March 2010
Intermediate to advanced
408 pages
9h 59m
English
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Coherence query limitations
You have probably noticed by now that all the filters we have used as examples are evaluated against a single cache. This is one of the limitations of the Coherence query mechanism—it is not possible to perform an equivalent of a table join and execute the query against it.
However, while the ability to execute queries across multiple caches would come in handy occasionally, this is not too big a problem in practice. In most cases, you can perform any necessary table joins before loading the data into the cache, so you end up with all the information you need to query on in a single cache. Remember, the purpose of Coherence is to bring data closer to the application in a format that is easily consumable by the application, ...
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