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https://issues.apache.org/jira/browse/TRAFODION-2673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068486#comment-16068486
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ASF GitHub Bot commented on TRAFODION-2673:
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Github user asfgit closed the pull request at:
https://github.com/apache/incubator-trafodion/pull/1154
> Improve performance of incremental UPDATE STATISTICS
> ----------------------------------------------------
>
> Key: TRAFODION-2673
> URL: https://issues.apache.org/jira/browse/TRAFODION-2673
> Project: Apache Trafodion
> Issue Type: Improvement
> Components: sql-cmp
> Affects Versions: 2.2-incubating
> Environment: All, but most noticeable on large sample tables
> Reporter: David Wayne Birdsall
> Assignee: David Wayne Birdsall
>
> When running an incremental UPDATE STATISTICS utility, rows satisfying the
> WHERE clause are first deleted from the sample table, then replaced with a
> new sample taken from the base table.
> The statement used to delete rows from the sample table is a vanilla DELETE,
> which performs poorly when the set of rows to be deleted is large. It would
> be better (and much faster) to use DELETE NO ROLLBACK.
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