When do Distribution Statistics Get Updated?
Statistics objects are important to us for allowing SQL to make good estimates of the row-counts involved in different parts...
2017-07-05
770 reads
Matthew McGiffen DBA
Row-count Estimates when there are no Statistics
I was discussing Cardinality Estimation with a colleague recently and the question came up, what cardinality does SQL Server use...
2019-04-26 (first published: 2017-06-28)
2,877 reads
Statistics and Cardinality Estimation
Cardinality
This is a term originally from Mathematics, generally defined as “The number of objects in a given set or grouping”....
2019-04-26 (first published: 2017-06-20)
5,805 reads
What’s an “Index” and how do they work?
What is an Index?
We often hear indexes explained using the analogy of an index in the back of a book....
2017-06-12
1,580 reads
SQL Puzzle 1: Magic Squares
This is the first in what I hope will be a semi-regular series of recreational puzzles where SQL can be...
2017-06-07
1,569 reads
Working with Data in Always Encrypted
In this post we’re going to create some encrypted columns in a table in a test database and look at...
2017-06-06
10,613 reads
Statistics Parser
In the last post we looked at using the STATISTICS IO and STATISTICS TIME commands to measure query performance.
If you’ve...
2019-04-26 (first published: 2017-05-31)
2,359 reads
Understanding Keys and Certificates with Always Encrypted
Always Encrypted on SQL 2016 is pretty easy to set up. There’s even a single wizard to guide you through...
2019-04-26 (first published: 2017-05-30)
8,477 reads
Tuning Parallelism on SQL Server
Parallelism and MAXDOP
There’s no doubt that parallelism in SQL is a great thing. It enables large queries to share the...
2017-05-26
5,296 reads
Measuring SQL Query Performance
When running workshops on the subject of SQL Query Performance the first question I always ask is how do we measure...
2019-04-26 (first published: 2017-05-24)
36,416 reads
Blogs
Tooling for Success: The Best FinOps Tools and Technologies
By HeyMo0sh
As a DevOps person, I know that to make FinOps successful, you need more...
From Planning to Practice: Setting Up Your FinOps Framework
By HeyMo0sh
As someone who works in DevOps, I’m always focused on creating systems that are...
“We love to debate minutiae”
By Brian Kelley
I am guilty as charged. The quote was in reference to how people argue...
Forums
Restoring On Top II
Comments posted to this topic are about the item Restoring On Top II
SQL Art 2: St Patrick’s Day in SSMS (Shamrock + Pint + Pixel Text)
Comments posted to this topic are about the item SQL Art 2: St Patrick’s...
Breaking Down Your Work
Comments posted to this topic are about the item Breaking Down Your Work
Question of the Day
Restoring On Top II
I have a database, DNRTest, that has a number of tables and other objects in it. The other day, I was trying to mock up a test and ran this code on the same server:
-- run yesterday CREATE DATABASE DNRTest2 GO USE DNRTest2 GO CREATE TABLE NewTable (id INT) GOToday, I realize that I need a copy of DNRTest for another mockup, and I run this:
-- run today USE Master BACKUP DATABASE DNRTest TO DISK = 'dnrtest.bak' GO RESTORE DATABASE DNRTest2 FROM DISK = 'dnrtest.bak' WITH REPLACEWhat happens? See possible answers