This figure illustrates a typical RAC architecture and how the Scheduler works with it. It shows the following elements:

• A database, which contains a Job Table.
• A Job Table, which contains Job1, Job2, Job3, Job4, Job5, and Job6.
• Instance 1, Instance 2, and Instance 3.
• Job Coordinator 1, which controls three job slaves.
• Job Coordinator 2, which controls three job slaves.
• Job Coordinator 3, which controls three job slaves.
• Nine job slaves.

Also, the following relationships apply:

• Job Coordinators 1, 2, and 3, which each control three slaves.
• Instance 1, which works with Job Coordinator 1.
• Instance 2, which works with Job Coordinator 2.
• Instance 3, which works with Job Coordinator 3.
• The three Job Coordinators, which exchange information among themselves.