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Re: [eclipselink-users] Duration of a simple object query
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You may also consider using a query cache, if you wish to avoid database
access.
See,
http://www.eclipse.org/eclipselink/api/1.1.2/org/eclipse/persistence/config/QueryHints.html#QUERY_RESULTS_CACHE
Holger Rieß-2 wrote:
>
>
> My query
> ...
> Query query = em.createNamedQuery("findStockTableByItemNumber");
> query.setParameter("itemnumber", itemNumber);
> retStockTable = (Stocktable) query.getSingleResult();
> ...
> needs about 15 ms if there is a record in the database and about 70 ms if
> there is no record (profiler).
>
> The named query is ...
> @NamedQuery(name = "findStockTableByItemNumber", query = "SELECT st FROM
> Stocktable st WHERE st.itemnumber = :itemnumber AND st.dataset = 'DAT'
> AND st.cKatalog = '001'", hints = {
> @QueryHint(name = QueryHints.CACHE_USAGE, value =
> CacheUsage.CheckCacheThenDatabase),
> @QueryHint(name = QueryHints.QUERY_TYPE, value = QueryType.ReadObject)
> }),
> ...
>
> About 40% of my queries have no result - this is a great problem for the
> performance of my application.
> There is no additional code for the handling of NoResultException.
>
>
-----
http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
http://www.eclipse.org/eclipselink/
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