All the job, schedule, and scheduled job information, and data needed by the Job Scheduler task for internal processing is stored in the sybmgmtdb database.
Most access to data in the sybmgmtdb database is via stored procedure, which make data available to the GUI, the JS Agent, and the command line interface. Only the Job Scheduler task accesses data directly from the sybmgmtdb database.
See the Job Scheduler Users Guide.