012********* start login database Tue May 1 18:20:01 CST 2012********* start login database Tue May 1 18:20:03 CST 2012********* end login database Tue May 1 18:23:16 CST 2012********* end login database Tue May 1 18:23:19 CST 2012********* end login database Tue May 1 18:23:21 CST 2012********* --计算2000个会话登录/查询/推出时间 3:16 3:18 3:19
总结
如果在数据库短连接过程中发现监听是瓶颈的时候,可以考虑使用多个监听+tns 负载均衡,从一定程度上缓解监听瓶颈.如果是11g数据库可以考虑使用其心功能DRCP,从而很大程度上提高短连接过程中数据库的效率.因为DRCP还属于11g的新功能稳定性不知道如何?使用该功能前,请一定要做好相关测试工作.如有可能还是建议从应用层面尽可能的使用长连接,提高数据库会话效率.
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