Use these command-line utilities to connect to and issue commands to Event Stream Processor.
Each Event Stream Processor instance has a single Command and Control server thread that handles requests for information (metadata) or instructions to perform tasks such as quiesce or shutdown.
The esp_cnc and esp_client utilities send directives to Event Stream Processor via this process. These utilities enable you to control the running Event Stream Processor from the command-line.
The esp_query On-Demand SQL Query utility uses this process to send requests for information to Event Stream Processor. See the On-Demand Queries topic for more details.