OracleConnectionCacheImpl violating MAX_LIMIT

Question

Hi,
I am using OracleConnectionCacheImpl for conection pooling in my application. I have set the Min and Max limits as 30 and 100 respectively. I am using DYNAMIC_SCHEME for connection pooling.
But whenever there is heavy load on my application the number of conections is exceeding the MAX_LIMIT of 100. So in a way the OracleConnectionCacheImpl does not seem to be taking care of the MAX limit on the number of conections.
And the application reaches to a point where it does n't seem to recover the unused connections. Is it anything to do with the scheme that we are using?
Please help. Thanks in advance ..:-)

Answer 1

JDBC (on a JSP for instance) will usually do the query and close the connection when the command close() is called. However, this doesn't mean that the connection is closed at the database. Since there's no wait, or no resources being used anymore by the connection, the connection goes to INACTIVE state.
If you are inside Oracle's intranet, take a look at this:
http://bigbird.us.oracle.com:7777/dbadmin/session_test.jsp
This page queries the sessions table on a database (using a cached connection). Each time you refresh the page, you see a new inactive session (used to generate the previews page), and a new ACTIVE session used to generate the current page. You'd think the cached connection (bean) would always use the same connection. But it doesn't. Hit REFRESH on the browser 20 times and you will see 20 INACTVE connections from LUCIO @ bigbird.
The MAX limit is set to 150. But since those 20 inactive sessions have no jobs waiting, before you get to 150 sessions on the list, a bunch of them will suddenly disappear, as they are automatically released so the Database can allocate resources to new sessions.
If you are getting the MAX sessions reached error, make sure you issue the close() function from your Connection object in every JDBC application that creates a new session. If you don't, they will accumulate as active sessions and won't be released.