what are design patterns & connection pool?

When we are talking about application.Database connection is most important and resource buring task. Opening database connection is time consuming and may be verys slow task.Most of the applications need to execute any query on the database server, a connection need to be established. Connection pooling increases the performance of the applications by reusing the active database connections instead of create new connection for every request. To know more view below link
http://www.getproductprice.com/Ads-what-is-connection-pooling-and-its-parameter.aspx