What does HRESULT 0x80040E79 (DB_E_BADDEFERRABILITY) mean?

 
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DB_E_BADCONSTRAINTFORM DB_E_BADMATCHTYPE

DB_E_BADDEFERRABILITY

Specified deferrability flag is invalid or not supported by the provider

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

Contract boundary

For DB_E_BADDEFERRABILITY, OLE DB DDL interfaces identify indexes, commands and constraints with provider-scoped DBIDs. For DB_E_BADDEFERRABILITY, constraint descriptors also carry type, column arrays, match behavior, deferrability and update/delete rules that must agree as one structure.

Investigation of DB_E_BADDEFERRABILITY should start with the session performing DDL, target table metadata and the exact DBID or DBCONSTRAINTDESC supplied. Capture DB_E_BADDEFERRABILITY before ADO, ATL, .NET or a database abstraction layer replaces the native HRESULT with a generic exception.

Conditions that specifically lead to this result

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

Evidence to collect

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

Diagnostic sequence

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

Corrective actions

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

Retry and recovery

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

Do not turn DB_E_BADDEFERRABILITY into an unbounded retry loop. Preserve cancellation for DB_E_BADDEFERRABILITY 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 DB_E_BADDEFERRABILITY 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 DB_E_BADDEFERRABILITY concerns when constraint checking occurs. Telemetry and remediation for DB_E_BADDEFERRABILITY should keep these outcomes distinct.

Developer and operations guidance

Code handling DB_E_BADDEFERRABILITY 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 DB_E_BADDEFERRABILITY, opaque values such as HACCESSOR, HROW, HCHAPTER, DBID components and provider handles must remain scoped to the object that issued them.

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

Official Microsoft references

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