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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5698) Document performance issue with 2-arg versions of setXXXStream methods for LOBs
Date Thu, 10 May 2012 20:34:49 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13272728#comment-13272728
] 

Dag H. Wanvik commented on DERBY-5698:
--------------------------------------

Thanks, Kim. Looks good to me, but I am not familiar with the original performance issue here.

                
> Document performance issue with 2-arg versions of setXXXStream methods for LOBs
> -------------------------------------------------------------------------------
>
>                 Key: DERBY-5698
>                 URL: https://issues.apache.org/jira/browse/DERBY-5698
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 10.8.2.2
>            Reporter: Kim Haase
>            Assignee: Kim Haase
>         Attachments: DERBY-5698.diff, DERBY-5698.stat, DERBY-5698.zip
>
>
> The PreparedStatement.setAsciiStream and other methods have a 3-arg form that includes
the length of the stream and a 2-arg form that does not. If the 2-arg form is used, Derby
has to calculate the length every time the method is called. With LOBs, especially large ones,
this can cause a major performance impact, especially if the method is called repeatedly.
This should be documented where appropriate.
> Kristian, please feel free to correct or amplify anything I've said here.

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