What does HRESULT 0x80040E95 (DB_E_ASYNCNOTSUPPORTED) mean?

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DB_E_ASYNCNOTSUPPORTED

Exact value and result class

DB_E_ASYNCNOTSUPPORTED has unsigned value 2147749525 (0x80040E95) and signed 32-bit value -2147217771. AllStat describes it as “Asynchronous binding is not supported by this provider”. In this result, the consumer requests asynchronous URL binding from a provider that supports only synchronous binding.

The high bit is set, so this result is a failure HRESULT. Its facility is 4 (FACILITY_ITF) and its low code is 3733 (0x0E95). These fields identify an interface-defined result family; they do not identify the provider instance, method, object generation or partial effects.

Conditions that specifically lead to the result

• Cause 1 for it: an asynchronous bind flag is set without capability negotiation.
• Cause 2 for it: the provider implements binding but not IDBAsynchStatus for that object.
• Cause 3 for it: a generic client assumes all remote URLs support async progress.

Contract boundary

The OLE DB binder model maps URLs to row, rowset, stream or collection objects. URL scope, requested object type, bind flags, asynchronous capability, locks and server reachability are independent parts of the binding contract.

Investigation of this result should start with the binder or session, normalized URL, requested GUID/object type and DBBINDURLSTATUS result. Capture it before ADO, ATL,.NET or a database abstraction layer replaces the native HRESULT with a generic exception.

Diagnostic sequence

1. Capture raw 0x80040E95 and symbolic it at the native call boundary.
2. Identify the exact failing stage for it: the consumer requests asynchronous URL binding from a provider that supports only synchronous binding.
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 binder contract.
6. Apply one evidence-backed correction for it and verify that the result is not merely replaced by a neighboring HRESULT.

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 URLs containing credentials, tenant paths and remote object names, use types, lengths, hashes or redacted identifiers rather than secrets or complete business data.

• Evidence 1 for it: bind flags and requested object type.
• Evidence 2 for it: provider asynchronous capability properties.
• Evidence 3 for it: interfaces exposed on the returned or binder object.

Corrective actions

• Action 1 for it: fall back to synchronous binding on a worker thread when safe.
• Action 2 for it: feature-detect async support.
• Action 3 for it: keep cancellation semantics explicit in the fallback.

Practical scenario

A UI requests async binding from a file-backed provider with synchronous-only support; moving the bind to a worker preserves responsiveness. Keeping it with the method and object state makes this scenario diagnosable instead of reducing it to “database error”.

Retry and recovery

Retry rule for it: retry synchronously or with a provider that advertises asynchronous binding. 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.

Difference from nearby HRESULT values

DB_E_NOTSUPPORTED is general method capability failure, while it specifically rejects asynchronous binding. 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

• Microsoft: direct binding in OLE DB
• Microsoft: OLE DB root binder object
• Microsoft: OLE DB row objects

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