What does HRESULT 0x80040E79 (DB_E_BADDEFERRABILITY) mean?

 
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DB_E_BADCONSTRAINTFORM DB_E_BADMATCHTYPE

DB_E_BADDEFERRABILITY

Exact value and result class

DB_E_BADDEFERRABILITY has unsigned value 2147749497 (0x80040E79) and signed 32-bit value -2147217799. AllStat describes it as “Specified deferrability flag is invalid or not supported by the provider”. In this result, a constraint descriptor requests an invalid or unsupported deferrability mode.

The high bit is set, so this result is a failure HRESULT. Its facility is 4 (FACILITY_ITF) and its low code is 3705 (0x0E79). These fields identify an interface-defined result family; they do not identify the provider instance, method, object generation or partial effects.

Contract boundary

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. Capture it before ADO, ATL,.NET or a database abstraction layer replaces the native HRESULT with a generic exception.

Conditions that specifically lead to the result

  • Cause 1 for it: unknown deferrability bits are set.
  • Cause 2 for it: the provider does not support deferred constraints.
  • Cause 3 for it: the selected constraint type cannot use the requested mode.

Evidence to collect

A useful it event records provider CLSID and version, process architecture, interface IID and method, object correlation ID, transaction state and the immediately preceding HRESULT. When recording it 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 for it: deferrability value and constraint type.
  • Evidence 2 for it: provider DDL capability metadata.
  • Evidence 3 for it: transaction semantics expected by the application.

Diagnostic sequence

  1. Capture raw 0x80040E79 and symbolic it at the native call boundary.
  2. Identify the exact failing stage for it: a constraint descriptor requests an invalid or unsupported deferrability mode.
  3. Retrieve all OLE DB error records for it before another COM call replaces thread error information.
  4. Compare the live object state and provider-granted capabilities with the input that produced it.
  5. Reduce the operation to the smallest case that preserves the same ddl contract.
  6. Apply one evidence-backed correction for it and verify that the result is not merely replaced by a neighboring HRESULT.

Corrective actions

  • Action 1 for it: use a documented deferrability value.
  • Action 2 for it: omit deferred behavior when the provider cannot guarantee it.
  • Action 3 for it: redesign transaction ordering rather than silently weakening integrity.

Retry and recovery

Retry rule for it: retry after selecting a provider-supported deferrability contract. A it retry is safe only when the relevant input, object generation, capability or external state has changed. Before replaying a modifying call that returned it, determine whether rows, schema objects or URL resources were partially created or changed.

Do not turn it into an unbounded retry loop. Preserve cancellation for it and use a fresh provider object when the failed call may have left local state ambiguous.

Practical scenario

A migration marks every constraint initially deferred on a provider with immediate-only validation; capability-aware DDL avoids the result. Keeping it with the method and object state makes this scenario diagnosable instead of reducing it to “database error”.

Difference from nearby HRESULT values

DB_E_BADMATCHTYPE concerns foreign-key matching semantics, while it concerns when constraint checking occurs. Telemetry and remediation for it should keep these outcomes distinct.

Developer and operations guidance

Code handling it should release COM objects in ownership order, retain per-row, per-column or per-property statuses, and log granted capabilities rather than only requested options. While handling it, opaque values such as HACCESSOR, HROW, HCHAPTER, DBID components and provider handles must remain scoped to the object that issued them.

Operational dashboards for it should group by provider version, interface, method and normalized failure stage. A it event must not expose passwords, tokens, full connection strings, unrestricted command text or raw row contents.

Official Microsoft references

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