c3p0 head

ETL tools completed almost, today, encountered a problem, is to C3p0 configured maxpoolsize for 10, the purpose is to let the entire application at the same time to obtain the maximum number of connection is 10, but after testing this part of the application, There are far more than 10 links found on the PostgreSQL side. Because the tool is multi-threaded, so I think, is not a multi-threaded problem, check the number of connection, it is indeed the nu

Reproduced from: http://japi.iteye.com/blog/254786 Thank the original authorThere have been a lot of errors in the use of c3p0. The longest sight is a deadlock, which occupies a relatively large resource.For deadlock problems http://japi.iteye.com/blog/243702. Found the solution (not fully guaranteed, but in the load test, there are no problems)The key to the problem is the setting of the parameterReferencebelong to a single connection rather than th

Tags: sharding first come ROM features tor mid-large number usage performance improvementMainstream database connection poolCommon open source database connection pools are c3p0, DBCP, Tomcat Jdbc pool, BONECP, druid, etc.C3P0: Open source JDBC Connection pool, which implements the data source and Jndi bindings, supports the standard extension of the JDBC3 specification and JDBC2. The open source projects that currently use it are hibernate, spring, a

Tags: span commit sys OTA LIMIT mini CDATA Fetch number AutoFirst, C3P0 Public classConnectionManager { Public StaticCombopooleddatasource DataSource; Static { Try{DataSource=NewCombopooleddatasource (); Datasource.setuser ("FreeSWITCH"); Datasource.setpassword ("FreeSWITCH"); Datasource.setjdbcurl ("jdbc:postgresql://Database Address: Database Port/freeswitch"); Datasource.setdriverclass ("Org.postgresql.Driver"); Datasource.setinitialpoolsi

Tags: style blog http ar color SP data on divProject is b/s mode, placed on a Linux server, Tomcat and oracle11g on a server, Tomcat read database using C3P0 connection pool, has been relatively stable, so there is no pipe. Later, the Tomcat was placed under one win2008 and the database was placed under another win2008. Run for more than half a month, during the regular Report database connection error, but refresh the next page is also good. Because

Label:Package COM.ATGUIGU.JDBC; Import java.io.IOException;Import Java.io.InputStream;Import java.sql.Connection;Import Java.sql.DriverManager;Import java.sql.PreparedStatement;Import Java.sql.ResultSet;Import java.sql.SQLException;Import java.sql.Statement;Import java.util.Properties; Import Javax.sql.DataSource; Import Com.mchange.v2.c3p0.ComboPooledDataSource; public class Jdbctools { Processing of database transactionsCommit a transactionpublic st

Perac =(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP) (HOST = 131.197.17.137) (PORT = 1521))(ADDRESS = (PROTOCOL = TCP) (HOST = 131.197.17.138) (PORT = 1521))(load_balance = yes)(FAILOVER = ON)(Connect_data =(SERVER = dedicated)(service_name = PE)(Failover_mode =(TYPE = SELECT)(METHOD = BASIC)(retries=180)(delay=5)))) It is very simple for me to configure this string connection in the program. Just put this string above the URL tag that previously placed only one URL connection. The previous configur

Reprint from http://feicer.javaeye.com/blog/549822 The Hibernate connection pool algorithm is quite immature. It's just to get you started, and it's not suitable for product systems or performance testing. For best performance and stability you should use a third party connection pool. You only need to replace the hibernate.connection.pool_size with the settings for a specific connection pool. This will turn off Hibernate's own connection pool. For example, you might want to use

Reprint Please specify source: http://blog.csdn.net/l1028386804/article/details/51162560 Today, we will discuss in detail the C3P0 configuration problem in spring, well, without delaying everyone's time, we go directly to the topic, please see the following specific configuration file information: Configuring spring Data Sources C3P0 and DBCP Regardless of the persistence technology, the database must be

Need to create a c3p0-config.xml configuration file* C3P0 configuration file* 1. Configuration file name: C3p0-config.xml* 2. The location of the configuration file must be under the ClasspathCopyModify a fileCapitalize the first letter to lowercaseConfiguration file Setup CompleteRemember to import the database connection jar packageC3P0 jar PackageCode1 Packag

