[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5686) Collections should be loaded by default using "lazy collection fetch" instead of "extra lazy collection" fetch
Srinivas Nandina (JIRA)
noreply at atlassian.com
Sat Oct 23 03:19:48 EDT 2010
Collections should be loaded by default using "lazy collection fetch" instead of "extra lazy collection" fetch
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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
Priority: Minor
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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