ADAPTIVE QUERY PROCESSING IN SQL SERVER 2017 The next release of Microsoft SQL Server, announced as SQL Server 2017, is available for download in CTP2 at http://tinyurl.com/SQLvNextLinux and offers many cool new features. One set of features that I really like to focus on is adaptive query processing. These new features speed processing of workloads, especially those that have historically been the hardest to tune. READ MORE... Originally Posted July 05, 2017 … [Read more...]
ICYMI: Parameter Sniffing, Friends with Partition Benefits, and SELECT INTO Parallelism – SQL Server Performance
April 6, 2015 by 2 Comments
Great topics for further reading about tuning SQL Server performance: Exploring SQL Server 2014 SELECT INTO Parallelism Joe Sack (b | t) provides us with a peak into the performance improvements and new behaviors of SQL Server 2014 in the way it can now parallelize large SELECT INTO operations. Parameter Sniffing, Embedding, and the RECOMPILE Options Parameter sniffing is a term used to describe the processes by which SQL Server attempts to reuse execution plans where certain parameters might frequently change. If you’re only familiar in passing with the term, it probably has … [Read more...]
ICYMI: Partitioning Advice, Purging Data Bloat, and an example of TVF Misbehavior – SQL Server Performance
March 30, 2015 by Leave a Comment
Here are some oldies, but goodies that I recommend you read: Two Partitioning Peculiarities and Aggregates and Partitioning Most of us know that partitions are one of the best ways to scale very large databases or very large IO workloads. However, there are risks, two of which are explored in detail by internals master Paul White (b | t). The Price of Not Purging Holding on to data long after its useful lifespan contributes to bloat and added preventative maintenance headaches. Read this informative post from Erin Stellato (b | t), of SQLSkills.com, where you’ll find a lot of useful … [Read more...]
ICYMI: Query Optimization Phases, Observer Overhead, and Secrets of SP_Updatestats – SQL Server Performance
March 23, 2015 by Leave a Comment
Do you do a bit of query tuning? Then check out this treasure trove of performance tuning advice! Optimization Phases and Missed Opportunities and Working Around Missed Optimizations Paul White (b | t) writes two fascinating blog posts that go hand-in-hand concerning query optimization. He goes into some deep details about how the query optimizer works, comparing various versions of SQL Server, and shows you several useful ways to assess query performance. Plus, there’s one handy trace flag too! Observer Overhead and Wait Type Symptoms Joe Sack (b | t) does a deep dive on … [Read more...]
The SQL Sentry forum for SQL Statement Tuning
February 25, 2015 by Leave a Comment
The SQL Sentry forum for SQL Statement Tuning Have you ever looked at our community site specifically dedicated to helping users tune their SQL queries, http://answers.SQLPerformance.com? You can easily upload an execution plan directly from our free Plan Explorer tool or from good ol' SQL Server Management Studio to the discussion forum. Once uploaded, our internal team and forum members will provide plenty of tips and input on how to improve the plan and/or explain what the plan is actually doing. The renown SQL execution plan expert, Paul White (b|t), is the moderator of the site. But … [Read more...]
