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https://issues.apache.org/jira/browse/DERBY-5684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13278792#comment-13278792
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Kristian Waagan commented on DERBY-5684:
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I have decided to pull the plug on the possible optimization for foreign key
indexes. I don't understand it well enough, and it is hard to verify what it
actually does wrt the choices taken by the optimizer.
With that decision, the following pieces remain:
a) Drop disposable statistics entries. I will post the patch under DERBY-5680.
b) Skip statistics for single-column primary keys. I will post the patch under
DERBY-3790 after (a) is done.
c) Move invalidation when updating statistics. Committed as DERBY-5770.
> Explore possible istat daemon improvements and optimizations
> ------------------------------------------------------------
>
> Key: DERBY-5684
> URL: https://issues.apache.org/jira/browse/DERBY-5684
> Project: Derby
> Issue Type: Task
> Reporter: Kristian Waagan
> Attachments: derby-istat-exploration-1.diff,
> derby-istat-exploration-2.diff, derby-istat-exploration-3.diff,
> derby-istat-exploration.diff
>
>
> A task tracking some experiments on the istat daemon and the statistics
> update code.
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