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Date: Mon, 21 May 2012 15:42:41 +0000 (UTC)
From: "Kim Haase (JIRA)" <jira@apache.org>
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Subject: [jira] [Closed] (DERBY-5698) Document performance issue with 2-arg
 versions of setXXXStream methods for LOBs
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     [ https://issues.apache.org/jira/browse/DERBY-5698?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kim Haase closed DERBY-5698.
----------------------------


Changes have appeared in Latest Alpha Manuals.
                
> 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
>             Fix For: 10.9.0.0
>
>         Attachments: DERBY-5698-2.diff, DERBY-5698-2.zip, DERBY-5698-3.diff, DERBY-5698-3.zip, 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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