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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-1160) Need a documented way to tell for tables and indexes: a) the number of pages allocated b) the number of empty pages
Date Wed, 02 Dec 2009 23:19:20 GMT

    [ https://issues.apache.org/jira/browse/DERBY-1160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785053#action_12785053
] 

Knut Anders Hatlen commented on DERBY-1160:
-------------------------------------------

Sounds like a good way to resolve this issue. I agree that NUMFREEPAGES and ESTIMSPACESAVING
give the information requested by the reporter.

> Need a documented way to tell for tables and indexes: a) the number of pages allocated
 b) the number of empty pages
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-1160
>                 URL: https://issues.apache.org/jira/browse/DERBY-1160
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Stan Bradbury
>
> Very active systems would benefit from a documented way to determine how many empty pages
are allocated to an index or table in order to determine whether a COMPRESS_TABLE is worth
running.

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