connection-pooling

问题 What is the difference between org.apache.commons.dbcp BasicDatasource and PoolingDataSoure? Do both support pooling of connections? When to use each of them ? 回答1: BasicDataSource is, as the javadoc says, a one-stop shopping for basic needs. It has all the necessary. It creates internally a PoolableDataSource and an ObjectPool. PoolingDataSource implements the DataSource interface using a provided ObjectPool. PoolingDatasource take cares of whatever has to do with connections (casting,

问题 please tell me. How can I configure the "Hikari connection pooling + Hibernate 4.3.8 + Spring Data JPA configuration"? Here is my configuration, but for some reason I am sure that this configuration is not correct. Because the the console does not appear anything like the "connetction pooling". On the Internet I can not find the tutorial for the beginner. Thanks. <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" p:dataSource-ref=

问题 ​What is the proper way of using connection pools in a streaming pyspark application ? I read through https://forums.databricks.com/questions/3057/how-to-reuse-database-session-object-created-in-fo.html and understand the proper way is to use a singleton for scala/java. Is this possible in python ? A small code example would be greatly appreciated. I believe creating a connection perPartition will be very inefficient for a streaming application. 回答1: Long story short connection pools will be

问题 I am implementing connection pooling in project. Performance wise which is better approach to do it? Hibernate (using C3PO or DBCP) Configuring JDBC data-source in Application server. Application server Portability is not an important factor for me. Please suggest the approach. 回答1: Connection pooling is implemented in the DataSource, and in both case Hibernate will use a datasource. The question is which data source implementation is used, and how is it configured: You can specify and

问题 I've got a J2EE application which uses JSP pages as front end and Struts2 as controller. I also use Hibernate to map my objects into a MySql DB. when I deploy the application on the server It works fine but after an unpredictable period of time (like 1 or two days) wherever I've used hibernate queries I keep getting this error: org.hibernate.exception.JDBCConnectionException: could not execute query what makes it more interesting is the fact that when this situation happens, it's not like 100

问题 I've got a J2EE application which uses JSP pages as front end and Struts2 as controller. I also use Hibernate to map my objects into a MySql DB. when I deploy the application on the server It works fine but after an unpredictable period of time (like 1 or two days) wherever I've used hibernate queries I keep getting this error: org.hibernate.exception.JDBCConnectionException: could not execute query what makes it more interesting is the fact that when this situation happens, it's not like 100

问题 I'm using the tomcat connection pool via JNDI resources. In the context.xml : <Resource name="jdbc/mydb" auth="Container" type="javax.sql.DataSource" username="myusr" password="mypwd" driverClassName="com.mysql.jdbc.Driver" maxActive="1000" maxIdle="100" maxWait="10000" url="jdbc:mysql://localhost:3306/mydatabase" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" /> In web.xml : <resource-ref> <description>DB Connection</description> <res-ref-name>jdbc/mydb</res-ref-name> <res-type

问题 We are running an AWS RDS Aurora/MySQL database in a cluster with a writer and a reader instance where the writer is replicated to the reader. The application accessing the database is a standard java application using a HikariCP Connection Pool. The pool is configured to use a "SELECT 1" test query on checkout. What we noticed is that once in a while RDS fails over the writer to the reader. The failover can also be replicated manually by clicking "Instance Actions/Failover" in the AWS

问题 I have written following properties in my configuration files I am using Log4j in my application When I am running a project. I am getting following message.does that mean connection pooling is configured in my project? if not then how it will be? INFO: internal.ConnectionProviderInitiator - HHH000130: Instantiating explicit connection provider: com.zaxxer.hikari.hibernate.HikariConnectionProvider I have referred following link also link here Datasource settings hibernate.datasource.driver

问题 I have written following properties in my configuration files I am using Log4j in my application When I am running a project. I am getting following message.does that mean connection pooling is configured in my project? if not then how it will be? INFO: internal.ConnectionProviderInitiator - HHH000130: Instantiating explicit connection provider: com.zaxxer.hikari.hibernate.HikariConnectionProvider I have referred following link also link here Datasource settings hibernate.datasource.driver