Materialization cleanup delayed for Sigma users on AWS US-West-2
Incident
Report for Sigma Computing
Resolved
The mitigation measures have proven effective, and the issue has been resolved. We will perform a root cause analysis (RCA) and publish our findings in a postmortem note in the coming days. We apologize for any inconvenience this may have caused.
Impacted Cloud Regions & Services: Sigma users hosted on AWS US-West-2 using materialization
User Experience: Customers using materializations on AWS US-West-2 should no longer see the previously reported table accumulation.
Incident Start Time: Approximately August 3, 2026, at 2:44 PM UTC
Incident End Time: Approximately August 5, 2026, at 02:40 AM UTC
Impacted Cloud Regions & Services: Sigma users hosted on AWS US-West-2 using materialization
User Experience: Customers using materializations on AWS US-West-2 should no longer see the previously reported table accumulation.
Incident Start Time: Approximately August 3, 2026, at 2:44 PM UTC
Incident End Time: Approximately August 5, 2026, at 02:40 AM UTC
Monitoring
Our engineers have implemented mitigation measures for this issue and are closely monitoring their effectiveness. We expect the backlog to continue clearing over the next several hours. We will provide a further update once we can confirm full resolution.
Impacted Cloud Regions & Services: Sigma users hosted on AWS US-West-2 using materialization
User Experience: Customers using materializations on AWS US-West-2 may continue to see table accumulation reported earlier while the backlog clears; no new action is needed.
Incident Start Time: Approximately August 3, 2026, at 2:44:18 PM UTC
Impacted Cloud Regions & Services: Sigma users hosted on AWS US-West-2 using materialization
User Experience: Customers using materializations on AWS US-West-2 may continue to see table accumulation reported earlier while the backlog clears; no new action is needed.
Incident Start Time: Approximately August 3, 2026, at 2:44:18 PM UTC
Investigating
We are investigating an issue affecting materialization tables, which are not being cleaned up as expected in some customers' connected warehouses, causing them to accumulate over time. We are treating this as our highest priority and are actively working to identify and resolve the root cause. We apologize for any inconvenience this may cause.
Impacted Cloud Regions & Services: Sigma users hosted on AWS US-West-2 using materialization
User Experience: Customers using materializations on AWS US-West-2 may see stale materialization tables accumulating in their connected warehouse, which over time could approach warehouse storage/object limits.
Incident Start Time: Approximately August 3, 2026, at 2:44:18 PM UTC
Impacted Cloud Regions & Services: Sigma users hosted on AWS US-West-2 using materialization
User Experience: Customers using materializations on AWS US-West-2 may see stale materialization tables accumulating in their connected warehouse, which over time could approach warehouse storage/object limits.
Incident Start Time: Approximately August 3, 2026, at 2:44:18 PM UTC
This incident affected: AWS (Sigma - AWS (US)).