[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3011) merge() optimization for Oracle dialect

[MG (JIRA)]

merge() optimization for Oracle dialect
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                 Key: HHH-3011
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3011
             Project: Hibernate3
          Issue Type: Improvement
          Components: core
            Reporter: MG
            Priority: Minor


merge() optimization for Oracle dialect.
Since 9i Oracle has a MERGE statement which is very useful to save round trips to database in merge() call
which will make dramatic improvement for performance  of loading large row sets.

MERGE command processes the conditional INSERT-or-UPDATE within a single statement.

So instead of doing 'select' first to detect whether entity is in database or not (This is one round trip to DB)
and then issuing 'update' or 'insert' all of it could be done in one statement with no extra round trips using oracle SQL MERGE statement.

http://www.oracle.com/technology/products/oracle9i/daily/Aug24.html



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