Ran into James Gosling promoting hash maps and RAM as an alternative to SQL. My team has as positive experience with this approach. Coupling it with JoSQL for a SQL-like syntax we can query our object collections. Adding a ZQL ANSI SQL parser and some simple AST editing, we can take pure SQL where clauses and find matching objects in our maps, performantly too. Custom SQL functions are a bonus.
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JFilter http://code.google.com/p/jfilter/ is also a similar open source libray which lets you write your queries in json format like mongodb queries. It is high performance but simple api to use.
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