# Sigma Computing: Major incident: Snowflake tables not loading on AWS US West 2

**Summary:** Sigma Computing reported a major degradation affecting AWS US West 2: long-running Snowflake table queries in Sigma Workbooks could time out. Updates placed onset around 14:00 UTC on September 4, 2024; the incident record started at 14:57 UTC, with a computed duration of 52 min. Temporary mitigation proved effective; resolution was recorded at 15:50 UTC. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2024-09-04 14:57 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/kc6c8b9rgn1q](https://stspg.io/kc6c8b9rgn1q)
- [Company: Sigma Computing](https://rewindex.com/company/sigma-computing.md)
- Versions: before (none: first archived) → after incident\_version:77/4n6r99p9bpvk@e981eeb938b1
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Snowflake tables not loading on AWS US West 2
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2024-09-04 14:57 UTC
```

**5. Added: Resolved time**

```diff
+ 2024-09-04 15:50 UTC
```

**6. Added: Affected components**

```diff
+ AWS - Sigma - AWS (US), Sigma - AWS (US)
```

**7. Added: Update** (investigating) · 2024-09-04 14:31 UTC

```diff
+ At approximately 7 am PST, Sigma users on AWS US West experienced long running workbook queries on Snowflake tables that may result in a timeout.  This incident is now actively under investigation. We are treating this as our highest priority. Our apologies for any inconvenience caused. Impacted Cloud Regions & Services: Sigma users hosted on AWS US West  Incident Start Time: Approximately 14:00 UTC September 4, 2024
```

**8. Added: Update** (investigating) · 2024-09-04 14:32 UTC

```diff
+ We are continuing to investigate this issue.
```

**9. Added: Update** (monitoring) · 2024-09-04 14:57 UTC

```diff
+ Our engineers have implemented temporary mitigation measures to address the issue and we are monitoring their effect closely. Impacted Cloud Regions & Services: Sigma users hosted on AWS US West 2 User Experience: We expect the rate of errors for long running queries on Snowflake tables to decrease while working in Sigma Workbooks. Incident Start Time: Approximately 14:00 UTC September 4, 2024 Incident End Time: Approximately 14:30 UTC September 4, 2024
```

**10. Added: Update** (resolved) · 2024-09-04 15:50 UTC

```diff
+ The mitigation measures have proven effective, and the issue is resolved. We will perform a root cause analysis (RCA) and publish our findings in a postmortem note to the Sigma Community site in coming days. Impacted Cloud Regions & Services: Sigma users hosted on AWS US West 2 User Experience: We expect the rate of errors to be negligible for all Sigma users hosted on AWS US West 2 Incident Start Time: Approximately 14:00 UTC September 4, 2024 Incident End Time: Approximately 14:30 UTC September 4, 2024
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2024-09-04 14:57 UTC | Major incident: Snowflake tables not loading on AWS US West 2 (this change) | degradation |

All Sigma Computing changes: [timeline](https://rewindex.com/company/sigma-computing/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/id505c8da4749f6 · Markdown: https://rewindex.com/change/id505c8da4749f6.md · JSON: https://rewindex.com/api/v1/changes/id505c8da4749f6 · Generated 2026-10-18T02:28:36.284Z