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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4428) Add proper delete mechanism for in-memory databases
Date Wed, 25 Nov 2009 14:13:39 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kristian Waagan updated DERBY-4428:

    Attachment: derby-4428-3b-canonical_name_handling.diff

Attached patch 3b, and committed it to trunk with revision 884105.

I chose not to rename the method argument to canonicalServiceName, as I don't think this isn't
strictly necessary. It would also mean that the argument names in the interface and the implementation
would differ (not a problem by itself, but might cause some confusion). That said, the monitor
code (and friends) is confusing on this matter - do you have to use the canonical service
name, or will the code obtain the canonical service name for you? I observe that the latter
is the case in many places, but I haven't gone through the code to confirm this is the principle
behind the code.

I need to make a few adjustments to patch 2a, and then the drop functionality will be working
- although not very well in cases where there are concurrent connection attempts to the database
being dropped.

> Add proper delete mechanism for in-memory databases
> ---------------------------------------------------
>                 Key: DERBY-4428
>                 URL: https://issues.apache.org/jira/browse/DERBY-4428
>             Project: Derby
>          Issue Type: Improvement
>          Components: JDBC, Services, Store
>    Affects Versions:
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>         Attachments: derby-4428-0a-preview_patch.diff, derby-4428-1a-in_memory_specific_delete_code.diff,
derby-4428-1a-in_memory_specific_delete_code.stat, derby-4428-1b-in_memory_specific_delete_code.diff,
derby-4428-2a-generic_db_drop.diff, derby-4428-3a-canonical_name_handling.diff, derby-4428-3b-canonical_name_handling.diff
> The current mechanism for deleting in-memory databases isn't good enough, and a proper
one must be added.
> It is also important to be able to delete in-memory databases, since they occupy valuable
main memory that should be discarded when the database is no longer needed.
> I intend to implement the mechanism by using the JDBC connection URL:
> "jdbc:derby:memory:myDatabase;delete=true[;user=X;password=Y]
> The connection attempt will throw an exception in any case, either because the request
failed or because it succeeded.
> Reasons for a failure can be invalid user and/or password, lacking encryption attributes,
or conflicting attributes.
> For the time being, only the database owner will be allowed to delete databases (*note*:
do we have a way to control/limit in-memory database creation?)

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