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DB_E_MISMATCHEDPROVIDER
Exact value and result class
DB_E_MISMATCHEDPROVIDER has unsigned value 2147749493 (0x80040E75) and signed 32-bit value -2147217803. AllStat describes it as “Initialization string specifies a provider that does not match the active provider”. In this result, an initialization string names a provider different from the provider represented by the active data source object.
The high bit is set, so this result is a failure HRESULT. Its facility is 4 (FACILITY_ITF) and its low code is 3701 (0x0E75). These fields identify an interface-defined result family; they do not identify the provider instance, method, object generation or partial effects.
Contract boundary
OLE DB initialization strings select a provider and set initialization properties before IDBInitialize::Initialize. Syntax errors, missing provider registration and a provider mismatch are distinct from server connectivity and authentication failures.
Investigation of this result should start with the uninitialized data source object, parsed initialization properties and provider CLSID or ProgID. Capture it before ADO, ATL,.NET or a database abstraction layer replaces the native HRESULT with a generic exception.
Evidence to collect
A useful this result event records provider CLSID and version, process architecture, interface IID and method, object correlation ID, transaction state and the immediately preceding HRESULT. When recording it data involving passwords, tokens, server names and complete connection strings, use types, lengths, hashes or redacted identifiers rather than secrets or complete business data.
- Evidence 1 for it: active provider CLSID and ProgID.
- Evidence 2 for it: provider specified by the parsed string.
- Evidence 3 for it: factory or pool key that created the data source object.
Conditions that specifically lead to it
- Cause 1 for it: a generic connection string is applied to a precreated provider object.
- Cause 2 for it: pool metadata and connection-string provider fields diverged.
- Cause 3 for it: a wrapper retained a Provider property while switching factories.
Diagnostic sequence
- Capture raw
0x80040E75and symbolic it at the native call boundary. - Identify the exact failing stage for it: an initialization string names a provider different from the provider represented by the active data source object.
- Retrieve all OLE DB error records for it before another COM call replaces thread error information.
- Compare the live object state and provider-granted capabilities with the input that produced it.
- Reduce the operation to the smallest case that preserves the same init contract.
- Apply one evidence-backed correction for it and verify that the result is not merely replaced by a neighboring HRESULT.
Retry and recovery
Retry rule for it: retry after aligning the active data source object with the provider specified by the initialization properties. A it retry is safe only when the relevant input, object generation, capability or external state has changed. Before replaying a modifying call that returned it, determine whether rows, schema objects or URL resources were partially created or changed.
Do not turn it into an unbounded retry loop. Preserve cancellation for it and use a fresh provider object when the failed call may have left local state ambiguous.
Corrective actions
- Action 1 for it: remove redundant provider selection when using a fixed provider object.
- Action 2 for it: create the object for the provider named by the string.
- Action 3 for it: include provider identity in pooling and configuration keys.
Practical scenario
A pool reuses a SQL provider object for a Jet connection string; provider-aware pool keys prevent the mismatch. Keeping it with the method and object state makes this scenario diagnosable instead of reducing it to “database error”.
Developer and operations guidance
Code handling it should release COM objects in ownership order, retain per-row, per-column or per-property statuses, and log granted capabilities rather than only requested options. While handling it, opaque values such as HACCESSOR, HROW, HCHAPTER, DBID components and provider handles must remain scoped to the object that issued them.
Operational dashboards for it should group by provider version, interface, method and normalized failure stage. A it event must not expose passwords, tokens, full connection strings, unrestricted command text or raw row contents.
Difference from nearby HRESULT values
DB_E_BADINITSTRING means the string is malformed, while it means valid properties select a different provider. Telemetry and remediation for it should keep these outcomes distinct.
Official Microsoft references
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