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DB_E_NOCONSTRAINT
Meaning
Windows documents DB_E_NOCONSTRAINT as “Constraint does not exist”. In this case, a constraint operation uses a valid-looking ID for which no constraint exists in the target scope.
Conditions that specifically lead to the result
- Cause 1: the constraint was already dropped.
- Cause 2: the ID is scoped to another table or schema.
- Cause 3: metadata was cached before a deployment renamed the constraint.
Relevant contract
OLE DB DDL interfaces identify indexes, commands and constraints with provider-scoped DBIDs. Constraint descriptors also carry type, column arrays, match behavior, deferrability and update/delete rules that must agree as one structure.
Investigation of this result should start with the session performing DDL, target table metadata and the exact DBID or DBCONSTRAINTDESC supplied.
Diagnostic sequence
- Identify the exact failing stage: a constraint operation uses a valid-looking ID for which no constraint exists in the target scope.
Evidence to collect
When recording diagnostic data involving catalog names, schema names, object identifiers and deployment definitions, use types, lengths, hashes or redacted identifiers rather than secrets or complete business data.
- Evidence 1: constraint DBID and target table.
- Evidence 2: current constraint schema rowset.
- Evidence 3: deployment history and concurrent DDL activity.
Corrective actions
- Action 1: refresh constraint metadata before mutation.
- Action 2: treat already-absent removal as idempotent only by policy.
- Action 3: scope constraint caches by catalog, schema and table.
Practical scenario
A rollback tries to drop a constraint removed by an earlier recovery step; an idempotent existence check avoids repeated failure.
Retry and recovery
Retry rule: retry only after resolving an existing constraint or creating the intended one.
Difference from nearby HRESULT values
DB_E_BADCONSTRAINTID means the identifier is malformed, while DB_E_NOCONSTRAINT means no object matches a valid identifier.
Official Microsoft references
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