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Date: Mon, 24 Mar 2008 01:29:24 -0700 (PDT)
From: "Anurag Shekhar (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Closed: (DERBY-3502) Unique Constraint's backing index when
 shared with existing indexes doesn't behave as expected
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     [ https://issues.apache.org/jira/browse/DERBY-3502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Anurag Shekhar closed DERBY-3502.
---------------------------------


> Unique Constraint's backing index when shared with existing indexes doesn't behave as expected
> ----------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3502
>                 URL: https://issues.apache.org/jira/browse/DERBY-3502
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.4.0.0
>            Reporter: Anurag Shekhar
>            Assignee: Anurag Shekhar
>            Priority: Critical
>             Fix For: 10.4.0.0
>
>         Attachments: d3502v3_modified_1.diff, derby-3502v1.diff, derby-3502v2.diff, derby-3502v3.diff
>
>
> Unique Constraint now uses non unique backing indexes with new attribute UniqueWithDuplicateNulls. This index has following sharing properties
> 1. Can use an existing unique index.
> 2. Non Unique indexes (and foreign key) can use this index.
> While dropping a unique index a new index for unique constraint should be created.
> when a unique constraint is dropped a new index for a non unique index or foreign key should be created. 
> Army has found several issues in actual behavior. This problems are listed in DERBY-3456.

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