I am evaluating OrientDB right now and I tried to inserts 1.2 million 
simple records inside one of the database. It is an Employee class with 
just few columns. 

When I tried to perform the query on SELECT * FROM Employee WHERE salary = 
1343 it was very slow and ended up no result being returned. I did some 
indexing and now it became very fast. 
However, when I tried to again change the query a little bit to this SELECT 
* FROM Employee WHERE salary >= 3330 AND salary <= 3330 it ended up return 
nothing again and prompted me the transactions is more than 50,000 records 
and ... As a matter of fact, there is only 1 record inside which fulfill 
this search criteria. Could anyone let me know how to tune the performance 
in such case? Thanks.

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