How Do I Determine the Current Transaction Isolation Level in SQL Server?

Understanding and Checking SQL Server Transaction Isolation Levels

Managing database transactions effectively requires a clear understanding of the current transaction isolation level. This level dictates the visibility and modification permissions during a transaction. SQL Server offers several predefined levels.

To identify your current transaction's isolation level, use this SQL query:

SELECT CASE transaction_isolation_level
    WHEN 0 THEN 'Unspecified'
    WHEN 1 THEN 'ReadUncommitted'
    WHEN 2 THEN 'ReadCommitted'
    WHEN 3 THEN 'Repeatable'
    WHEN 4 THEN 'Serializable'
    WHEN 5 THEN 'Snapshot'
END AS TRANSACTION_ISOLATION_LEVEL
FROM sys.dm_exec_sessions
WHERE session_id = @@SPID;

Returned Values:

The transaction_isolation_level column returns one of these values:

• 0: Unspecified
• 1: ReadUncommitted
• 2: ReadCommitted
• 3: Repeatable
• 4: Serializable
• 5: Snapshot

For detailed explanations of each isolation level, consult the official Microsoft SQL Server documentation.

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