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https://issues.apache.org/jira/browse/DERBY-269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613665#action_12613665
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Mamta A. Satoor commented on DERBY-269:
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Knut, thanks for reviewing the patch. Answers to your questions/comments
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- since the code is copied from UpdateStatisticsConstantAction, I assume USCA
will be removed from the repository in a later patch?
Yes, I am planning on removing this file when I commit the changes.
***********************
***********************
- UpdateStatisticsConstantAction uses a strange mix of tabs and spaces for
indentation. It would be great if the indentation is cleaned up when the code
is moved.
I took care of indentation in my codeline (sorry, it is not in the patch) in
the transferred code to AlterTableConstantAction
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* - SystemProcedures.SYSCS_UPDATE_STATISTICS() uses tabs/spaces inconsistently
I took care of indentation in my codeline (sorry, it is not in the patch).
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- comment in upgradeTests/_Suite.java has the wrong version number:
+ {10, 4, 1, 3}, // 10.3.1.4 (April 24, 2008 / SVN 648739)
Thanks for catching this. I fixed the version number in my codeline.
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- SYSCS_UPDATE_STATISTICS is added to Changes10_2. Shouldn't that file only
test procedures that were added in Derby 10.2?
What I found is if I do not add SYSCS_UPDATE_STATISTICS to the list of stored
procedures in Changes10_2, I get error that there are 6 rows in SYSROUTINEPERMS
but we are looking only for 5 rows. My understanding of upgrade test is not
upto date but it sounds like we are testing the upgrade from 10.2 release to
10.5. If that is right, then I think I do need to add SYSCS_UPDATE_STATISTICS
in Changes10_2.
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> Provide some way to update index cardinality statistics (e.g. reimplement
> update statistics)
> --------------------------------------------------------------------------------------------
>
> Key: DERBY-269
> URL: https://issues.apache.org/jira/browse/DERBY-269
> Project: Derby
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.2.2.0, 10.3.1.4
> Reporter: Stan Bradbury
> Assignee: Mamta A. Satoor
> Attachments: DERBY269_update_statistics_svndiff_ver1.txt,
> DERBY269_update_statistics_svnstat_ver1.txt
>
>
> Performance problems are being reported that can be resolved by updating the
> cardinality statistics used by the optimizer. Currently the only time the
> statistics are guaranteed to be an up-to-date is when the index is first
> created on a fully populated table. This is most easily accomplished on an
> existing table by using the command:
> alter table <table-name> compress [sequential]
> Compress table is an I/O intensive task. A better way to achieve this would
> be to re-enable parser support for the 'update statistics' command or
> re-implement the update in some other fashion.
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