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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-4833) Prepare existing JUnit tests for running with automatic index statistics generation
Date Thu, 26 May 2011 14:03:48 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4833?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kristian Waagan updated DERBY-4833:
-----------------------------------

    Issue & fix info:   (was: [Patch Available])

The initial istat related problems seen with the updatelocksX were solved by changing the
threshold values (i.e. upping the minimum number of rows required before the istat daemon
considers an update). This means patch 2a probably doesn't need to be committed.
In any case, there are still problems with the updatelocksX tests, but it is my impression
that they're not caused by the istat feature. Keeping this issue open a little while longer,
hoping we figure out what the underlying problem is.

> 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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