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From "Knut Anders Hatlen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-822) Client driver: Pre-fetch data on executeQuery()
Date Tue, 21 Feb 2006 13:43:59 GMT
    [ http://issues.apache.org/jira/browse/DERBY-822?page=comments#action_12367192 ] 

Knut Anders Hatlen commented on DERBY-822:
------------------------------------------

Created a sub-task (DERBY-1014) to make most of the test changes independent of the code changes
in my previously attached patch (DERBY-822-v1.diff). Will attach a new (and smaller) patch
to this issue later.

> Client driver: Pre-fetch data on executeQuery()
> -----------------------------------------------
>
>          Key: DERBY-822
>          URL: http://issues.apache.org/jira/browse/DERBY-822
>      Project: Derby
>         Type: Improvement
>   Components: Network Client, Network Server, Performance
>     Versions: 10.2.0.0
>     Reporter: Knut Anders Hatlen
>     Assignee: Knut Anders Hatlen
>     Priority: Minor
>      Fix For: 10.2.0.0
>  Attachments: DERBY-822-v1.diff, DERBY-822-v1.stat
>
> Currently, the client driver does not pre-fetch data when
> executeQuery() is called, but it does on the first call to
> ResultSet.next(). Pre-fetching data on executeQuery() would reduce
> network traffic and improve performance.
> The DRDA protocol supports this. From the description of OPNQRY (open
> query):
>   The qryrowset parameter specifies whether a rowset of rows is to be
>   returned with the command.  This is only honored for non-dynamic
>   scrollable cursors (QRYATTSNS not equal to QRYSNSDYN) and for
>   non-scrollable cursors conforming to the limited block query
>   protocol.  The target server fetches no more than the requested
>   number of rows. It may fetch fewer rows if it is restricted by extra
>   query block limits, or if a fetch operation results in a negative
>   SQLSTATE or an SQLSTATE of 02000.

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