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What is connection pooling and what is the maximum Pool Size in ADO.NET Connection String?

Posted By :Swati Kadam     Posted Date :September 17, 2014    Points :40   Category :ADO.Net 
A connection pool is created when a connection is opened the first time. The next time a connection is opened, the connection string is matched and if found exactly equal, the connection pooling would work.
Otherwise, a new connection is opened, and connection pooling won't be used.
Maximum pool size is the maximum number of connection objects to be pooled.
If the maximum pool size is reached, then the requests are queued until some connections are released back to the pool. It is therefore advisable to close the connection once done with it.

You can also find related Interview Question to What is connection pooling and what is the maximum Pool Size in ADO.NET Connection String?  below: 

Where do you store connection string?

  
Database connection string can be stored in the web config file.
The connection string can be stored in the WEB.Config file under
element. (More...)

What does connection string consist of?

  
The connection string consists of the following parts:
In general:

Server: Whether local or remote.

Uid: User Id (sa-in sql server)

Password: The required password to be filled-in here

Database: The database name. (More...)

How you will write a Connection String in web.Config fiel?

  
Ans) Then write below lines of code:

configuration>
connectionStrings>
add name="sqlconnectionstring" connectionString="Data Source=INTHIYAAZ;Initial Catalog=DB;User ID=sa;Password=sa" />
/connectionStrings>
/configuration>
(More...)

To perform asynchronous data access, what must be added to the connection string?

  
Select Correct Answer.

1. BeginExecute=true
2. MultiThreaded=true
3. MultipleActiveResultSets=true
4. Asynchronous=true

Correct Answer:
4. Asynchronous=true (More...)

Is it possible to update a connection string stored in the Web.config file programatically? If Yes, then how?

  
Yes.

Create a Configuration object. Then, update the connection string using the ConnectionStrings collection. Finally, call Configuration.Save. (More...)

Does ADO.NET supports automatic connection pooling?

  
Yes.

There is a pooling property with connection string. By default it is set to true.
Use this property to specify that a particular connection should not participate in the pool, but instead should be destroyed when it is closed. (More...)

What is Connection Pooling ?

  
Connection Pooling will make a single connection instance, which allows that instance to connect to all the databases. Advantage is that it does not open and close the connection object multiple times. (More...)

What is Connection Pooling

  
Connection pooling is of

· A Connection Pool is a container of open and reusable connections. A Connection Pool is released from the memory when the last connection to the database is closed.

· The Data Providers in ADO.NET have Connection Pooling turned on by default; if you need to turn it off, specify Pooling = false in the connection string being used.

· Connection Pooling gives you an idle, open, reusable connection instead of opening a new one every time a connection request to the database is made. When the connection is closed or disposed, it is returned to the pool and remains idle until a request for a new connection comes in.

· The pool can house connections up to the maximum limit as specified in the connection string that was used to connect to the database.


(More...)

What is Connection Pool Manager

  
A Connection Pool is maintained internally by the Connection Pool Manager. When a request for a subsequent connection comes in, the Connection Pool Manager searches the pool for the availability of a free connection and returns it to the application if one is available. Connection Pools works as below

· If any unused connection is available, it returns one.

· If all connections are used up, a new connection is created and added to the pool.

· If the number of connections reaches the maximum number of connections in the pool, the requests are queued until a connection becomes free for reuse.

(More...)

Parameters used in Connection pooling

  
Connection Pooling is controlled and the parameters passed to a connection string comprises the following:

· Connect Timeout

· Min Pool Size

· Max Pool Size

· Pooling

(More...)

Adv and Disadv of using Connection Pooling

  
Advantage of using Connection Pooling is an improvement of performance and scalability

Disadvantage is that one or more database connections, even if they are currently not used, are kept open
(More...)

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