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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4833) Prepare existing JUnit tests for running with automatic index statistics generation
Date Fri, 17 Dec 2010 10:26:01 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972429#action_12972429
] 

Knut Anders Hatlen commented on DERBY-4833:
-------------------------------------------

It sounds reasonable to wait and see if intermittent failures start appearing in those test,
and addressing all in one go if they do. Since the statistics updates don't kick in unless
the tables are above a certain minimum size, it might not be a problem in most of those tests
anyway.

> Prepare existing JUnit tests for running with automatic index statistics generation
> -----------------------------------------------------------------------------------
>
>                 Key: DERBY-4833
>                 URL: https://issues.apache.org/jira/browse/DERBY-4833
>             Project: Derby
>          Issue Type: Task
>          Components: Test
>    Affects Versions: 10.7.1.1
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>            Priority: Minor
>         Attachments: derby-4833-1a-orderbyandsortavoidancetest_adjustment.diff, derby-4833-2a-updatelocks_disable_autostats.diff
>
>
> During prototyping of a mechanism to create and update index statistics automatically
(see DERBY-4771) it turned out that some of the tests fail due to the presence of [improved]
index statistics.
> Where appropriate the tests should be adjusted to cope with this background activity,
and where not appropriate it should be noted such that the feature, when introduced, can be
disabled.
> As part of this effort I will introduce a utility class for dealing with index statistics
in tests. These will be used by some existing tests and also the new tests that will be written
for the new feature.
> At this point two tests requiring adjustments have been identified (OrderByAndSortAvoidance,
UpdateStatisticsTest), and one is under investigation (AutoIncrementTest). More may surface
as the work on the feature progress.

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