The SQL Server 2016 Query Store: Analyzing Query Store Performance
There are some obvious advantages to having the Query Store, but what is the performance impact that it is likely to have on a busy OLTP database server? It is early days, of course and until we get more experience we have to rely on Microsoft's estimate of a performance impact of 3-5% on average. However, this will depend on a number of factors such as usage an the way it is configured. Enrico explores some of these factors in order to give a clearer picture of what you should expect.
Adding PK Exceptions to SQLCop Tests
In this piece, Steve Jones shows how you can enforce a requirement of a Primary Key (PK) with a unit test, but also allow exceptions where needed.
Solving Tempdb Issues
A simple change might solve some of those tempdb issues various customers experience.
Performance Surprises and Assumptions : DATEADD()
Aaron Bertrand explores yet another scenario where a date/time function seems to cause the optimizer to behave unexpectedly.
Use Tools
One of the great things about IT is that we have so many tools to help us do our jobs. We can even build tools as needed. So why don't more IT people take advantage of this?
A Lifetime of Software
Today Steve Jones wants you to look forward in your career. Do you enjoy working with software and technology? Do you plan on doing this for the rest of your career?
Data Mining Part 40: Big Data and Microsoft Data Mining
This article will introduce about big data and HDInsight and Hadoop.
SQL Server Security Audit Basics
SQL Server Server Audit has grown in functionality over the years but it can be tricky to maintain and use because it lacks centralization and analysis tools. It can do a fast and lightweight audit of many different activities including DML and DDL at both Instance and Database Levels - even the work of the DBAs. How do you check logins and permissions? How do you script an enterprise-wide audit solution? How can you hope to analyse the log data you get? Feodor Georgiev gets you started.
Blogs
AI Helps Me with My Sloppiness
By Steve Jones
I type fairly well. Well, I type fast, but I do wear out a...
WITH clause gets a 26ai boost!
By way of background, a while back I did video called “My New Favourite...
Automatic Index Compaction
By ReviewMyDB
Index maintenance has always meant nightly jobs and a window you have to defend....
Forums
SQL Art, Part 4: Happy 4th of July — A British DBA's Guide to Celebrating a War We Don't Talk About
Comments posted to this topic are about the item SQL Art, Part 4: Happy...
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Question of the Day
Getting the Average
I have this data in the dbo.Commission table in a SQL Server 2022 database.
salesperson commission Brian 12 Brian 16 Andy 7 Andy 14 Andy 21 Steve 20 Steve NULLAll the data is a varchar, and I decide to run this query to get the totals for each salesperson.
SELECT SalesPerson
, AVG(TRY_PARSE(Commission AS int)) AS TotalCommission
FROM commission
GROUP BY SalesPerson
GO
What average commission is calculated for Steve? See possible answers