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From "Bryan Pendleton (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-959) Allow use of DRDA QRYDTA block sizes greater than 32K
Date Sun, 12 Feb 2006 02:39:28 GMT
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  
    Reporter: Bryan Pendleton
    Priority: Minor

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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