Distributed Action Handler 25.4
Distributed Action Handler Help

# MaxVDBEngines

The maximum number of servers mapped to by a virtual database (VDB) that the Distributed Action Handler queries before returning a (possibly null) result.

This option is used for distributor VDBs that map to servers running in non-mirror mode, and applies to all of them. If the first server queried does not return a result, the Distributed Action Handler sends the query to the next server.

`MaxVDBEngines` gives the user greater control in the time spent servicing a query than that given by EngineMaxRetries or EngineTimeout, and is potentially useful if a VDB maps to many servers. If not set, then all servers mapped to by the VDB might be queried before results are returned.

Type: | Long
Default: | 5
Allowed Range: | Minimum: 1 Maximum: 1024
Recommended Range: | Minimum: 2 Maximum: 5
Required: | No
Configuration Section: | Server
Example: | `MaxVDBEngines=3`
See Also: | EngineMaxRetries EngineTimeout

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Version 25.4 | Last updated October 2025

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Product: Knowledge Discovery Distributed Action Handler 25.4

Topic Title: MaxVDBEngines