Why should I optimize batch jobs as well, since their runtime actually does not matter, given that it takes place at night?
If batch jobs (background jobs) load an unnecessarily large amount of data into the data cache due to missing indexes in the post-processing, and this impairs the data cache hit rate, you can assume that the application data of the daily business has been displaced from the data cache to the hard disk. This data must be loaded back into the cache from the hard disk at start of the daily business when you execute the applications. The nightly background jobs are thereby indirectly responsible for poor response times when you start the dialog daily business. This means that you also need to optimize jobs that run in the night.
