QuestPond: Interview Questions and Answers on ADO.NET

Can you explain the term concurrency?

Concurrency issues happen in multiuser environment when multiple people update the same data at the same time.

Below is the sequence of events how concurrency issues can happen:-

  • User A fetches data with value “X” and starts changing this value to “Y”.
  • User B also fetches the same “X” data and starts changing this value to “Z”.
  • Now User B first updates the data to database. In other words he changes the data to “Z”.
  • Now User A also sends the update to database. In other words he changes the data to “Y”.

Now User A thinks he has changed “X” to “Y” and User B thinks the current data is “Z”. Both of them are wrong and this leads to confusion termed as “Concurrency” problem.

How can we resolve concurrency issue?

Concurrency issue can be resolved by using optimistic or pessimistic locking. 

See following video on ADO.NET Connection pooling: –

 

Click and see here on Online resource for learning ADO.NET


Advertisements

About c# and .NET Interview questions

This blog is for developers who want to crack .NET and C# interviews. It has all tips and tricks needed to crack .NET interviews , C# interview , SQL Server interview , Java interview , WCF Interview , Silverlight interview , WPF interview , LINQ interview , Entity framework Interview. Do not forget to watch our Learn step by step video series. Learn MVC in 16 hours:- https://www.youtube.com/watch?v=Lp7nSImO5vk Learn AngularJS Step by Step:- https://www.youtube.com/watch?v=0kmdjqgO9IY Learn Design Pattern in 8 hours:- https://www.youtube.com/watch?v=YDobmucohqk Learn C# and .NET in 60 days:- https://www.youtube.com/watch?v=yh2SrzCkNQA Learn MSBI in 32 hours:- https://www.youtube.com/watch?v=mGPJx3ocFgg Learn SharePoint Step by Step in 8 hours:- https://youtu.be/C2fW76SwJNU
This entry was posted in Uncategorized and tagged , , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s