知识大全关于JDBC客户端如何连接ORACLE数据库RAC的负载均衡

Posted 2022-07-16 数据库

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　　这篇文章主要介绍如何使用jdbc配置连接数据库(oracle的RAC配置的数据库)达到负载均衡的情况该例子是以个NODE的情况说明希望对大家有所帮助

　　我的问题是我需要设置oracle x的thin客户端连接到oracle的RAC环境上

　　注:这样连接可以通过RAC自动平衡负载

　　原文如下:

　　Hi Tom

　　I couldn t find this information easily on the net So I m submitting it hereand hope you make it available for anyone else looking for this information

　　My problem was I needed to configure the Oracle x thin driver (type IV) toconnect to an Oracle Real Application Cluster (RAC) environment

　　For example assuming you have a database called RAC_DB with o nodes node and node

　　You would need to configure your tnsnames ora with the following information inthe following way:

　　RAC_DB = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = node )(PORT = )) (ADDRESS = (PROTOCOL = TCP)(HOST = node )(PORT = )) (LOAD_BALANCE = yes) (FAILOVER = on) ) (CONNECT_DATA = (SERVICE_NAME = RAC_DB) (FAILOVER_MODE = (TYPE = SELECT) (METHOD = BASIC) (RETRIES = ) (DELAY = ) ) ) )

　　Now if you start a SQL*PLUS session then you should see a connection on thenode instance If you start another SQL*PLUS session then Oracle shouldconnect you to the node instance (automatic load balancing) It s actuallypretty cool to see the first time

　　To pass this same information to the Oracle s JDBC thin driver you essentiallyconcatenate a shorten version of the tnsnames information above and pass this tothe driver

　　String userid = scott ; String password = tiger ;

　　String tnsnames_info = (DESCRIPTION=(ADDRESS_LIST= + (ADDRESS=(PROTOCOL=TCP)(HOST=node )(PORT= )) + (ADDRESS=(PROTOCOL=TCP)(HOST=node )(PORT= )) + (LOAD_BALANCE=yes)(FAILOVER=on)) + (CONNECT_DATA=(SERVICE_NAME=rac_db))) ;

　　String url = jdbc:oracle:thin:@ + tnsnames_info;

　　DriverManager registerDriver(new oracle jdbc OracleDriver()); Connection dbConnection = DriverManager getConnection(url userid password);

　　That s it If your application creates multiple connection to the database then you should see these connections load balance across the o instances

　　One last note Oracle only supports connection to a RAC configuration with the i drivers so you should try to get the latest Oracle JDBC thin driver

　　HTH Peter

　　 and we said

　　you made it really hard you just needed the service! the load balancing andall could be/should be setup on the listener side!

　　you have one listener both databases register with it as a service

　　that would be another option

　　Reviews

　　 I think we tried that and it didn t work September Reviewer: Peter Tran from Houston TX USA

　　Hi Tom

　　I m pretty sure we tried that but it didn t work with the thin driver Thatapproach will work if you use the OCI driver but not with the thin driver

　　Please send me an example of what you mean or what files I should configure totest it out

　　I m always opened to easier options

　　Thanks Peter

　　Followup:you need to set up mts and a single listener thats it

　　pmon on each of the rac instances will tell the listener about the load and awayit goes you might not see the round robin right off (both are not yetloaded ) so it ll be an unbalanced load balance initially but as the systemramps it ll balance out

　　 Unknown territory September Reviewer: Peter Tran from Houston TX USA

　　I m sorry but I really lost you with that last remendation Rather thanfrustrate you with my ignorance can you remend the Oracle documentation thatI should read to brush up on this information?

　　I ll read this first and e back with questions if I m still lost

　　For example I don t understand why you want me to setup the database as MTS Why can t I use dedicated server mode?

　　Thanks for the quick response

　　 Peter

　　Followup:in order for a single listener to service many instances on differentmachines the listener must be servicing shared server connections thelistener cannot fork/exec a dedicated server since the listener may well notbe running on the machine the instance is on it needs to know dispatcheraddresses to redirect the client request to

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知识大全 关于JDBC客户端如何连接ORACLE数据库RAC的负载均衡

知识大全关于JDBC客户端如何连接ORACLE数据库RAC的负载均衡