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https://issues.apache.org/jira/browse/DERBY-5770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kristian Waagan updated DERBY-5770:
-----------------------------------
Attachment: derby-5770-1a-move_invalidation.diff
Attaching patch 1a, which moves the invalidation and removes the use of a
boolean variable in invalidateStatements.
> Reduce window of opportunity for queries being compiled without statistics on
> istat update
> ------------------------------------------------------------------------------------------
>
> Key: DERBY-5770
> URL: https://issues.apache.org/jira/browse/DERBY-5770
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.9.0.0
> Reporter: Kristian Waagan
> Assignee: Kristian Waagan
> Priority: Minor
> Attachments: derby-5770-1a-move_invalidation.diff
>
>
> Currently the invalidation of statements accessing a table is issued before
> dropping the old statistics and writing new ones. While we cannot guarantee
> that all compilations will see the new statistics (we can currently only drop
> all statistics for an index, so we cannot add the new ones first and then
> drop the old ones), we can do the invalidation after the work has been done
> to reduce the chances that queries are compiled without statistics at all.
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