[ https://issues.apache.org/jira/browse/OPENJPA-1329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rick Curtis closed OPENJPA-1329.
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    Resolution: Not A Problem
      Assignee: Rick Curtis

> But I don't know when the cache should be accessed to improve the performance? Is there any best practice for it ?

>From the user manual: 

Most caches are of limited size. Pinning an identity to the cache ensures that the cache will not kick the data for the corresponding instance out of the cache, unless you manually evict it. Note that even after manual eviction, the data will get pinned again the next time it is fetched from the store. You can only remove a pin and make the data once again available for normal cache overflow eviction through the unpin methods. Use pinning when you want a guarantee that a certain object will always be available from cache, rather than requiring a datastore trip. 

Please reopen this JIRA if you have any additional questions.

Thanks,
Rick
                
> Looking for best practice for use DataCache API
> -----------------------------------------------
>
>                 Key: OPENJPA-1329
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1329
>             Project: OpenJPA
>          Issue Type: Question
>          Components: datacache
>    Affects Versions: 1.2.1
>         Environment: windows/linux
>            Reporter: Leilei Zhou
>            Assignee: Rick Curtis
>
> I'm looking into OpenJPA's datacache. Config the cache enabled/disabled, cache size is not a problem and they do improve the performance. But from the guides, I can use OpenJPA's StoreCache/QueryCache extension to access(evict,pin...) the cache. 
> But I don't know when the cache should be accessed to improve the performance? Is there any best practice for it ? 

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