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Posted to derby-dev@db.apache.org by "Kristian Waagan (JIRA)" <ji...@apache.org> on 2007/04/10 19:00:32 UTC
[jira] Updated: (DERBY-269) Provide some way to update index
cardinality statistics (e.g. reimplement update statistics)
[ https://issues.apache.org/jira/browse/DERBY-269?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kristian Waagan updated DERBY-269:
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Affects Version/s: (was: 10.0.2.2)
10.3.0.0
10.2.2.0
Added 10.2.2.0 to the affected version list, as a user has reported severe performance degradation due to this issue. See http://www.nabble.com/Performance-Tuning-Problem-tf3549175.html for details. It is likely that trunk suffers from the same issue, so I'm adding that one as well.
> 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, 10.3.0.0
> Reporter: Stan Bradbury
>
> 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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