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  • The datomic.com database is closer to the user than the traditional relational ones. Are you only looking at the traditional databases? Commented Jan 4, 2013 at 3:30
  • @Job No, relational databases are not the only thing that I'm considering here. It's more about understanding the difference between data structures in logic versus the data structures in the database/persistence unit. Commented Jan 4, 2013 at 3:37
  • As a general rule I would say - use a database if you can, but if it becomes too slow, then resort to using the data structures. Data duplication (e.g. caching) is bad because you have to keep the two in sync, so avoid it unless you cannot. Commented Jan 4, 2013 at 3:50
  • Send data to a database only to sort it? Like driving around the block to change your mind? Commented Apr 6, 2016 at 16:31