Abstract: Techniques for processing events in parallel are provided. Multiple publishers publish events in parallel to a plurality of channels. Each channel is a queue that maintains a list of events that are awaiting to be processed by one or more slave processes. In one approach, all events that need to be persistent are published to a persistent channel, whereas all events that do not need to be persistent are published to one or more in-memory channels. In another approach, for each event, a publisher determines which channel of the plurality of channel to publish the event. The determination is based, at least in part, on the number of events in each channel and, optionally, the type of each event in each channel. In either approach, each event from a single publisher is published to the same channel.

Abstract: Techniques for grouping events in a computing system are provided. A registrant sends, to a database server, a request to register to receive a single notification based the occurrence of multiple events that satisfy certain criteria, referred to as grouping attributes. Such registrations are referred to as grouping registrations. An eventing mechanism in the database server receives and maintains grouping registrations. When an event is received, the eventing mechanism determines whether the event has been registered for in an active grouping registration, i.e., one whose start time has passed but whose completion criteria are not yet satisfied. If so, then the eventing mechanism updates grouping data associated with the grouping registration. When the completion criteria of a grouping registration are satisfied, the eventing mechanism sends a notification to the registrant and/or other intended recipient(s).