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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-3906) SQL roles: add caching of the role grant graph for performance
Date Sun, 30 Sep 2012 02:32:07 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mamta A. Satoor updated DERBY-3906:
-----------------------------------

    Urgency: Normal
     Labels: derby_triage10_10  (was: )
    
> SQL roles: add caching of the role grant  graph for performance
> ---------------------------------------------------------------
>
>                 Key: DERBY-3906
>                 URL: https://issues.apache.org/jira/browse/DERBY-3906
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Dag H. Wanvik
>            Priority: Minor
>              Labels: derby_triage10_10
>
> In the first implementation, the graph of the grant role relation is built as needed.
> For DDL statements this is acceptable, but less less so for the following case:
> When a session changes it's role from a non-null role ("old role"), any activations
> of prepared statements that relied on a role in "old role"s grant closure will need re-checking.
> So, computing this, requires the grant graph. Setting a role is a more frequent operations,
> e.g. in a stored routine, so re-building the grant graph each time is (too) expensive.

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