Persisting statistics sampling rate

Cross post with http://aka.ms/sqlserverteam When SQL Server creates or updates statistics and a sampling rate is not manually specified, SQL Server calculates a default sampling rate. Depending on the real distribution of data in the underlying table, the default sampling rate may not accurately represent the data distribution and then cause degradation of query plan…


New in SSMS: Searching in Showplan

Cross post with http://aka.ms/sqlserverteam Have you ever analyzed a somewhat big plan? And while doing so did you ever wish you could search for something like table name, index name or column name? In SSMS 17.2, we are including the ability to search all these and more in graphical showplan. Let’s look at an example….


New in SSMS: Performance Dashboard built-in

Cross post with http://aka.ms/sqlserverteam Back in 2007, we released the Microsoft SQL Server 2005 Performance Dashboard Reports, which were designed to provide fast insight into performance issues from some newly created system views – DMFs (Dynamic Management Views). These were updated for SQL Server 2008 and later to SQL Server 2012, and while being very…


Correlating xEvents with DMVs

Cross post with http://aka.ms/sqlserverteam Since the inception of xEvents there has been the need to occasionally correlate data from xEvent collections and DMVs. Specifically, using the query_hash and query_plan_hash actions and correlate with DMVs such as sys.dm_exec_requests and sys.dm_exec_query_stats for example. The blog post on Correlating XE query_hash and query_plan_hash to sys.dm_exec_query_stats in order to…