Recently a customer asked me to check why a load process from a banking application has so poor performance.In fact this process is extremely slow, between 40 minutes up to more than one hour to load around 240’000 rows. As the application is a black box for my customer I have first to find out which queries are running during…
The latest Cumulative Update for SQL Server 2019 has been released this week on Monday. It brings many bug fixes and some small improvements. One of these improvements is the addition of an extended event to identify the users forcing or unforcing an execution plan via the Query Store. In this blog post, I will test this new XEvent. For…
Earlier this month, dbi services hosted a free multi-technology event. Details are available on our website. I had the opportunity to present a session about the Query Store and the Automatic Tuning feature available on SQL Server and Azure SQL Database. The first session in Lausanne was in French. A week later in Olten, I did it again in English.…
For our event SQL Server 2016 in September, I am studying the new functionality Query Store. My colleague David Barbarin have written few months ago about Query Store and how it’s working. Simple SELECT Query To begin, I execute a simple SELECT on a table with 3 different methods: SELECT * FROM QS_test; exec sp_executesql N’SELECT * FROM QS_test’ EXEC…
One of the most new interesting features that will be introduced by SQL Server 2016 is certainly the query store that will complete the performance tuning toolbox of database administrators. Basically, the query store will track queries, their query plans and runtime statistics as well. It will be a great tool to detect regressing queries. I remember a real customer…
