Sigma Computing incident

Materialization cleanup delayed for Sigma users on AWS US-West-2

Notice Resolved View vendor source →

Sigma Computing experienced a notice incident on August 4, 2026 affecting Sigma - AWS (US), lasting 3h 20m. The incident has been resolved; the full update timeline is below.

Started
Aug 04, 2026, 11:58 PM UTC
Resolved
Aug 05, 2026, 03:19 AM UTC
Duration
3h 20m
Detected by Pingoru
Aug 04, 2026, 11:58 PM UTC

Affected components

Sigma - AWS (US)

Update timeline

  1. investigating Aug 04, 2026, 11:58 PM UTC

    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

  2. monitoring Aug 05, 2026, 12:20 AM UTC

    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

  3. resolved Aug 05, 2026, 03:19 AM UTC

    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