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Transaction Isolation and the New Snapshot Isolation Level

Concurrency and transaction isolation are a prickly subject, difficult to explain with any kind of clarity without boring the reader and leaving their poor brain in a complete muddle. Therefore, it is often ignored in the vain hope it won't affect us and we can forget all about it. Well you can't ignore it any more and with SQL Server 2005 there's a whole new isolation level added to the four that already exist.

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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