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DB_S_PARAMUNAVAILABLE
OLE DB parameter information is unavailable
DB_S_PARAMUNAVAILABLE is HRESULT 265947 (0x00040EDB) from Microsoft OLE DB. AllStat describes it as “Parameter is invalid.” The severity bit indicates a nonfailure result, but the value carries a specific condition that must not be collapsed into plain S_OK.
In the OLE DB provider and consumer contract, this result means that parameter is invalid. A generic success branch is insufficient for it because continuation and output validity remain code-specific.
What must be true before accepting it
Verify that the caller can continue without the requested parameter information and does not mistake an unavailable parameter for a valid populated value. This boundary is where this result changes from useful state information into a potentially mishandled result.
A retry decision for it requires evidence about already-completed work and outstanding work.
Where the status is encountered
- This result can be returned during OLE DB command or rowset processing; log the exact method and object state instead of interpreting the constant outside that contract.
- This result can be returned during provider metadata, binding, or update handling; log the exact method and object state instead of interpreting the constant outside that contract.
- It can be returned during data-access wrappers that reduce HRESULT to a Boolean; log the exact method and object state instead of interpreting the constant outside that contract.
Because it is informational, a language binding may expose it as success and hide the symbolic distinction. Keep the original HRESULT available until the code-specific branch has run.
Evidence and telemetry
- preserve parameter ordinal and name.
- preserve requested and returned type metadata.
- preserve DBPARAMINFO flags.
- preserve provider error records.
- preserve whether the command was prepared or executed.
Also record db_s_paramunavailable_operation, db_s_paramunavailable_state_before, db_s_paramunavailable_state_after, UTC time, process and thread identifiers, component version, and a correlation ID. Collect it evidence with least disclosure: retain structure, sizes, IDs, and versions rather than secrets.
Correct handling and recovery
Inspect the parameter-specific status and provider error records. Continue only if the parameter is optional or can be derived from the command contract; otherwise request corrected metadata or reject execution before binding.
Retry it only when a documented input or state has changed. A blind retry of it can duplicate effects or conceal a terminal condition, so require a documented trigger.
Practical scenario
A command builder asks the provider for parameter metadata before preparing a stored procedure. One optional return parameter is unavailable, so it binds the documented input parameters only and records the provider version instead of inventing a type.
A regression test should reproduce it, assert the relevant outputs and state, then change only the decisive condition and verify the expected neighboring result or ordinary completion.
Difference from nearby results
DB_S_ERRORSOCCURRED reports mixed per-element results, while it is specifically about parameter information that the provider did not make usable.
Branching precisely on it prevents cancellation, pending work, and partial output from sharing one path.
References
- Microsoft: OLE DB return codes — official Microsoft material used to interpret it.
- Microsoft: OLE DB errors
- Microsoft: HRESULT values
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