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QUERY_RESULTS_CACHE vs CACHE_USAGE and QUERY_TYPE [message #1736554]

Thu, 30 June 2016 10:19

Alberto Gori

Messages: 2
Registered: June 2016

Junior Member

Can you explain me what is the difference between

@QueryHint(name = QueryHints.CACHE_USAGE, value=CacheUsage.CheckCacheThenDatabase),
@QueryHint(name = QueryHints.QUERY_TYPE, value = QueryType.ReadObject),

and just

@QueryHint(name = QueryHints.QUERY_RESULTS_CACHE, value = "true")

has hints on a NamedQuery?

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Re: QUERY_RESULTS_CACHE vs CACHE_USAGE and QUERY_TYPE [message #1736956 is a reply to message #1736554]

Mon, 04 July 2016 15:08

Chris Delahunt

Messages: 1389
Registered: July 2009

Senior Member

Query results can be cached, so that if you execute the same query again, it doesn't hit the database. Your other setting, CACHE_USAGE and QUERY_TYPE are completely different. QUERY_TYPE sets the query object used underneath, allowing finer control if you are familiar with native EclipseLink api, while CACHE_USAGE gives options on how the entity cache is referenced on the query to allow for in-memory querying and other options.

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