Depending on the application you're running, you may not need to use a database-level connection pooler. Some programming models include what's referred to as an application server, an idea popularized by Java. Popular application servers for Java include Tomcat, JBoss, and others. The Java database access library, Java Database Connectivity (JDBC), includes support for connection pooling. Put those together, and you might get efficient database connection pooling without adding any more software to the mix. Tomcat calls this its database connection pool (DBCP). A longer list of open source pooling software is available at http://java-source.net/open-source/connection-pools and commercial vendors selling application ...
Application server pooling
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