[jira] Updated: (DERBY-4800) Allow bulk scan of LOB tables with holdable cursors

["Kathey Marsden (JIRA)" <ji...@apache.org>]

     [ 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: 10.7.1.1
>            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.

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