Data Warehousing 101

Except for the languages listed, that's what I've got. I found Neo4J difficult because of the lack of flexibility in defining relationships, ie they couldn't be dynamic. At times I even toy with the idea of doing something on my own at the file system level, but it's just not worth the effort, esp trying to redo a lot of the features that the Postgres folks have worked so hard over the years to develop. And I'm sure I could never approach their level of scalability on my own. Thanks for the input.