[hibernate-issues] [Hibernate-JIRA] Resolved: (HHH-5686) Collections should be loaded by default using "lazy collection fetch" instead of "extra lazy collection" fetch

[Adam Warski (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Warski resolved HHH-5686.
------------------------------

         Assignee: Adam Warski
       Resolution: Fixed
    Fix Version/s: 4.0.0.Alpha1
                   3.6.1

> Collections should be loaded by default using "lazy collection fetch" instead of "extra lazy collection" fetch
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-5686
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5686
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: envers
>    Affects Versions: 3.6.0
>         Environment: Works fine with in-memory database like H2 but for MySQL5 generates too many queries. 
>            Reporter: Srinivas Nandina
>            Assignee: Adam Warski
>            Priority: Minor
>             Fix For: 3.6.1, 4.0.0.Alpha1
>
>
> If an entity has a collection (either entities or components), then loading the collection from audit tables one query is issued per element of collection rather than issuing one query for the whole collection. Because of this while loading huge object graphs from audit tables, large number of queries are issued and taking long time to load the data.
> Default option to load collections should be changed from "extra lazy collection fetch" to "lazy collection fetch".
> More details can be found at the discussion in the forum:
> http://community.jboss.org/message/567086

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