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What happens if Database Connections not closed?

yamini nadella
Ranch Hand

Joined: Apr 13, 2004
Posts: 257
I have a java application and Sql server database. In java application I am opening a database connection and not closing that DB connection. According to my understanding once we exit java application then all opened database connections from this application will be closed automatically. Is it not?
Bear Bibeault
Author and ninkuma
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Joined: Jan 10, 2002
Posts: 60789
    
  65

Even if they are, do you really think that's a good idea?


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Jeffrey Hunter
Ranch Hand

Joined: Apr 16, 2004
Posts: 305
Not from my experience. Even after our application exited normally, we noticed several JDBC thin clients still connected to the Oracle DB. These were instances where developers overlooked closing connections, or failed to control for exceptions. I think the safe, simple rule to follow is: close all your connections explicitly.
Jeanne Boyarsky
internet detective
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Joined: May 26, 2003
Posts: 30130
    
150

Yamini,
According to my understanding once we exit java application then all opened database connections from this application will be closed automatically

First of all, I agree with everyone who has said to close the connection. It is a good habit and important to do.

The connection being closed isn't tied to the application exiting though. It is tied to the database connection timeout. When a connection hasn't been used in a certain length of time, it can (sometimes) be recovered. The connection pool does not know whether the application has exited.


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