db-derby-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4800) Allow bulk scan of LOB tables with holdable cursors
Date Wed, 12 Jan 2011 23:11:47 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kathey Marsden updated DERBY-4800:

    Component/s: SQL

> Allow bulk scan of LOB tables with holdable cursors
> ---------------------------------------------------
>                 Key: DERBY-4800
>                 URL: https://issues.apache.org/jira/browse/DERBY-4800
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions:
>            Reporter: Knut Anders Hatlen
>            Priority: Minor
> DERBY-1511 disabled bulk scans for tables with LOBs if the cursor was holdable. This
was done to work around a bug, but it had a very negative impact on queries that scanned tables
that contained relatively small LOBs. It would be good if we could find a safe way to re-enable
bulk scans for these queries.
> The problem now is that the lob containers are closed on the transaction boundaries,
so the buffered values will be dead on arrival when we call next() after a commit(). If we
could find a way to make the containers survive across the transaction boundary, or make it
possible to reopen the container, it should be safe to re-enable the bulk scans.

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message