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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3575) Optimize client side LOB release mechanism by reducing the number of round-trips
Date Mon, 31 Mar 2008 11:06:24 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kristian Waagan updated DERBY-3575:

    Fix Version/s:

Setting fix version to indicate I want to get this in for 10.4.

> Optimize client side LOB release mechanism by reducing the number of round-trips
> --------------------------------------------------------------------------------
>                 Key: DERBY-3575
>                 URL: https://issues.apache.org/jira/browse/DERBY-3575
>             Project: Derby
>          Issue Type: Improvement
>          Components: Network Client
>    Affects Versions:,
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>            Priority: Minor
>             Fix For:,
> The current mechanism for freeing LOB locators from the client driver, is to invoke a
stored procedure for each LOB locator every time the result set position is changed. This
can potentially result in a number of round-trips to the server.
> The mechanism can easily be optimized by adding a stored procedure that takes a list
of LOB locators and frees them all. The level of optimization can be tweaked by changing the
timing of the stored procedure invocation, and this must also be balanced with regards to
resource consumption on the server. The more LOB locators we collect on the client before
we send the release request, the more memory is bound to LOB resources on the server.
> Possible release points:
>  * on each result set positioning
>  * when a threshold value is reached
>  * on result set close
>  * when Blob/Clob.free is called (problematic, as the Blob/Clob is detached from the
result set)
> There are some compatibility issues to consider, and the client driver will most likely
have to implement both the naive and the optimized mechanism. For this reason, it might be
good if the release mechanism can be tightly encapsulated (for instance within LOBStateTracker).
> Note that piggy-backing the locators would be the most effective solution, but it is
likely that implementing it requires more time and thus I'm reluctant to do so this close
to the release. I'm saying this because we do need a fix to go into 10.4.

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