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Technical Article

SQL Server Internals: Reading Pages

  • Article

The I/O from an instance of the SQL Server Database Engine includes logical and physical reads. A logical read occurs every time the Database Engine requests a page from the buffer cache. If the page is not currently in the buffer cache, a physical read first copies the page from disk into the cache.

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2022-10-17

SQLServerCentral Editorial

Learning New Technology Is Challenging

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On nights and weekends, I've been playing with Arduino controllers. I have a couple of projects I'm working through (building a robot that can roll around with "eyes" to avoid obstacles). I've also been trying to work with STM32 controllers, because in a lot of ways, they're more powerful than an Arduino. However, I've hit […]

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2022-10-08

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SQLServerCentral Editorial

Who Are You?

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I was sitting here thinking about the editorial when Kathi Kellenberger came to mind. She would frequently write about her favorite show, Star Trek. I too have been a fan of Star Trek since I was very young. However, my favorite show is a little more obscure and not as many people have seen it, […]

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2022-09-17

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SQLServerCentral Editorial

Things Move Fast

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I have several things I’d like to say in the editorial today, but I feel I have to start off with my condolences to the family of Queen Elizabeth II. For that matter, my condolences to the people of Britain. This truly is the end of an era. Things do indeed move fast sometimes. Working […]

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2022-09-10

162 reads

SQLServerCentral Editorial

Developer Optimism

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Developers, in general, are very optimistic about the code they write. This is likely one cause of their estimates of the time required being low, as well as the various bugs that slip through because of corner cases that appear for the problem being solved. Often developers think they've considered the various ways this code […]

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2022-09-07

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Question of the Day

Missing the Jaro Winkler Distance

I upgraded a SQL Server 2019 instance to SQL Server 2025. I wanted to test the fuzzy string search functions. I run this code:

SELECT JARO_WINKLER_DISTANCE('tim', 'tom')
I get this error message:
Msg 195, Level 15, State 10, Line 1 'JARO_WINKLER_DISTANCE' is not a recognized built-in function name.
What is wrong?

See possible answers