Statistics and the Ascending Key Problem
I’ve mentioned previously how not having up to date statistics can cause problems in query performance. This post looks at something called the Ascending Key Problem which can badly...
2021-02-09
184 reads
Matthew McGiffen DBA
What are Statistics in SQL Server?
Statistics are vitally important in allowing SQL Server to find the most efficient way to execute your queries. In this post we learn more about them, what they are...
2021-03-24 (first published: 2021-02-01)
401 reads
Rowcount estimates when there are no Statistics
When you don't have statistics, what does SQL use to calculate the estimated number of rows?
2021-02-04 (first published: 2021-01-26)
297 reads
When do Statistics get updated?
Statistics objects are important for allowing the SQL Server Optimizer to make good estimates and form efficient execution plans. Related to that it's useful for us to understand when...
2021-01-25 (first published: 2021-01-18)
503 reads
How does Query Store capture cross database queries?
Query Store is a configuration that is enabled per database, and the plans and stats for queries executed in that database are stored in the database itself. So what...
2021-01-18 (first published: 2021-01-11)
473 reads
Identify the (Top 20) most expensive queries across your SQL Server using Query Store
Script to identify the most expensive queries on your database server using the Query Store DMVs. This allows you to look at data from a specific time frame, as...
2021-01-11 (first published: 2021-01-04)
695 reads
SQL Puzzle – Eight Queens on a Chess board
Here's a SQL Puzzle for the festive period. 2020 has been a year of many things but amongst it all, it has been the year of chess. The combined...
2020-12-24 (first published: 2020-12-15)
537 reads
Introduction to SQL Server Query Store
Introduced with SQL 2016, Query Store was, probably without doubt, the most anticipated and talked out new feature. In this post we'll just take a brief look at it,...
2020-12-21 (first published: 2020-12-14)
935 reads
TDE in Standard Edition on SQL 2019
Recently Microsoft quietly let us know that TDE (Transparent Data Encryption) will be available in the Standard Edition of SQL Server 2019. If you don’t follow SQL topics on...
2019-11-12 (first published: 2019-11-05)
7,127 reads
Why Does Everyone Have More Friends Than You?
No, the answer isn’t because you’re a DBA. This isn’t a technical post about databases, but rather a discussion of a statistical paradox that I read about recently. Statistics...
2019-10-01
40 reads
Blogs
Fabric Mirroring doesn’t start copying Rows
A short blog post about an issue with Fabric Mirroring (with Azure SQL DB...
JSON_OBJECTAGG is an Aggregate: #SQLNewBlogger
By Steve Jones
I wrote an article recently on the JSON_OBJECTAGG function, but neglected to include an...
Cultural Change: Fostering a Cost-Aware Culture in Your Organisation
By HeyMo0sh
After working deep in cloud operations, I’ve learned that FinOps isn’t really about dashboards...
Forums
Breaking SQL Server for disaster recovery practice
Hey all. I understand if this gets taken down due to the subject matter...
Creating a JSON Document I
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Who is Irresponsible?
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Question of the Day
Creating a JSON Document I
I want to create a JSON document that contains data from this table:
TeamID TeamName City YearEstablished 1 Cowboys Dallas 1960 2 Eagles Philadelphia 1933If I run this code, what is returned?
SELECT json_objectagg('Team' : TeamName)
FROM dbo.NFLTeams;
See possible answers