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https://issues.apache.org/jira/browse/DERBY-4409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765948#action_12765948
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Knut Anders Hatlen commented on DERBY-4409:
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+1. Looks like an improvement to me.
The calls to rollback() in the test cases are not actually needed, because (a)
auto-commit is enabled, (b) BaseJDBCTestCase.tearDown() already calls
rollback(), and (c) all the tests are read-only.
(The test originally had auto-commit disabled because setUp() called
setAutoCommit(false). Calling setAutoCommit(false) from the decorator does not
have the same effect because it uses a different Connection instance. This is
just an observation, and I'm not suggesting that we should disable auto-commit
again.)
> Make some tests run faster by using CleanDatabaseSetup + decorateSQL +
> rollback idiom
> --------------------------------------------------------------------------------------
>
> Key: DERBY-4409
> URL: https://issues.apache.org/jira/browse/DERBY-4409
> Project: Derby
> Issue Type: Improvement
> Components: Test
> Reporter: Dag H. Wanvik
> Priority: Minor
> Attachments: OrderByAndSortAvoidance-faster.diff,
> OrderByAndSortAvoidance-faster.stat
>
>
> For example, for OrderByAndSortAvoidance, this reduces running time on my box
> from ca 5 minutes to ca 1 minute, cf
> patch OrderByAndSortAvoidance-faster.
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