docs: document COPY FROM atomicity - #37909
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patrickwwbutler
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Jul 28, 2026
kay-kim
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Jul 28, 2026
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Requested by Pranshu Maheshwari · Slack thread
Motivation
A question came up about whether
COPY FROMis atomic when reading multiple files from an S3 location: if it fails partway, could some files be ingested and others not? The confirmed behavior is that the whole operation is atomic (all batches are staged before commit, and any failure commits nothing), but this guarantee was not documented.Description
Add an Atomicity subsection to the COPY FROM Details section, stating that the entire operation commits in a single transaction and that a partial failure commits no data.
Verification
Docs-only change to
doc/user/content/sql/copy-from.md. Adds a single###subsection under Details containing a plain paragraph with inline code and no new Hugo shortcodes. Confirmed the added heading level and placement match the surrounding Details subsections and thatgit diffshows only the intended addition.Generated by Claude Code