# Dagster: Critical incident: Database maintenance failover

**Summary:** Dagster reported a critical incident starting 2023-09-18 12:46 UTC, with a computed duration of 0 min. The vendor described a 90-second disruption during cloud-provider database maintenance as a primary database failed over to a secondary; Dagster operations during that window would have failed. The incident was resolved, with all systems back to normal. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2023-09-18 12:46 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/17rcdjp7j7tj](https://stspg.io/17rcdjp7j7tj)
- [Company: Dagster](https://rewindex.com/company/dagster.md)
- Versions: before (none: first archived) → after incident\_version:141/kp6jt64zw4jq@84492349bdc0
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Database maintenance failover
```

**2. Added: Impact**

```diff
+ critical
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2023-09-18 12:46 UTC
```

**5. Added: Resolved time**

```diff
+ 2023-09-18 12:46 UTC
```

**6. Added: Update** (resolved) · 2023-09-18 12:46 UTC

```diff
+ Database maintenance by our cloud provider caused a 90 second service disruption between 12:46:10 UTC and 12:47:40 UTC while a primary database failed over to a secondary. Dagster operations during this window would have failed. All systems have resumed normal operation.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2023-09-18 12:46 UTC | Critical incident: Database maintenance failover (this change) | outage |

All Dagster changes: [timeline](https://rewindex.com/company/dagster/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._


---
Canonical: https://rewindex.com/change/i29e84524ba1e75 · Markdown: https://rewindex.com/change/i29e84524ba1e75.md · JSON: https://rewindex.com/api/v1/changes/i29e84524ba1e75 · Generated 2026-10-18T02:55:40.699Z