Monitor Performance & Query Execution in Fabric Warehouse | Microsoft Fabric Tutorial

Monitor Performance & Query Execution in Fabric Warehouse

Monitoring performance and query execution in Microsoft Fabric Warehouse is essential for optimizing resource usage, identifying bottlenecks, and tuning SQL workloads. In this tutorial, we’ll walk through powerful system views and dynamic management queries you can use for real-time and historical insights.

🔍 Query Insights Views in Fabric

Microsoft Fabric provides specialized views to track query and session behavior:

queryinsights.exec_requests_history – Tracks historical query executions
queryinsights.exec_sessions_history – Tracks session metadata
queryinsights.frequently_run_queries – Identifies most commonly executed queries
queryinsights.long_running_queries – Lists slowest queries for optimization

SELECT * FROM queryinsights.long_running_queries;

🛠️ Using SQL DMVs for Live Monitoring

Dynamic Management Views (DMVs) offer real-time insight into query activity:

sys.dm_exec_requests – Tracks currently running queries
sys.dm_exec_sessions – Lists active sessions
sys.dm_exec_connections – Shows active client connections

SELECT
    r.session_id,
    r.status,
    r.start_time,
    r.command,
    r.cpu_time,
    r.total_elapsed_time AS elapsed_ms,
    r.reads,
    r.writes,
    t.text AS query_text,
    s.program_name,
    s.login_name,
    s.host_name
FROM sys.dm_exec_requests r
JOIN sys.dm_exec_sessions s ON r.session_id = s.session_id
CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) AS t
WHERE r.status = 'running'
ORDER BY r.total_elapsed_time DESC;

Optionally, you can use the KILL command to stop long-running or blocked sessions (admin permission required):

KILL 56;

✅ Best Practices

Use queryinsights views for historical trends and usage stats
Use DMVs for real-time analysis of live workloads
Investigate long-running queries and optimize indexes or logic
Periodically review session and resource usage patterns

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