What does HRESULT 0x80040E56 (DB_E_PENDINGCHANGES) mean?

DB_E_PENDINGCHANGES

Pending changes exist on a row with a reference count of zero

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 DB_E_PENDINGCHANGES is a failure HRESULT. Its facility is 4 (FACILITY_ITF) and its low code is 3670 (0x0E56). For DB_E_PENDINGCHANGES, 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_PENDINGCHANGES, deferred-update rowsets retain pending inserts, updates and deletes until IRowsetUpdate::Update or Undo resolves them. For DB_E_PENDINGCHANGES, rows with reference count zero can remain active solely because pending state still exists, and provider limits can count those rows.

Investigation of DB_E_PENDINGCHANGES should start with the rowset generation, HROW state, pending-status array and granted update properties. Capture DB_E_PENDINGCHANGES before ADO, ATL, .NET or a database abstraction layer replaces the native HRESULT with a generic exception.

Evidence to collect

A useful DB_E_PENDINGCHANGES 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_PENDINGCHANGES 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 DB_E_PENDINGCHANGES: row pending status before ReleaseRows.
• Evidence 2 for DB_E_PENDINGCHANGES: per-row status returned during release or update.
• Evidence 3 for DB_E_PENDINGCHANGES: whether original and changed values remain cached.

Conditions that specifically lead to this result

• Cause 1 for DB_E_PENDINGCHANGES: the consumer released HROW without calling Update or Undo.
• Cause 2 for DB_E_PENDINGCHANGES: a wrapper lost the last visible reference while pending state remained.
• Cause 3 for DB_E_PENDINGCHANGES: shutdown cleanup releases handles before resolving the deferred-update transaction.

Diagnostic sequence

1. Capture raw 0x80040E56 and symbolic DB_E_PENDINGCHANGES at the native call boundary.
2. Identify the exact failing stage for DB_E_PENDINGCHANGES: a row whose external reference count reached zero still has deferred changes that prevent complete release.
3. Retrieve all OLE DB error records for DB_E_PENDINGCHANGES 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_PENDINGCHANGES.
5. Reduce the DB_E_PENDINGCHANGES operation to the smallest case that preserves the same update contract.
6. Apply one evidence-backed correction for DB_E_PENDINGCHANGES and verify that the result is not merely replaced by a neighboring HRESULT.

Retry and recovery

Retry rule for DB_E_PENDINGCHANGES: retry the release path after pending changes have been transmitted or undone. A DB_E_PENDINGCHANGES 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_PENDINGCHANGES, determine whether rows, schema objects or URL resources were partially created or changed.

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

Corrective actions

• Action 1 for DB_E_PENDINGCHANGES: call Update for intended changes before final release.
• Action 2 for DB_E_PENDINGCHANGES: call Undo for abandoned changes.
• Action 3 for DB_E_PENDINGCHANGES: 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 DB_E_PENDINGCHANGES 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_PENDINGCHANGES 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_PENDINGCHANGES, 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_PENDINGCHANGES should group by provider version, interface, method and normalized failure stage. A DB_E_PENDINGCHANGES 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 DB_E_PENDINGCHANGES reports unresolved state on a row being released. Telemetry and remediation for DB_E_PENDINGCHANGES should keep these outcomes distinct.

Official Microsoft references

• Microsoft: IRowsetUpdate — official documentation relevant to DB_E_PENDINGCHANGES.
• Microsoft: deferred-update row states — official documentation relevant to DB_E_PENDINGCHANGES.
• Microsoft: IRowsetChange::InsertRow — official documentation relevant to DB_E_PENDINGCHANGES.

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