What does HRESULT 0x00040ECD (DB_S_DIALECTIGNORED) mean?

DB_S_DIALECTIGNORED

OLE DB processed command using the default dialect

DB_S_DIALECTIGNORED is HRESULT 265933 (0x00040ECD) from Microsoft OLE DB. The documented description is “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.
• This result can appear in portable consumers trying provider-specific SQL dialect identifiers; record the producing interface and method.
• It can appear in providers that recognize text but not the requested dialect GUID; record the producing interface and method.

Diagnostic sequence

• Capture the raw HRESULT 0x00040ECD immediately after the returning method and record whether the caller used SUCCEEDED, FAILED, equality testing, or exception translation.
• Verify the method-specific state: the command text has the same meaning under the provider default dialect and did not become unsafe or semantically different.

State to verify

The central question is whether the command text has the same meaning under the provider default dialect and did not become unsafe or semantically different.

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.

Evidence 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.

Difference from nearby HRESULT values

DB_S_TYPEINFOOVERRIDDEN concerns parameter metadata; it concerns interpretation of the command language.

Developer and administrator guidance

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.

References

• Microsoft: OLE DB return codes
• Microsoft: OLE DB Driver return codes
• Microsoft: OLE DB error records