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| UTC_E_FILTER_ILLEGAL_EVAL | hrBFPageNotFound |
hrBFNotSynchronous
Why this result matters
For hrBFNotSynchronous, this code narrows the investigation to one engine boundary and should not be flattened into a generic exception. The decisive boundary is a buffer-manager observation became stale because the page was evicted before the synchronous check could complete.
The stored Value is 0x880000C8 (positive JET status 200; 200). The HRESULT carries a warning, so the call may have useful output or a valid cursor state that must be inspected. The legacy this result name comes from the Windows Directory Service backup/restore message header.
The first useful distinction is that this warning concerns residency and timing; it is not evidence that the database page is absent from disk or corrupt. Start by capture the page identity, latch or ownership state, and the operation that expected the page to remain resident. That separates a reproducible incident from a later generic cleanup or service error.
Do not confuse it with
This result specifically means that this warning concerns residency and timing; it is not evidence that the database page is absent from disk or corrupt. Related values below can appear in the same workflow but require a different response:
hrBFPageNotFound | the requested page was not present in the buffer-manager context used by the operation |
|---|---|
hrNoBackup | a backup-only API was called when no external backup session is active |
hrTooManyIO | the engine reached its outstanding-I/O throttle and refused to queue more storage work |
Keep the original constant and hexadecimal value in telemetry. Replacing this result with “backup failed” or “database warning” removes the state information needed to select the next legal API call.
Forensic checklist
Preserve the first result before retries, cleanup, service restart, or file replacement changes the evidence. The diagnostic record should identify the exact API phase and the owner of every handle or artifact involved.
- Code-specific observation: capture the page identity, latch or ownership state, and the operation that expected the page to remain resident.
- Thread and cursor that made the observation: record it together with it and the timestamp of the first occurrence.
- Underlying disk-read result if one occurred: record it together with it and the timestamp of the first occurrence.
- Database and page identity: record it together with it and the timestamp of the first occurrence.
- Cache residency and ownership state: record it together with it and the timestamp of the first occurrence.
Use hashes, lengths, IDs, generation numbers, and redacted samples instead of copying directory contents or sensitive database values into routine logs. For this it investigation, a complete provenance chain is often more useful than a second automatic retry.
Objects and state involved
| Diagnostic layer | ESE buffer-cache residency, page ownership, and latch lifetime |
|---|---|
| Relevant API surface | internal page acquisition and buffer-manager paths beneath normal Jet table operations |
| Code-specific boundary | a buffer-manager observation became stale because the page was evicted before the synchronous check could complete |
| Narrow corrective direction | reacquire the page through the supported engine path and make the caller tolerate eviction between observations |
Buffer-cache observations can become stale without implying on-disk corruption., a supported caller should use Jet handles and cursor operations rather than retain internal page assumptions.
Actions that can make diagnosis worse
- do not delete database or log files based on a buffer warning.
- do not spin while holding stale page or latch state.
- do not discard the first lower-level Win32, RPC, or JET result merely because a later cleanup call returned a more familiar error.
Validation after correction
- Record it,
0x880000C8, the API name, the current phase, and all live context or file owners. - Verify the decisive condition by capture the page identity, latch or ownership state, and the operation that expected the page to remain resident.
- Apply only the narrow correction: reacquire the page through the supported engine path and make the caller tolerate eviction between observations.
- After it, recreate any context invalidated by the failure; do not carry stale HBC, cursor, file, or restore-map state into the retry.
- repeat the smallest non-destructive test that reaches the same boundary, then verify both the return value and the resulting file, cursor, backup, or database state.
Acceptance criteria for a fix
A useful regression test for this HRESULT should force the condition “a buffer-manager observation became stale because the page was evicted before the synchronous check could complete”, call one documented API transition, and assert the exact HRESULT. The corrected the case should change only the decisive precondition and should verify cleanup as well as the primary output. For the result backup or restore path, also prove that the resulting set can be enumerated and that no file handle or context remains active after finalization.
Technical references
- ESE error-code table — API ordering, file semantics, warning/error interpretation, or recovery behavior relevant to it.
- ESE architecture and transactions
- Open-source ESE implementation
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