What does HRESULT 0x80040E51 (DB_E_PARAMUNAVAILABLE) mean?

DB_E_PARAMUNAVAILABLE

Provider cannot derive parameter information and SetParameterInfo has not been called

Exact value and result class

DB_E_PARAMUNAVAILABLE has unsigned value 2147749457 (0x80040E51) and signed 32-bit value -2147217839. AllStat describes it as “Provider cannot derive parameter information and SetParameterInfo has not been called”. In this result, parameter metadata is requested or used when the provider cannot derive it and the consumer has not supplied it.

The high bit is set, so DB_E_PARAMUNAVAILABLE is a failure HRESULT. Its facility is 4 (FACILITY_ITF) and its low code is 3665 (0x0E51). For DB_E_PARAMUNAVAILABLE, 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_PARAMUNAVAILABLE, accessors are created on a specific command or rowset and encode direction, purpose, bound parts and buffer ownership. For DB_E_PARAMUNAVAILABLE, a valid HACCESSOR on one object is not interchangeable with a parameter accessor, a readable row accessor or an accessor created for another generation.

Investigation of DB_E_PARAMUNAVAILABLE should start with the object that created the accessor, its DBACCESSORFLAGS and every DBBINDING entry. Capture DB_E_PARAMUNAVAILABLE before ADO, ATL, .NET or a database abstraction layer replaces the native HRESULT with a generic exception.

Evidence to collect

A useful DB_E_PARAMUNAVAILABLE 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_PARAMUNAVAILABLE data involving parameter values, row values and provider-owned storage pointers, use types, lengths, hashes or redacted identifiers rather than secrets or complete business data.

• Evidence 1 for DB_E_PARAMUNAVAILABLE: the command text or stable hash and dialect.
• Evidence 2 for DB_E_PARAMUNAVAILABLE: the parameter ordinals, names and expected provider types.
• Evidence 3 for DB_E_PARAMUNAVAILABLE: the HRESULT and error records from metadata derivation.

Conditions that specifically lead to this result

• Cause 1 for DB_E_PARAMUNAVAILABLE: the command dialect does not expose derivable parameter types.
• Cause 2 for DB_E_PARAMUNAVAILABLE: the statement uses constructs whose parameter metadata is ambiguous.
• Cause 3 for DB_E_PARAMUNAVAILABLE: SetParameterInfo was skipped after GetParameterInfo could not derive metadata.

Diagnostic sequence

1. Capture raw 0x80040E51 and symbolic DB_E_PARAMUNAVAILABLE at the native call boundary.
2. Identify the exact failing stage for DB_E_PARAMUNAVAILABLE: parameter metadata is requested or used when the provider cannot derive it and the consumer has not supplied it.
3. Retrieve all OLE DB error records for DB_E_PARAMUNAVAILABLE 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_PARAMUNAVAILABLE.
5. Reduce the DB_E_PARAMUNAVAILABLE operation to the smallest case that preserves the same accessor contract.
6. Apply one evidence-backed correction for DB_E_PARAMUNAVAILABLE and verify that the result is not merely replaced by a neighboring HRESULT.

Retry and recovery

Retry rule for DB_E_PARAMUNAVAILABLE: retry after explicit parameter information has been installed on the current command. A DB_E_PARAMUNAVAILABLE 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_PARAMUNAVAILABLE, determine whether rows, schema objects or URL resources were partially created or changed.

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

Corrective actions

• Action 1 for DB_E_PARAMUNAVAILABLE: call SetParameterInfo with complete parameter descriptions.
• Action 2 for DB_E_PARAMUNAVAILABLE: bind ordinals and types consistently with the supplied metadata.
• Action 3 for DB_E_PARAMUNAVAILABLE: cache parameter metadata only with the exact command definition.

Practical scenario

A provider cannot infer types for a stored-procedure call; supplying ordinals and native type names allows execution to proceed. Keeping DB_E_PARAMUNAVAILABLE with the method and object state makes this scenario diagnosable instead of reducing it to “database error”.

Developer and operations guidance

Code handling DB_E_PARAMUNAVAILABLE 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_PARAMUNAVAILABLE, 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_PARAMUNAVAILABLE should group by provider version, interface, method and normalized failure stage. A DB_E_PARAMUNAVAILABLE event must not expose passwords, tokens, full connection strings, unrestricted command text or raw row contents.

Difference from nearby HRESULT values

DB_E_BADPARAMETERNAME rejects an unrecognized name, while DB_E_PARAMUNAVAILABLE means required metadata was neither derived nor supplied. Telemetry and remediation for DB_E_PARAMUNAVAILABLE should keep these outcomes distinct.

Official Microsoft references

• Microsoft: IAccessor — official documentation relevant to DB_E_PARAMUNAVAILABLE.
• Microsoft: ICommandWithParameters — official documentation relevant to DB_E_PARAMUNAVAILABLE.
• Microsoft: OLE DB interfaces — official documentation relevant to DB_E_PARAMUNAVAILABLE.

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