Static class to get connections from connection pool

Content Index :

Static class to get connections from connection pool
Glassfish Derby Connection Pool, Connections not returned to the pool
Connection pool opens more connections then maximum pool size
IIS SQL Server: Connection Pool: Why are new connections made instead of reusing existing connections?
Connection Java Class to a Derby Database increase performance of the pool connections
How to track/log connections in tomcat dbcp pool and detect code that does not return connection to the pool

Static class to get connections from connection pool

Tag : java , By : Matt Leacock

Date : November 27 2020, 03:01 PM

Hope that helps Each JNDI lookup returns a new instance of DataSource. Each DataSource instance maintains it's own pool of connections.
See tomcat implementation of Datasource.getConnection() below:,

public Connection getConnection() throws SQLException {
    if (pool == null)
        return createPool().getConnection();
    return pool.getConnection();
}

private synchronized ConnectionPool pCreatePool() throws SQLException {
    if (pool != null) {
        return pool;
    } else {
        pool = new ConnectionPool(poolProperties);
        return pool;
    }
}

Comments

No Comments Right Now !

Boards Message :

You Must Login Or Sign Up to Add Your Comments .

Share :

Tags :

Static class to get connections from connection pool , Connection Java Class to a Derby Database increase performance of the pool connections , How to track/log connections in tomcat dbcp pool and detect code that does not return connection to the pool , IIS SQL Server: Connection Pool: Why are new connec ,

Glassfish Derby Connection Pool, Connections not returned to the pool

Tag : java , By : IanM

Date : March 29 2020, 07:55 AM

this will help Its always the first guess, that connections are not returned to the pool due to lack of cleaning up.
Make sure that:

try
{
  //open
  //work
}
catch
{
  //exception handling
}
finally
{
  //close
}

Connection pool opens more connections then maximum pool size

Tag : oracle , By : user158220

Date : March 29 2020, 07:55 AM

seems to work fine 1t try to compare output from netstat on appl. server and db server side. You may have some "dangling" connections. Also try to find some documentation about DCD (Dead connection detection) in Oracle.
Few years ago I saw situations where Java application server thought that the connection is dead because it is not responding for few minutes. So this connection was put onto some dead connection list and a new connection was created.

IIS SQL Server: Connection Pool: Why are new connections made instead of reusing existing connections?

Tag : sql-server , By : RichAA

Date : March 29 2020, 07:55 AM

I hope this helps you . If the connections are coming from a different machine, the connections can't be pooled. A connection required both endpoints to be a connection. If you are using connection pooling correctly, applications instantiate a connection (from the pool), use the connection, then drop it as soon as exchange is complete.
If you a writing a single-threaded desktop app, another common and simple strategy is to open a connection, and just leave that connection open as long as the application is running.