Coherence, magic trick with cache index

A technical article related to Oracle Coherence.

Oracle Coherence has ability to query data in cache not only by key, but by values (or their attributes). Of course queering by secondary attributes is not as efficient as by primary key, but still can be very useful. Oracle Coherence also supports indexes which improve performance of value based queries significantly.
But some times index may not behave exactly as you expect.

Full text of article is available at GridDynamics blog - http://blog.griddynamics.com/2010/10/coherence-magic-trick-with-cache-index.html