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DB_E_PENDINGCHANGES
Exact value and result class
DB_E_PENDINGCHANGES has unsigned value 2147749462 (0x80040E56) and signed 32-bit value -2147217834. AllStat describes it as “Pending changes exist on a row with a reference count of zero”. In this result, a row whose external reference count reached zero still has deferred changes that prevent complete release.
The high bit is set, so this result is a failure HRESULT. Its facility is 4 (FACILITY_ITF) and its low code is 3670 (0x0E56). These fields identify an interface-defined result family; they do not identify the provider instance, method, object generation or partial effects.
Contract boundary
Deferred-update rowsets retain pending inserts, updates and deletes until IRowsetUpdate::Update or Undo resolves them. Rows with reference count zero can remain active solely because pending state still exists, and provider limits can count those rows.
Investigation of this result should start with the rowset generation, HROW state, pending-status array and granted update properties. Capture it before ADO, ATL,.NET or a database abstraction layer replaces the native HRESULT with a generic exception.
Evidence to collect
A useful this result 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 changed row values, keys and original-value snapshots, use types, lengths, hashes or redacted identifiers rather than secrets or complete business data.
- Evidence 1 for it: row pending status before ReleaseRows.
- Evidence 2 for it: per-row status returned during release or update.
- Evidence 3 for it: whether original and changed values remain cached.
Conditions that specifically lead to it
- Cause 1 for it: the consumer released HROW without calling Update or Undo.
- Cause 2 for it: a wrapper lost the last visible reference while pending state remained.
- Cause 3 for it: shutdown cleanup releases handles before resolving the deferred-update transaction.
Diagnostic sequence
- Capture raw
0x80040E56and symbolic it at the native call boundary. - Identify the exact failing stage for it: a row whose external reference count reached zero still has deferred changes that prevent complete release.
- Retrieve all OLE DB error records for it before another COM call replaces thread error information.
- Compare the live object state and provider-granted capabilities with the input that produced it.
- Reduce the operation to the smallest case that preserves the same update contract.
- Apply one evidence-backed correction for it and verify that the result is not merely replaced by a neighboring HRESULT.
Retry and recovery
Retry rule for it: retry the release path after pending changes have been transmitted or undone. 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.
Corrective actions
- Action 1 for it: call Update for intended changes before final release.
- Action 2 for it: call Undo for abandoned changes.
- Action 3 for it: make the edit object own both HROW lifetime and pending-state resolution.
Practical scenario
A form closes and drops its HROW while an unsaved edit remains; an explicit save-or-discard decision resolves the pending row. Keeping it with the method and object state makes this scenario diagnosable instead of reducing it to “database error”.
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.
Difference from nearby HRESULT values
DB_E_MAXPENDCHANGESEXCEEDED prevents adding more pending rows, while it reports unresolved state on a row being released. Telemetry and remediation for it should keep these outcomes distinct.
Official Microsoft references
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