When Page Prefetching Takes a Back Seat – Exploring Trace Flag 652 in SQL Server
Learn how a trace flag affects SQL Server reading from disk and where this might be a useful thing for you to enable.
2025-09-24
2,564 reads
SQL Server internal storage
2025-05-16
644 reads
2025-01-15
1,886 reads
What happens when we drop a column on a SQL Server table? Where's my space?
You have dropped a column and wondering why you haven't recovered any space? Let's take a look.
2024-08-01 (first published: 2024-04-26)
5,206 reads
Identify Tables With Dropped Columns
How easily can we find tables with dropped columns that need cleanup?
2024-06-07
2,707 reads
2024-04-10
496 reads
Understanding CRUD Operations on Tables with B-tree Indexes, Page-splits, and Fragmentation
Introduction Every DML transaction reads the data before it makes any changes. Not only during a SELECT query, but when you run any DML statement, insert, update, or delete, SQL Server first fetches a bunch of pages into the buffer pool locating the desired rows and changes them while synchronously writing to the transaction log […]
2021-05-10
9,106 reads
Understanding CRUD Operations Against Heaps and Forwarding Pointers
In this article, we examine how data changes are made against heaps.
2021-05-03
4,980 reads
Understanding the Internals of a Data Page
In Part 1 of this series, we examine the structure of data pages and how your tables are stored on these pages.
2021-04-13
21,223 reads
2020-06-26
666 reads
Blogs
Are Blogs Still Relevant? I Think They Still Are.
As for me, I'll keep writing whenever time permits. I don't expect every post...
Reading Blogs: T-SQL Tuesday #204
By Steve Jones
This is an interesting invitation this month. Jeff Ianucci is a new host, and...
Are Blogs Still Relevant? - T-SQL Tuesday #204
By alevyinroc
T-SQL Tuesday is a monthly blog party hosted by a different community member each...
Forums
Pay for Performance
Comments posted to this topic are about the item Pay for Performance, which is...
Slow - Linked server query
Hi I have this slow query that is pulling data from a linked server....
Too Many Choices
Comments posted to this topic are about the item Too Many Choices
Question of the Day
Too Many Choices
I have a table, dbo.MasterBrands, with this data:
BrandID OfficialName 1 Samsung 2 Apple 3 Microsoft 4 Adidas 5 Coca-ColaI run this query. What is returned for Coca-Cola?
SELECT CHOOSE(BrandID, 'Conglomerate', 'Tech and Design', 'Desktop', 'Apparel') FROM dbo.MasterBrands;See possible answers