Thread Synchronization in SQL Server

Any code optimized for highly concurrent workloads must worry about thread synchronization. SQL Server is no exception, because in a database system, synchronization is one of the core functionalities you rely on the engine to provide (the noSQL crowd may ponder that a bit). In this blog post, I will describe the synchronization primitives, like locks, latches and spinlocks, used by SQL Server to coordinate access to memory regions between threads.

An Interesting Blog to Follow

I know some of you track Conor Cunningham’s blog, which I highly recommend. The information on query optimizers is rather sparse out there – and it is a real privilege when people who know what they are talking about share their information freely on a blog. There are just not that many of them.

Here is something to think about in that context: Even if you are only interested in SQL Server, there are good things to be learned from studying other database engines – they are after all very similar. One of the good blogs for that purpose is the Oracle optimizer blog: http://blogs.oracle.com/optimizer/. It is delightfully free from marketing, and packed with good stuff. Don’t worry about the fact that they like textual query plans over there in Oracle. You might be used to viewing plans graphically, but I am sure you agree that such minor difference in display preferences can be set aside in the name of reading good material.