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From "Sunitha Kambhampati (JIRA)" <derby-...@db.apache.org>
Subject [jira] Resolved: (DERBY-959) Allow use of DRDA QRYDTA block sizes greater than 32K
Date Wed, 05 Jul 2006 21:38:31 GMT
     [ http://issues.apache.org/jira/browse/DERBY-959?page=all ]
Sunitha Kambhampati resolved DERBY-959:

    Resolution: Fixed

This fix has been code for sometime. I have verified this fix with the odbc client driver.

> Allow use of DRDA QRYDTA block sizes greater than 32K
> -----------------------------------------------------
>          Key: DERBY-959
>          URL: http://issues.apache.org/jira/browse/DERBY-959
>      Project: Derby
>         Type: Improvement

>   Components: Network Client, Performance, Network Server
>     Versions:,,,
>     Reporter: Bryan Pendleton
>     Assignee: Sunitha Kambhampati
>     Priority: Minor
>      Fix For:
>  Attachments: 959Notes_v1.html, SmallRows_32kBlkSz.trace, SmallRows_64kBlkSz.trace, derby959.review.diff.txt,
derby959.review.stat.txt, odbc_rowgreaterthan64k.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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