It s special because the information contained within cannot be updated, but it may be used for viewing and reporting. Since a significant load on the system comes from updating data, RPT is exempted from this activity. As such, it runs more quickly. Another way to improve system performance and to get your reports when they are required is to consider when the system is busiest and then to run reports outside of this time period. P.M. Scheduling ensures that reports are run when required without your intervention.
Interactive jobs use many more system resources than background jobs.
The more requests put to the system concurrently, the greater the drain on processing power and the slower the system will be to all users. The order preparation process could occur in 2 ways. In the first, Biff starts picking his first order in the morning and as subsequent orders arrive he starts picking them too. Every time a new order appears he has to run back to the job jar and interrupt the order in progress. The effect of the constant interruption is to delay the processing and completion of a single order while many are being worked upon.