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Locks in SQL Server

Dan Jackson provides us a primer on how SQL Server implements locking:

We have all heard of locks and can probably even name a few; shared or exclusive locks, for example. We notice them more when something goes wrong and we run into blocking or other performance problems, but what are locks and how do they work in SQL Server?

In this blog, I aim to give a basic answer to that question and provide you with an overview of the different lock modes in SQL Server and how it all works…

Let us make it clear from the off; locks are an essential part of SQL Server. In a multi-user system, there will be many users who wish to access the same resources at the same time. This means that SQL Server must have measures in place to handle concurrency and prevent adverse side effects. Locking is one of those measures.

Read the whole thing.