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https://issues.apache.org/jira/browse/TRAFODION-3266?focusedWorklogId=192669&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-192669
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ASF GitHub Bot logged work on TRAFODION-3266:
---------------------------------------------
Author: ASF GitHub Bot
Created on: 31/Jan/19 05:47
Start Date: 31/Jan/19 05:47
Worklog Time Spent: 10m
Work Description: selvaganesang commented on pull request #1787:
[TRAFODION-3266] Change ustats base table accesses to SKIP CONFLICT ACCESS
URL: https://github.com/apache/trafodion/pull/1787
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Issue Time Tracking
-------------------
Worklog Id: (was: 192669)
Time Spent: 40m (was: 0.5h)
> UPDATE STATISTICS should use SKIP CONFLICT ACCESS when accessing the base
> table
> -------------------------------------------------------------------------------
>
> Key: TRAFODION-3266
> URL: https://issues.apache.org/jira/browse/TRAFODION-3266
> Project: Apache Trafodion
> Issue Type: Improvement
> Components: sql-cmu
> Affects Versions: 2.4
> Reporter: David Wayne Birdsall
> Assignee: David Wayne Birdsall
> Priority: Major
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Today, UPDATE STATISTICS uses READ UNCOMMITTED ACCESS when accessing the base
> table. Unfortunately, our engine maps this to READ COMMITTED ACCESS. In a
> scenario where data ingest happens continuously, this may lead to transaction
> conflicts between the full table scan done by UPDATE STATISTICS and data
> ingest transactions that wish to commit.
> By changing UPDATE STATISTICS to use SKIP CONFLICT ACCESS, we can avoid such
> conflicts.
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