As the saying goes, "Time is money." Devoting highly paid resources to menial tasks is a waste of money and resources. As the complexity of the business processes increases, so does the benefit of automating the process. This is indicated in Figure 1.1.
Figure 1.1. The bigger, more complex, and more frequent the task is, the more value can be gained from automation.
Humans are, well, human. We make mistakes far more frequently than computers do. By automating a series of tasks into a job and then creating a schedule for when that job should be executed, we can eliminate much of the chance for errors by simply removing humans from the equation.
Another advantage of job scheduling is scalability. We might be able to manually accommodate 10 or 20 jobs per hour, but the higher we go in job count, the harder it is to keep up without introducing errors in the jobs. With job scheduling, we are limited only by hardware resources.
So we can safely say that automation through job scheduling offers at least these three advantages over a similar manual approach:
Uses for Job Schedulers in the Enterprise
Scheduling in the Enterprise
Getting Started with Quartz
Cron Triggers and More
JobStores and Persistence
Implementing Quartz Listeners
Using Quartz Plug-Ins
Using Quartz Remotely
Using Quartz with J2EE
Quartz and Web Applications
Using Quartz with Workflow
Appendix A. Quartz Configuration Reference