[ http://jira.jboss.com/jira/browse/JBAS-331?page=history ]
Scott M Stark closed JBAS-331:
------------------------------
Resolution: Out of Date
> cache lists
> -----------
>
> Key: JBAS-331
> URL: http://jira.jboss.com/jira/browse/JBAS-331
> Project: JBoss Application Server
> Type: Bug
> Components: CMP service
> Versions: JBossAS-3.2.6 Final
> Reporter: SourceForge User
> Assignee: Scott M Stark
>
>
> SourceForge Submitter: morphace .
> Hi,
> apparently cache-lists are not cleared correctly.
> In my case I used JB3.2b3 but it is the same with 3.0.4.
> My OS: WinXP, JDK 1.4.1_01
> Yes, I have the CMP docs ... ;-)
> Here my standardjbosscmp-jdbc.xml settings:
> <read-ahead>
> <strategy>on-find</strategy>
> <page-size>500</page-size>
> <eager-load-group>*</eager-load-group>
> </read-ahead>
>
> <list-cache-max>1000</list-cache-max>
> I use commit-option B, instance per transaction
> configuration for my CMP EJB's.
> When you execute a finder (in my case a dynamic EJB-QL
> finder) JBossCMP uses the read-ahead mechanism to
> optimize loading. So far, so good.
> For example three entites A, B and C.
> A's relationship to B is (A) 1-n (B) with a foreign-key.
> B's relationship to C is (B) n-1 (C) with a foreign-key.
> The B entities are read-ahead correctly.
> Now, the second case:
> Three entites D, E and B.
> D's relationship to E is (D) 1-n (E) with a foreign-key.
> B's relationship to E is (E) n-1 (B) with a foreign-key.
> When you execute a finder on D the cache-lists from the
> first finder execution are used!
> I noticed, that read-ahead is only working for 1-n
> relationships :-(, not for n-1 (is it a bug ? Anyway,
> I'll submit it). So normally you should get a query for
> each B, which is the case if you do not execute the
> first query, but if you do it, the B's are read-ahead
> corresponding to the cache-lists of the first query!?
> I hope that I explained everything enough.
> TX
> Markus
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