Which Columns Are Looked Up?
A common issue in performance is the lookup, key or RID, but the question frequently asked is, which columns are looked up? You need to know in order to...
2022-02-07 (first published: 2022-01-24)
435 reads
Grant Fritchey
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Two Clustered Indexes?
Everyone knows that you only get a single clustered index, right? Wouldn’t it be great though if you could have two clustered indexes? Well, you can. Sort of. Let’s...
2022-01-31 (first published: 2022-01-18)
447 reads
Model Good Behavior
I'm answering a question in the forums and I spot something that crawls up my spine: ;WITH... The person was using a Common Table Expression (CTE) which requires that the preceding statement in the batch have a statement terminator, the semi-colon. However, since the terminator isn't required everywhere, lots of people don't use it at […]
2022-01-29
141 reads
Why Is “WHERE 1=0” Slow?
I saw a question the other day, questioning why they’re creation of temporary tables was so slow. What they were doing was (a much more complicated version of) this:...
2022-01-24 (first published: 2022-01-10)
898 reads
Identifying Recompile Causes
Strictly speaking, a recompile isn’t really a performance tuning problem. In fact, a lot of time, recompiles are desired because they reflect changes in statistics which are likely to...
2022-01-12 (first published: 2022-01-03)
280 reads
Where the World Takes You
We're launching into a new year and there are lots of "looking into the future" articles out there. Personally, I'm pretty jazzed for the coming year for any number of reasons (can you say "SQL Server 2022"?). However, I also get a little retrospective at times like this. Now, I'm not going to talk about […]
2022-01-08
175 reads
Tell Your Loved Ones You Care
The Data Platform community lost a couple of people this week. Euan Garden and Dean Vargas. These were good people. They're going to be sorely missed. While I wanted to say something profound about them, I don't think I can do them justice. They were both simply good. The kind of people you want to […]
2021-12-18
215 reads
Get SQL Server 2022 Now: It’s Called Azure
If you’re like me, your palms went into a cold sweat to get your grubby fingers on the bits for SQL Server 2022 a few nanoseconds after you heard...
2021-11-29
64 reads
It's All About the Gratitude
I'm writing this the day after the US holiday of Thanksgiving. Lots of things are said about Thanksgiving, positive, negative, in between. The core concept of the holiday is to take a moment to take stock of what you have. It's a good idea. Every so often, look around and acknowledge, depending on anyone's situation, […]
2021-11-27
107 reads
SQL Server 2022 and Learning
Microsoft announced the release of the next version of SQL Server, 2022. There's a bunch of new enhancements that we can all get excited about. I can't wait to test the "Parameter Sensitive Plan" optimization myself. We can look forward to seeing this stuff in action, and in detail, at the PASS Data Community Summit […]
2021-11-06
426 reads
Blogs
AI: Blog a Day – Day 8: RAG – Retrieval Augmented Generation
By Vinay Thakur
RAG — Retrieval Augmented Generation. we have covered so far — embeddings, vectors, vector...
AI: Blog a Day – Day 7: Vector and Vector Databases
By Vinay Thakur
Continuing from Day 6 we learned Embeddings, Semantic Search and Checks, on Day 7...
AI: Blog a Day – Day 6: Embeddings – How AI Understands
By Vinay Thakur
Continuing from Day 5 where we covered notebooks, HuggingFace and fine tuning AI now...
Forums
Not Just an Upgrade
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Restoring On Top I
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Designing Delta Tables with Liquid Clustering: Real-World Patterns for Data Engineers
Comments posted to this topic are about the item Designing Delta Tables with Liquid...
Question of the Day
Restoring On Top I
I am doing development work on a database and want to keep a backup so I can reset my database. I make some changes and want to restore over top of my changes. When I run this code, what happens?
USE Master BACKUP DATABASE DNRTest TO DISK = 'dnrtest.bak' GO USE DNRTest GO CREATE TABLE MyTest(myid INT) GO USE master RESTORE DATABASE DNRTest FROM DISK = 'dnrtest.bak' WITH REPLACESee possible answers