# Sigma Computing: Workbooks not loading for Sigma users on AWS Snowflake

- Impact (vendor’s label): major
- Status: postmortem
- Started: 2023-09-14 14:41 UTC · Resolved: 2023-09-14 17:24 UTC · Duration: 2.7 h
- Updates: 5 · Affected components: AWS - Sigma - AWS (US), Sigma - AWS (US), GCP - Sigma - GCP (US), Azure - Sigma - Azure (US), AWS - Sigma - AWS (Europe), Sigma - AWS (Europe), AWS - Sigma - AWS (Canada)
- [Vendor status page: https://stspg.io/t0wp1hgjnpmj](https://stspg.io/t0wp1hgjnpmj)
- [Company: Sigma Computing](https://rewindex.com/company/sigma-computing.md)

## Summary

Sigma Computing reported a major outage causing workbooks not to load and queries to hang for AWS US and AWS EU users using Snowflake CDW. The final update corrected the start to approximately 2023-09-14 12:49 UTC; mitigation resolved it at 2023-09-14 17:24 UTC (computed duration: 2 h 43 min). _(machine-written, sol)_
## Timeline of updates

- **investigating** 2023-09-14 14:41 UTC: We are investigating an issue with workbooks not loading and queries hanging. We are treating this as our highest priority. Our apologies for any inconvenience caused. Impacted Cloud Regions & Services: Sigma users hosted on AWS US & AWS EU using Snowflake CDW Incident Start Time: Approximately 14:12 UTC September 14, 2023
- **investigating** 2023-09-14 15:15 UTC: We are continuing to investigate this issue.
- **monitoring** 2023-09-14 15:27 UTC: Our engineers have implemented mitigation measures and we are monitoring the effect closely. Impacted Cloud Regions & Services: Sigma users hosted on AWS US & AWS EU using Snowflake CDW User Experience: We expected workbooks to load normally starting 14:48 UTC for AWS US users and at 15:01 UTC for AWS EU users.  Incident Start Time: Approximately 14:12 UTC Sep 14, 2023 Note: A correction was made for the incident start time to be in 24-Hour time
- **resolved** 2023-09-14 17:24 UTC: 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. You will receive a notification when that occurs. Impacted Cloud Regions & Services: Sigma users hosted on AWS US & AWS EU using Snowflake CDW Incident Start Time: Approximately 12:49 UTC September 14, 2023 Incident End Time: Approximately 14:39 UTC September 14, 2023
- **postmortem** 2023-09-29 18:31 UTC: Sigma Engineering has completed the postmortem of this incident. A Root Cause Analysis \\(RCA\\) is available on the Sigma Community site: \[Postmortem for September 14th, 2023; Workbooks not loading for Sigma users on AWS Snowflake\](https://community.sigmacomputing.com/t/post-mortem-for-september-14th-2023-workbooks-not-loading-for-sigma-users-on-aws-snowflake/2604)

## Rewindex changes for this incident

- 2023-09-14 14:41 UTC: [Major incident: Workbooks not loading for Sigma users on AWS Snowflake](https://rewindex.com/change/i0b8caf6785a7e7.md)


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Canonical: https://rewindex.com/company/sigma-computing/incidents/czgbhs4hyh1j · Markdown: https://rewindex.com/company/sigma-computing/incidents/czgbhs4hyh1j.md · JSON: https://rewindex.com/api/v1/companies/sigma-computing/incidents/czgbhs4hyh1j · Generated 2026-10-18T10:32:00.457Z