Data layer

I remember I was thinking that there were some gray areas when it comes to datasets and foundsets, and generally how Servoy is generating the SQL from these depending on relations etc. I noticed that there were often questions about that in the forum, and no definitive answers of course (but at least pointers to what approach gives you what), and in my company too, people are coming to me quite often with some of the following questions:

1. the 200 records loaded in a batch, and how to treat it correctly
2. databaseManager.loadRecords() different flavors and what it does exactly
3. how Servoy is treating DB Views (no refreshing, need to manually add the PK(s))
4. calculations and aggregations and how/why they will deteriorate performances (what is the SQL involved especially in case of table/list forms)
5. about dataBroadcast, how they act on foundsets but not datasets (nor foundsets based on views)
6. dataBroadcast again: how to refresh you client's data after a batch (processor) update (maybe demonstrate the new headless_client plugin?)
7. how to use the JSFoundsetUpdater properly, and how to efficiently update a whole foundset in one go
8. the use of databaseManager.setCreateEmptyFormFoundsets() and what it means
9. the advantage of using valueLists instead of relations to display related data in table/list forms
10. how/why Servoy is sometimes creating temporary table to perform some joins
11. generally how to interpret the performance tab in the server admin

Seems like a lot of topics in one, really, but of course not necessarily all of these topics need to be addressed, or addressed at the same time, but I really think that these are things that need more explanations/clarifications/demonstrations.