Database connection pool, once configured in the project is generally rarely changed, so many people did not carefully study (sometimes even the operation of the person responsible for configuration), in fact, this knowledge point is still very important, so I summed up here to share, need to use the time to take out to see it. Here we introduce the configuration of C3P0.and other methods to improve the performance of the connection test. Default:fals

First step in Hibernate.cfg.xml configurationfalseAnd then!!!!!!! The exception encountered ======Configuration does not use a purely JDBC connection and is also configured in the Hibernate.cfg.xml falseThe third guide package, D:\HIBERNATE-RELEASE-4.2.21.FINAL\LIB\OPTIONAL\C3P0, the following packages are all directed.Hibernate Configuration c3p0 Connection pool

Importjava.beans.PropertyVetoException;Importjava.sql.Connection;Importjava.sql.SQLException;ImportJavax.sql.ConnectionPoolDataSource;Importjavax.swing.text.DefaultEditorKit.InsertBreakAction;ImportCom.mchange.v2.c3p0.ComboPooledDataSource; Public classConnectData { Public Static voidMain (string[] args) {System.out.println (connectdata.getconnection ()); } Private StaticString username= "LF"; Private StaticString password= "LF"; Public Static

Recently, the project used the data layer combination of hibernate3.0 C3PO MySQL, and the development and deployment were smooth. However, every morning when accessing the application, the cocould not open hibernate session for transaction exception was thrown, caused by: COM. mySQL. JDBC. communicationsexception: communications link failure due to underlying exception, but after several accesses, it returns to normal. The datasource configuration is as follows: According to the problem pheno

C3p0The performance of the connection pool is better than that of DBCP. hibernate recommends this connection pool. The c3p0 connection pool can not only automatically clear connections that are no longer in use, but also automatically clear statement and resultset. Import Java. beans. propertyvetoexception; import Java. SQL. connection; import Java. SQL. resultset; import Java. SQL. sqlexception; import Java. SQL. statement; import COM. mchange. v2.

Oracle 10G tablespace movement, all applicable routines of the TNS listener cannot establish a new connection, service_died 12537, c3p0 connection pool parameters, One Oracle O M experience while learning and working, step by step. A few days ago, after deleting junk data tables and clearing the rollback tablespace, we rebuilt the index again, and felt that oracle's performance was really amazing. The system started to run quickly again. After the cu

Many of the configurations of c3p0 in spring + hibernate on the Internet are almost not completely correct. The following is the correct configuration according to the documents of c3p0 that have been tested many times: Class = "org. springframework. Orm. hibernate3.localsessionfactorybean"> Org. hibernate. dialect. oracle9dialect

Spring 3.1 's package is fully guided + dependency pack Commons-logging-1.1.1.jar + Servlet-api.jar AOP needs a few packages Aopalliance.jar + Aspectjrt.jar + Aspectjweaver.jar + Cglib-nodep-2.1_3.jar Memcache Required Package Java_memcached-release_2.6.1.jar + Dependency Pack Slf4j-api-1.6.1.jar + Slf4j-simple-1.6.1.jar + Commons-poo L-1.5.6.jar C3P0 Required Package C3p0-0.9.1.2.jar database package Mysql

"); datasource.setuser ("root"); Datasource.setpassword ("root"); String sql= "INSERT into Sw_user (Username,password) VALUES (?,?)"; int count=jdbctemplate.update (SQL, "Bullet", "War hero Song"); if (count==1) {return true; } return false; } } The object in Userdao to use JdbcTemplate, which is also injected through the configuration file XML, requires Setjdbctemplate () to match The JdbcTemplate object also needs to inject datasource object

A problem has recently occurred in a project: The system uses the SPRING+C3P0 to manage the connection pool for the database, with a total of 4 data sources in the project. When you start a project, if one or more of the data sources are not connected, the background attempts to connect indefinitely, causing the entire project to fail to start. In fact, the result we want is that if a data source cannot be connected, skip the connection to the data s