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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-959) Allow use of DRDA QRYDTA block sizes greater than 32K
Date Mon, 29 Jun 2009 14:37:47 GMT

     [ https://issues.apache.org/jira/browse/DERBY-959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Dag H. Wanvik updated DERBY-959:

    Derby Categories: [Performance]

> Allow use of DRDA QRYDTA block sizes greater than 32K
> -----------------------------------------------------
>                 Key: DERBY-959
>                 URL: https://issues.apache.org/jira/browse/DERBY-959
>             Project: Derby
>          Issue Type: Improvement
>          Components: Network Client, Network Server
>    Affects Versions:,,
>            Reporter: Bryan Pendleton
>            Assignee: Sunitha Kambhampati
>            Priority: Minor
>             Fix For:
>         Attachments: 959Notes_v1.html, derby959.review.diff.txt, derby959.review.stat.txt,
odbc_rowgreaterthan64k.trace, SmallRows_32kBlkSz.trace, SmallRows_64kBlkSz.trace
> Currently, the Network Server and Network Client use a 32K blocksize when
> returning database data in QRYDTA blocks.
> I came across the following statement in the DRDA spec (Volume 1, page 12):
>     Blocking applies only to the QRYDTA reply objects. Each
>     query block is a QRYDTA DSS. The maximum query block size
>     value allowed in the qryblksz parameter is increased from
>     32K to 10M, thus accomodating the larger data volumes
>     required by modern, more data-intensive applications.
> The importance of larger block sizes depends strong on the application
> profile.. For example, many applications perform single-record selects, 
> and they are not influenced by the block size.
> But for some applications, it seems like the ability to use a larger block
> size could be quite valuable.

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