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DB_E_NOPROVIDERSREGISTERED
Meaning
Windows documents DB_E_NOPROVIDERSREGISTERED as “No OLE DB providers of this source type are registered”. In this case, provider enumeration for the requested source type finds no registered OLE DB providers.
Relevant contract
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.
Conditions that specifically lead to the result
- Cause 1: the required provider is not installed.
- Cause 2: registration is missing for the current process architecture.
- Cause 3: the requested source type has no compatible provider.
Evidence to collect
When recording diagnostic 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: requested source type.
- Evidence 2: 32-bit or 64-bit process architecture.
- Evidence 3: provider CLSID and registry presence.
Diagnostic sequence
- Identify the exact failing stage: provider enumeration for the requested source type finds no registered OLE DB providers.
Corrective actions
- Action 1: install and register a supported provider.
- Action 2: match application architecture to provider registration.
- Action 3: surface a clear deployment prerequisite instead of retrying discovery.
Retry and recovery
Retry rule: retry after a compatible provider has been installed and registered.
Practical scenario
A 64-bit service cannot see a provider registered only for 32-bit clients; installing the matching build restores enumeration.
Difference from nearby HRESULT values
REGDB_E_CLASSNOTREG is a general COM class registration failure, while DB_E_NOPROVIDERSREGISTERED is OLE DB provider discovery for a source type.
Official Microsoft references
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