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From "Kevin Sutter (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-407) Cache SQL (or closer precursors to SQL) more aggressively
Date Wed, 23 Apr 2008 22:11:21 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591820#action_12591820
] 

Kevin Sutter commented on OPENJPA-407:
--------------------------------------

Although the previously posted patch helped with performance on an individual EM basis, that
was not sufficient when we pushed it through more scalable tests.  So, the patch has been
re-worked to cache across EMs.  The basic concept is the same, but now the cache is longer
lived and provides scalable performance improvements.

As soon as the testcases and doc updates are done, the new patch will be posted for comments.
 Hopefully, this version can be committed in the near future.

Thanks,
Kevin

> Cache SQL (or closer precursors to SQL) more aggressively
> ---------------------------------------------------------
>
>                 Key: OPENJPA-407
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-407
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: jdbc, kernel, query, sql
>    Affects Versions: 0.9.0, 0.9.6, 0.9.7, 1.0.0
>            Reporter: Patrick Linskey
>             Fix For: 1.1.0
>
>         Attachments: findBy.patch, OPENJPA-407.patch, OPENJPA-407.patch
>
>
> When data is not available in the data cache, OpenJPA dynamically creates SQL to look
up the requested data. OpenJPA should more aggressively cache this SQL to accelerate pathways
from a cache miss to the database.
> The generated SQL takes a number of factors into account, including the requested records,
transaction status, currently-loaded data, and the current fetch configuration. Any caching
would need to account for these factors as well.

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