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

Understanding and Retrieving Transaction Isolation Levels in SQL Server

Knowing your current transaction isolation level is essential for maintaining data integrity and optimizing SQL Server performance. This information is readily accessible through a simple query.

Here's how to retrieve the current transaction isolation level:

<code class="language-sql">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;</code>

This query utilizes the sys.dm_exec_sessions dynamic management view to access the transaction_isolation_level attribute. The @@SPID function identifies the current session's ID.

The query's output is a string representing the current isolation level. Possible values include:

• Unspecified
• ReadUncommitted
• ReadCommitted
• Repeatable
• Serializable
• Snapshot

For detailed explanations of each isolation level, consult the official Microsoft documentation (learn.microsoft.com). By understanding your transaction isolation level, you can fine-tune database operations and ensure data accuracy in concurrent environments.

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