Index Uniqueness Checks¶
PostgreSQL Global Development Group. Index Uniqueness Checks. PostgreSQL Documentation.
Cited by¶
1 citation across 1 artifact.
Each citation links to the sentence it supports in the citing article.
Mechanisms¶
- Unique Index Constraint
- Its strength is that it is the only guard that survives concurrency, because it is enforced by the storage engine's own locking rather than by a check the application runs and then acts on a moment later — that check-then-insert gap is a textbook time-of-check-to-time-of-use race.
This sourceExplains that concurrency-safe uniqueness enforcement must be integral to index insertion rather than implemented as a separate check before a later action.
- Its strength is that it is the only guard that survives concurrency, because it is enforced by the storage engine's own locking rather than by a check the application runs and then acts on a moment later — that check-then-insert gap is a textbook time-of-check-to-time-of-use race.
Verification¶
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Does it back the claim? Not recorded. The single citation of this work carries no recorded support check.
Support is checked per citation rather than per work — the same source can be cited soundly in one article and wrongly in another. Per-citation recording began recently, so a citation with no recorded check is a gap in the record rather than evidence it went unchecked.
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