如何缩小数据库连接池？

Question

I am using Apache DBCP with JNDI in my tomcat container to pool connections to a mysql database. Everything works fine but a problem i am seeing is that once a pconnection is pooled it is never released. So after a load spike connection sit their forever sleeping. Is their a way to shrink the pool through context.xml parameters? here is my ocnfiguration:

        defaultAutoCommit="false"
        defaultTransactionIsolation="REPEATABLE_READ"
        auth="Container"
        type="javax.sql.DataSource"
        logAbandoned="true" 
        removeAbandoned="true"
        removeAbandonedTimeout="300" 
        maxActive="-1"
        initialSize="15"
        maxIdle="10"
        maxWait="10000" 
        username="user"
        password="password"
        driverClassName="com.mysql.jdbc.Driver"
        url="jdbc:mysql://localhost/mydb"/>

Answer 1

尝试将minEvictableIdleTimeMillis设置为低于其默认值1000*60*30 。

Answer 2

尝试使用c3p0连接池`~~

Answer 3

In comparable situations I've used Tomcat's JMX adapter to tweak the settings of the connection pool. This can be used both, to increase and to decrease thesize of the pool. It is therefore a good idea to enable JMX remote access to the servlet container at least in production environments, just to have some chance to react on exceptional operational situations.