The Scheduler tables

The Scheduler stores information about tasks and sensors in five tables in the sysadmin database: ph_task, ph_run, ph_group, ph_alert, and ph_threshold.

The Scheduler is an administrative tool that enables the database server to execute database functions and procedures at predefined times or as determined internally by the server. The five tables used by the Scheduler contain built-in tasks and sensors that run automatically. You can also add your own tasks and sensors by inserting rows into these tables. These tables have relationships between their columns that are described in the following illustration.

Figure 1. Relationships between the Scheduler tables
The tk_name column of the ph_task table is mapped to the task_name column of the ph_threshold table. The tk_id column of the ph_task table is mapped to the run_task_id column of the ph_run table and the alert_task_id column of the ph_alert table. The tk_sequence column of the ph_task table is mapped to the run_task_seq column of the ph_run table and the alert_task_seq column of the ph_alert table. The tk_group column of the ph_task table is mapped to the group_name column of the ph_group table.

For detailed information about using the Scheduler, see the Informix® Administrator's Guide.