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CI_CORRUPT_DATABASE
CI_CORRUPT_DATABASE — 0xC0041800
A productive reading of corrupt Indexing Service database begins at the component boundary where the core content-index database structures cannot be trusted for normal query or update processing.
Operational meaning
Indexing Service catalogs are derived from source documents, filter output, word lists, indexes, and a property store. In the context of corrupt Indexing Service database, corruption is reported, preserve source data and catalog evidence, validate storage, and rebuild derived structures rather than modifying documents to match the damaged index. Locate the first component that changes state and distinguish later summary errors.
Important distinction. A corrupt index database is derived-data failure; source files and ACLs should be preserved rather than modified to fit the broken catalog.
Facts worth preserving
| Preserve | Why it matters |
|---|---|
| Catalog path/name, service build, first corruption event, and last clean shutdown | Provides a stable before/after comparison for rebuilding or correcting the index path. |
| Disk, filesystem, controller, and backup history | Shows whether the first inconsistency arose during filtering, storage, administration, or enumeration. |
| Catalog statistics, merge/checkpoint state, and affected scopes | Ties the result to one catalog, source document, filter, or query object. |
| Source-document inventory needed to rebuild independently of the catalog | Separates catalog state from source data, filter output, and client lifecycle. |
Reproduce the condition safely
- Create a separate empty catalog on healthy storage. Record the first filter, catalog, merge, query, or enumeration result that changes.
- Index a small representative scope and query it. Keep source bytes, scope, filter version, and unrelated catalog settings fixed.
- Compare behavior after restoring a known-good catalog backup without overwriting the corrupt copy. Use a copied catalog or a small disposable catalog when the test can rebuild derived state.
Retry only after one controlled catalog, filter, source, query, or merge condition changed; reopening the service may create a new catalog generation and hide the original evidence.
What not to infer
- Known-good comparison succeeds: isolate the production object or configuration associated with the failing operation.
- Same failure on the control: investigate the shared catalog, storage, filter-host, or query layer before changing source documents.
- Different status after one change: preserve both results; the first rejected condition was removed, but the operation is not yet proved complete.
Closing the incident
Correction: Preserve evidence, repair storage, and rebuild or restore the catalog from authoritative source content. Keep the original catalog configuration, source inventory, filter identity, query definition, and event sequence so the change can be reversed and explained.
Accept the repair only when the rebuilt catalog indexes and queries all scopes, survives a master merge and restart, and no storage errors recur. Repeat the original supported operation under the original identity and object state; a new catalog, different source scope, or replacement filter is useful comparison evidence but not final regression proof.
Technical references
- Microsoft: Indexing Service purpose and architecture — defines the formal status.
- Microsoft: Indexing Service helper-function values — documents the relevant API or lifecycle.
- Microsoft: indexing and catalog management — provides the architecture, format, or protocol context.
- Microsoft: Indexing Service configuration entries — supports the controlled verification criteria.
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