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From Øystein Grøvlen (JIRA) <j...@apache.org>
Subject [jira] Commented: (DERBY-3354) Select from large lob table with embedded gives OutOfMemoryError
Date Thu, 03 Apr 2008 11:18:24 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585049#action_12585049
] 

Øystein Grøvlen commented on DERBY-3354:
----------------------------------------

I do think that it is a good idea to put disk operations in a finalizer, but it should be
possible to record work that needs to be done (e.g., at transaction commit).   I do not think
delaying clean-up of files until db reboot is acceptable since a server may be running for
months without a reboot.



> Select from large lob table with embedded gives OutOfMemoryError
> ----------------------------------------------------------------
>
>                 Key: DERBY-3354
>                 URL: https://issues.apache.org/jira/browse/DERBY-3354
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.3.1.4, 10.3.2.1, 10.4.0.0
>            Reporter: Kathey Marsden
>            Assignee: Anurag Shekhar
>         Attachments: derby-3354.diff, derby-3354_preview.diff, LocLeak.java
>
>
> Retrieving from a large table with lobs gives an OutOfMemoryException, even if free()
is explictly called on the lob.   I believe this is because EmbedConnection.addLobMapping
is called for every lob creation but is never cleared until commit or rollback, even if the
lob is freed.

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