Isolated region : An isolated region is a logical subdivision of the Process Engine database. An isolated region consists of queues, rosters, and event logs
Roster: A roster is a database structure that stores the current location and other information about a work item. Process rosters provide the Process Engine software with an efficient way to locate a specific work item
Event Logs : An event log is a database structure that contains information about system-level events related to work item processing.
Queues: A queue is a database structure that holds work items
4 different types of queues are available in PE
A user queue is a queue that holds work items waiting to be processed by a specific user.
A work queue is a queue holding work items that can be completed by one of a number of users, rather than by a specific participant, or work items that can be completed by an automated process.
System queues are queues holding work items that are undergoing or waiting for processing by the Process Engine server
Component queue holds work items to be processed by component step in workflow. The components steps are to process a work item using an external component.
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