Prefetching can make a surprising difference to SQL Server query execution times where there is a high incidence of waiting for disk i/o operations, but the benefits come at a cost. Mostly, the Query Optimizer gets it right, but occasionally there are queries that would benefit from tuning.
The design pattern described in this article can be used to develop very efficient CDC operations in large scale implementations.
With all the recent worms and attacks out there, it's only a matter of time before someone focuses more on databases. With that in mind, Steve Jones thinks it's important we learn and use encryption and better security now.
After designing several SSRS reports based on regular relational databases, your boss would now like several new reports to be designed and rolled out to production based on your organization's SSAS OLAP cube. How do you get started with designing a report based on a cube?
A free day of training in Davie, FL this weekend. Come by if you can
Is it worth writing your own software? Steve Jones says you ought to really think about it and perhaps spend time looking to buy something before you build a new application.
If you are trouble-shooting an AlwaysOn Availability Group topology, a study of the wait statistics will give a pointer to many of the causes of problems. Although several wait types are documented, there is nothing like practical experiment to familiarize yourself with new wait stats, and Joe Sack demonstrates a way of testing the sort of waits generated by an availability group under various circumstances.
Our 19th webinar will feature Brad McGehee talking about storage challenges, costs, and potential solutions for better managing your data. Tuesday, June 12, at 4:00pm GMT.
This editorial that was originally published on Aug 15, 2007. It is being rerun as Steve is traveling. This editorial looks at the issues that happen in production and how you should perhaps plan for disasters.
The Database Recovery Advisor in SQL Server 2012 will aid the ability of DBAs to recover their databases to a point in time in a crisis. Read about this new feature and how it can speed the process of recovery.
By Steve Jones
I type fairly well. Well, I type fast, but I do wear out a...
By ReviewMyDB
Index maintenance has always meant nightly jobs and a window you have to defend....
I’m sure you’ve all heard the tale of Goldilocks and the Three Bears, but...
Comments posted to this topic are about the item SQL Art, Part 4: Happy...
Comments posted to this topic are about the item How We Handled a Vendor...
Comments posted to this topic are about the item Cognitive Coverage
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