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DB_S_ASYNCHRONOUS
OLE DB operation continues asynchronously
DB_S_ASYNCHRONOUS is HRESULT 265936 (0x00040ED0) from Microsoft OLE DB. AllStat describes this result as “Operation is being processed asynchronously.” The high-order severity bit is clear, so this is a success result, but it carries more information than plain S_OK.
The method accepted the request and processing is still underway; completion must be observed through the provider’s asynchronous status or notification mechanism.
State boundary that must be proved
The central question for it is whether the caller retains required objects and waits for a terminal state before consuming incomplete outputs. The HRESULT alone confirms neither unrelated work nor the quality of optional outputs.
A reliable interpretation of this result names the exact method contract, the object generation, and the outputs that remain valid. This prevents a success-with-information result from being promoted to full success or demoted to a generic error.
Where the result is encountered
- This result can appear in asynchronous initialization; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- It can appear in background rowset population; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- It can appear in commands or schema operations supporting IDBAsynchStatus; record the producing interface and method rather than inferring behavior from the symbolic name alone.
The same numeric success value can be mishandled when a wrapper exposes only a Boolean. Keep the original HRESULT until the code-specific outputs and state transition have been evaluated.
Evidence and telemetry to preserve
- preserve operation identifier and phase.
- preserve IDBAsynchStatus progress.
- preserve completion callback or event.
- preserve object lifetimes.
- preserve cancellation request and final HRESULT.
Also record db_s_asynchronous_operation, db_s_asynchronous_object, db_s_asynchronous_state_before, db_s_asynchronous_state_after, UTC time, process and thread identifiers, and a correlation ID. Keep secrets out of logs while retaining GUIDs, CLSIDs, media subtypes, property IDs, row identities, and hashes needed to distinguish objects.
Diagnostic sequence
- capture the raw HRESULT
0x00040ED0immediately after the returning method and record whether the caller usedSUCCEEDED,FAILED, equality testing, or exception translation. - Identify the exact owner of it: interface, method, object instance, provider or filter version, thread or apartment, and operation phase.
- Validate the decisive contract boundary for it: the caller retains required objects and waits for a terminal state before consuming incomplete outputs.
- inspect every output parameter, count, status array, returned interface, or side effect that the method documentation associates with this success-with-information result.
- Compare the observed state before and after it; do not assume that a success severity bit means every optional sub-operation completed.
- reproduce the smallest request with the same object state and then change only the condition identified by the evidence before repeating the operation.
Correct handling, retry, and recovery
Return control to the application, poll or subscribe with a bounded policy, and handle cancellation through the documented interface. Do not call synchronous consumers on incomplete results.
Retry it only when the recorded state can change the documented outcome. Repeating the same call is inappropriate for a stable end marker, cancellation, unsupported format, adjusted property, or partial result whose completed side effects have not been reconciled.
Practical validation scenario
A data source initializes asynchronously. The application keeps the data source object alive, displays progress from IDBAsynchStatus, and creates a session only after terminal success.
The negative test should preserve the condition that produces it; the recovery test should alter only that condition and verify the final state as well as the HRESULT.
Difference from nearby HRESULT values
E_PENDING is a generic not-yet-available condition; it explicitly reports OLE DB background processing accepted by the provider.
This distinction determines whether the caller should consume partial outputs, stop iteration, wait, reconfigure, notify the user, or perform no error recovery at all.
Developer and administrator guidance
Tests for it should verify both the encoded condition and the resulting outputs. A test for it that checks only SUCCEEDED cannot detect stale counts, partial streams, adjusted properties, missing callbacks, or other code-specific effects.
A support report for it should include decimal 265936, hexadecimal 0x00040ED0, the AllStat meaning, the owning API, and the first detailed status or output that explains why the method did not return ordinary S_OK.
References
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