Github user DaveBirdsall commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/379#discussion_r56195722
--- Diff: docs/cqd_reference/src/asciidoc/_chapters/histograms.adoc ---
@@ -51,10 +50,10 @@ being updated during that time. On the other hand, if
you are updating statistic
enough, and you want these to be picked up immediately by the compiler
because you have seen this to have a dramatic impact on plan quality, then you
can
make the refresh more frequent.
| *Production Usage* | Not applicable.
-| *Impact* | Longer histogram refresh intervals can
improve compile times. However, the longer the refresh interval the more
obsolete
-the histograms. That could result in poor performance for queries that
could leverage recently updated statistics.
+| *Impact* | Longer histogram refresh intervals can
improve compile times. However, longer refresh intervals yield more obsolete
+the histograms. More obsolete histograms may result in poor performance
for queries that could leverage recently updated statistics.
| *Level* | System or Service.
-| *Conflicts/Synergies* | Frequency of update statistics run either
using MAINTAIN or using Update Statistics Automation Server.
+| *Conflicts/Synergies* | Frequency of update statistics run either
using MAINTAIN.
--- End diff --
Suggest striking the word, "either"
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