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Why does enabling Snapshot Isolation use up CPU?

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I'm currently enabling Snapshot Isolation with ALTER DATABASE [MyDB] SET ALLOW_SNAPSHOT_ISOLATION ON;. It was taking longer that I expected, so I ran sp_WhoIsActive. I was surprised to discover that it has used 81,519 units of CPU in 83 seconds. Why does this happen?
Asked by J. Mini (1249 rep)
Aug 8, 2025, 09:14 PM