query

A self-contained processing unit. It partitions incoming events according to a key and then independently processes the events in each partition. Processing involves watching for an event pattern and then executing a block of procedural code when that pattern is found.

input

An event type that a query operates on. An input definition specifies an event type plus details that indicate how to partition incoming events and what state, or event history, is to be held.

key

A query key identifies one or more fields in the events being operated on. Each input definition must specify the same key.

partition

A partition contains a set of events that all have the same key value. One or more windows contain the events added to each partition.

window

For each input, a window contains the events that are current. The query operates on only current events.

latest event

The latest event is the event that was most recently added to a partition.

set of current events

The events that are in the window(s) of a partition.

pattern

Specification of the event or sequence of events or aggregation that you are interested in. A pattern can include conditions and operators.

match set

A match set is the set of events that matches the specified pattern. A match set always includes the latest event.

parameterization

A query definition that specifies parameters is a parameterized query. An instance of a parameterized query is referred to as a parameterization.