Information Technology Reference
In-Depth Information
FIGURE 8.5
An active process in ActiveBPEL administration console.
8.20
In-memory persistence is a major disadvantage as the process information
lost in server shutdown is unrecoverable. A server may be shut down on
purpose (e.g., for system maintenance) or, in most cases, due to unexpected
failures. The persistence framework of ActiveBPEL can be coni gured to
integrate with various RDBMS; for example, MySQL, Oracle, SQL Server,
and DB2. PostgreSQL, as default choice of database of OMII infrastruc-
ture, is also supported. A large amount of information will persist in
order to restore the engine state from corruptions such as process states,
logs, variables, alarms, message queues, and so on. The engine will then
be brought back to the state when the last transaction in database has com-
pleted in the event of failure. The admin console will also be restored and
can be used as it was before the restart.
Persistence
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