In this chapter, we have learned that understanding not just the volume of records, but also how data within them is dispersed can affect the need for indexes to ensure that queries perform without having to resort to expensive table scans or, in the case of Apex Trigger, runtime exceptions. Ensuring that you and your customers understand the best way to apply indexes is critical to both interactive and batch performance.
Asynchronous execution contexts open up extended and flexible control over the governors available in the interactive context, but need to be designed from the beginning with careful consideration for the user experience, such that the user is always aware of what is and is not going on in the background. Messaging is the key when there is no immediate user interface to relay errors and resolve them. Don't depend on the Apex Jobs screen; instead, try to contextualize error information through custom log objects related to key records in your application that drive...
