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https://issues.apache.org/jira/browse/DERBY-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12744785#action_12744785
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Myrna van Lunteren commented on DERBY-4213:
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I tried to replace the section in utils/CompressTable.java which looks like it 
tries to compress the Datatypes table, with a call to 
SYSCS_UTIL.SYSCS_INPLACE_COMPRESS_TABLE(.,.,.,.,.), but so far, I don't see the 
compress being called.
However, I notice that although there's code that deletes rows being call, but 
only very, very few rows actually get deleted - most of the deletes find no 
rows to delete.
At which point I don't think compress would do much anyway.

I'm take a closer look at the delete rows code.

> sttest needs to be adjusted to not run out of disk space
> --------------------------------------------------------
>
>                 Key: DERBY-4213
>                 URL: https://issues.apache.org/jira/browse/DERBY-4213
>             Project: Derby
>          Issue Type: Improvement
>          Components: Test
>    Affects Versions: 10.5.1.1, 10.6.0.0
>            Reporter: Myrna van Lunteren
>            Priority: Minor
>
> After eliminating some NullPointerExceptions for 10.5.1.1 (which I noticed 
> with 10.5.1.0 testing but had also been present with 10.4.2.0) the sttest 
> runs out of disk space before all threads are done. 
> Before, with the NPEs, the test would run its course in a day or two.
> The test should be adjusted, with perhaps more deletes, so that it will no 
> longer run out of disk space.

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