High severityquery
Power BI Refresh Error:
Query timeout expired
What does this error mean?
The data source query ran longer than the allowed timeout period and was cancelled. Power BI enforces query timeouts to prevent a single dataset from consuming resources indefinitely.
Common causes
- 1The source table grew significantly larger and the query no longer completes within the timeout
- 2Missing or stale database indexes causing a full table scan on large tables
- 3A blocking query on the source database holding locks and preventing the Power BI query from completing
- 4The dataset query is not incremental and re-reads the entire history on every refresh
- 5Premium capacity or gateway resource contention slowing down query execution
How to fix it
- 1Run the refresh query directly on the database (SSMS, psql, etc.) with query timing to see how long it actually takes
- 2Check for missing indexes on the columns used in WHERE, JOIN, and ORDER BY clauses
- 3Implement incremental refresh in Power BI Desktop to only query new or modified rows
- 4Query aggregate tables or materialized views on the source instead of raw fact tables
- 5If using DirectQuery, consider switching to Import mode with scheduled refresh for large datasets
- 6For Premium, check capacity utilization — a saturated capacity slows all queries running on it