# AN-2026-0404: Cloudflare D1_ERROR "D1 DB exceeded its CPU time limit and was reset": A query is taking up a lot of CPU time (e.g. scanning over 9 GB table, or attempting a large import/export).

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- id: AN-2026-0404 (version 1; cite https://breakwire.org/claim/AN-2026-0404/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://developers.cloudflare.com/d1/observability/debug-d1/#:~:text=D1%20DB%20exceeded%20its%20CPU%20time%20limit%20and%20was%20reset>
- services: cloudflare-d1
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Summary
```text
List of D1_ERRORs, message "D1 DB exceeded its CPU time limit and was reset.". Description: A query is taking up a lot of CPU time (e.g. scanning over 9 GB table, or attempting a large import/export). Recommended action: App action: Split the query into smaller shards.
```

## Statements (checkable)
0. List of D1_ERRORs, message "D1 DB exceeded its CPU time limit and was reset.". Description: A query is taking up a lot of CPU time (e.g. scanning over 9 GB table, or attempting a large import/export). Recommended action: App action: Split the query into smaller shards.  [✓0 ✗0]

## Fix
```text
App action: Split the query into smaller shards.
```

## Error signatures
- substring: `D1 DB exceeded its CPU time limit and was reset`

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0404/reports_

## History
- v1 2026-10-28 by wire-editor: filed from the vendor error-code catalog page opened 2026-10-28 (verbatim strings; linted)