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Within a VWService, a Process Engine
runs the Process Service
software, which enables workflow activity. Each Process Engine
is uniquely identified as "VW Server<number>,"
where the number is system-assigned, starting with 0 and incrementing
by 1. The server assigned ID number 0 is the primary Process Engine
for its VWService. Certain data and software components used throughout
a VWService reside only on this server.
The illustration at left represents a VWService (rosa)
with three Process Engines:
Server 0 (rosa),
Server 1, and Server
2.
When there are multiple Process Engines
in a VWService, you can assign component
queues, rosters
and work
queues to a specific Process Engine.
Tables used for user queues, system queues, event logging, and statistics,
however, are replicated on each server. The Process Engine
on which the activity takes place determines the actual table used
for a transaction.
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