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ResultBufferSize DSN Parameter

Could someone clarify the effect of setting ResultBufferSize?  The docs say very little - just 

 

  "Size of memory buffer for the large result sets in streaming mode."

 

Do different ResultBufferSize settings affect the performance of fetching large result sets?  Some preliminary testing of fetching large sets of records suggests that there's no effect.  Or I'm not hitting the right code path.

 

Thanks,

 

  --Sharon

 

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