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DB_E_INDEXINUSE
Exact value and interpretation
DB_E_INDEXINUSE has the unsigned 32-bit value 2147749430 (0x80040E36) and the signed representation -2147217866. AllStat defines the result as “Index is in use”. In the concrete failure represented here, a schema operation cannot alter or drop an index because the index is currently in use.
The high bit is set for it, so it is a failure HRESULT rather than a success or informational status. Its facility field is 4 (FACILITY_ITF) and its low code is 3638 (0x0E36). Those bit fields place this result in an interface-defined family, but they do not reveal the provider, object identity, method, rowset generation or command state that produced it.
Evidence to collect before changing the system
A useful this result record includes provider CLSID and version, process architecture, interface and method, COM apartment and thread, object correlation ID, transaction state, and the first preceding HRESULT. When it involves catalog names, schema names, object identifiers and deployment metadata, record types, lengths, hashes or redacted identifiers instead of secrets or full business data.
- Evidence 1 for it: the index DBID and blocking session or object.
- Evidence 2 for it: open index rowsets and row handles.
- Evidence 3 for it: transaction and command activity using the index.
OLE DB contract boundary
This result must be interpreted against this contract: OLE DB data-definition interfaces operate on provider-scoped table and index DBIDs; existence, identifier validity and active use are separate outcomes, and schema changes must account for open rowsets and transactions.
Start with the session performing the definition operation and the table or index identity resolved by that session when investigating this result. Preserve it before ADO, ATL,.NET, a database abstraction layer or an application exception replaces it with a generic message; the exact interface and method matter because one OLE DB object can expose several contracts with different preconditions.
Specific conditions that produce it
- Cause 1 for it: an open index rowset still references it.
- Cause 2 for it: another command or transaction is using the index.
- Cause 3 for it: the consumer leaked an interface tied to the index.
Diagnostic sequence
- Capture it immediately at the native OLE DB return and obtain the current OLE DB error object before another COM call replaces thread error information.
- Identify the exact stage for it: a schema operation cannot alter or drop an index because the index is currently in use.
- compare the live command, rowset, accessor or schema state with the metadata and properties actually granted by the provider.
- inspect per-binding, per-property, per-row or per-record statuses whenever the method supplies them; the aggregate result may not identify the rejected element.
- reproduce the issue with the smallest command, rowset or definition operation that preserves the same contract boundary.
- apply one evidence-backed correction, then verify that the operation succeeds and does not merely change into a nearby HRESULT.
Corrective actions
- Action 1 for it: close local index rowsets and release dependent handles.
- Action 2 for it: coordinate schema changes with active workloads.
- Action 3 for it: use bounded waiting or maintenance windows rather than repeated destructive attempts.
Practical incident
A migration tries to drop an index while the same process still holds an IRowsetIndex object; releasing it first prevents it. The diagnostic value comes from retaining it together with the failing interface and object state, not from reducing every provider result to “database error”.
Implementation guidance
Code handling it should release OLE DB resources in ownership order, preserve every provider error record, and log granted properties rather than only requested properties. When handling it, handles such as HACCESSOR, HROW, HCHAPTER and provider-specific region tokens must never be treated as portable integers across object lifetimes.
When it crosses an abstraction boundary, attach a stable correlation ID and structured fields for the native HRESULT, provider source, interface IID, method, object generation and operation phase. Do not log passwords, access tokens, complete SQL text or unrestricted row values merely to make the event easier to search.
Retry and recovery policy
Retry rule for it: retry after the blocking use has ended and dependent objects are released. A safe it retry must use a changed input, object generation, provider capability or state transition. If the call returning it could have created, updated, deleted or copied data, determine partial completion before replaying it.
Use bounded retries and preserve cancellation. Configuration and contract failures should normally fail fast; concurrency, resource or transient state failures may justify retry only after their stated precondition changes.
Difference from related HRESULT values
DB_E_TABLEINUSE concerns a table, while it specifically names an index whose active use blocks the operation. Keep these outcomes separate in telemetry and user-facing remediation because it requires a different next action.
Official Microsoft references
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