A query is one of the basic units of EPL program execution.
The other basic unit is a monitor. A monitor cannot contain a query. A query cannot contain a monitor. For information about writing monitors, see
Defining Monitors.
Apama queries are suitable for applications where the incoming events provide information updates about a very large set of real-world entities.
The topics below provide information and instructions for defining queries.
For reference information, see
Queries.