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DB_S_DIALECTIGNORED
OLE DB processed command using the default dialect
DB_S_DIALECTIGNORED is HRESULT 265933 (0x00040ECD) from Microsoft OLE DB. AllStat describes this result as “Input dialect was ignored and command was processed using default dialect.” The high-order severity bit is clear, so this is a success result, but it carries more information than plain S_OK.
The provider ignored the requested command dialect and executed or prepared the command using its default dialect.
Where the result is encountered
- This result can appear in ICommandText::SetCommandText or related command setup; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- This result can appear in portable consumers trying provider-specific SQL dialect identifiers; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- It can appear in providers that recognize text but not the requested dialect GUID; record the producing interface and method rather than inferring behavior from the symbolic name alone.
The same numeric success value can be mishandled when a wrapper exposes only a Boolean. Keep the original HRESULT until the code-specific outputs and state transition have been evaluated.
Diagnostic sequence
- capture the raw HRESULT
0x00040ECDimmediately after the returning method and record whether the caller usedSUCCEEDED,FAILED, equality testing, or exception translation. - Identify the exact owner of it: interface, method, object instance, provider or filter version, thread or apartment, and operation phase.
- Validate the decisive contract boundary for it: the command text has the same meaning under the provider default dialect and did not become unsafe or semantically different.
- inspect every output parameter, count, status array, returned interface, or side effect that the method documentation associates with this success-with-information result.
- Compare the observed state before and after it; do not assume that a success severity bit means every optional sub-operation completed.
- reproduce the smallest request with the same object state and then change only the condition identified by the evidence before repeating the operation.
State boundary that must be proved
The central question for it is whether the command text has the same meaning under the provider default dialect and did not become unsafe or semantically different. The HRESULT alone confirms neither unrelated work nor the quality of optional outputs.
A reliable interpretation of it names the exact method contract, the object generation, and the outputs that remain valid. This prevents a success-with-information result from being promoted to full success or demoted to a generic error.
Correct handling, retry, and recovery
Accept only after validating semantics under the default dialect. Rewrite or reject commands that depend on dialect-specific quoting, functions, parameter syntax, or transaction behavior.
Retry it only when the recorded state can change the documented outcome. Repeating the same call is inappropriate for a stable end marker, cancellation, unsupported format, adjusted property, or partial result whose completed side effects have not been reconciled.
Evidence and telemetry to preserve
- preserve requested dialect GUID.
- preserve effective dialect.
- preserve command text hash and parameters.
- preserve provider identity and version.
- preserve result schema and execution plan.
Also record db_s_dialectignored_operation, db_s_dialectignored_object, db_s_dialectignored_state_before, db_s_dialectignored_state_after, UTC time, process and thread identifiers, and a correlation ID. Keep secrets out of logs while retaining GUIDs, CLSIDs, media subtypes, property IDs, row identities, and hashes needed to distinguish objects.
Difference from nearby HRESULT values
DB_S_TYPEINFOOVERRIDDEN concerns parameter metadata; it concerns interpretation of the command language.
This distinction determines whether the caller should consume partial outputs, stop iteration, wait, reconfigure, notify the user, or perform no error recovery at all.
Developer and administrator guidance
Tests for it should verify both the encoded condition and the resulting outputs. A test for it that checks only SUCCEEDED cannot detect stale counts, partial streams, adjusted properties, missing callbacks, or other code-specific effects.
A support report for it should include decimal 265933, hexadecimal 0x00040ECD, the AllStat meaning, the owning API, and the first detailed status or output that explains why the method did not return ordinary S_OK.
Practical validation scenario
A tool requests a vendor dialect but the provider falls back to default SQL. A compatibility test catches a vendor-specific function, so the tool rewrites the expression before execution.
The negative test should preserve the condition that produces it; the recovery test should alter only that condition and verify the final state as well as the HRESULT.
References
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