How Do I Find My SQL Server Database's Current Transaction Isolation Level?

Determining the Current Transaction Isolation Level in SQL Server

This guide shows you how to quickly identify the current transaction isolation level for your SQL Server database.

1. Establish a Database Connection: First, connect to the specific SQL Server database you need to examine.

2. Execute the Query: Run the following SQL query:

<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>

3. Interpret the Results: The query's output will display the current transaction isolation level in the TRANSACTION_ISOLATION_LEVEL column. This reflects the isolation level of your current session.

For a comprehensive understanding of the numerical values representing each transaction isolation level, refer to the official Microsoft documentation on learn.microsoft.com.

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