Steve Ebersole ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiOGQxYzlmYWUy... ) / Deprecation ( https://hibernate.atlassian.net/browse/HHH-16441?atlOrigin=eyJpIjoiOGQxYz... ) HHH-16441 ( https://hibernate.atlassian.net/browse/HHH-16441?atlOrigin=eyJpIjoiOGQxYz... ) Improve support for @BatchSize ( https://hibernate.atlassian.net/browse/HHH-16441?atlOrigin=eyJpIjoiOGQxYz... ) Change By: Steve Ebersole ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) During the development of 6.x Specifically , there are 2 aspects of batch fetch support that can be improved - # Cache generated SQL AST and friends when possible # Implement support for different strategies for handling batch-size in different scenarios - ala legacy {{BatchFetchStrategy}} as applied to {{@BatchSize}} for entity and collection fetches was not ported due to time constraints. In If the interim, {{BatchFetchStrategy}} was deprecated.  Which is fine.  I think the strategy for entity and collection thing being batch fetching should be fetched has a mix {{DYNAMIC}} and {{PADDED}} single-column key , offer support for loading based on a single SQL ARRAY parameter.  Otherwise, fallback to the outcome of “padded” strategy (though potentially partitioning the underlying fetching into smaller chunks depending on {{Dialect#getDefaultBatchLoadSizingStrategy}}. The current implementation implements For the {{DYNAMIC}} ARRAY strategy. When {{PADDED}} is used , we should cache the generated SQL AST look at supporting that for multi-load also. When {{DYNAMIC}}, we should maybe offer some limited caching of SQL AST(s). ( https://hibernate.atlassian.net/browse/HHH-16441#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16441#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100221- sha1:916089c )