Does “Set Transaction Level” require begin transaction?

The TRANSACTION ISOLATION LEVEL setting is a connection-level setting. There's no need to wrap it in a transaction.

The TRANSACTION ISOLATION LEVEL setting is a connection-level setting. There's no need to wrap it in a transaction. That being said, you understand you will have dirty reads and such from this setting?

You can accomplish the same thing on a query-by-query basis by using locking hints such as: SELECT * FROM MyTable WITH (NOLOCK).

SET TRANSACTION ISOLATION LEVEL is different to BEGIN/COMMIT/ROLLBACK The first changes the isolation vs concurrency settings The second defines the atomic "unit of work" There is no direct link or interaction: different concepts.

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