query xml

• sam-433147

  Ten Centuries

  Points: 1221

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  May 26, 2013 at 9:27 am

  #394848

  i have a large xml file

  one of my queries looks like:

  SELECT

  p.value('(PodactID)[1]', 'nvarchar(max)'),

  q.value('(CustomerID)[1]', 'nvarchar(max)'),

  r.value('(IsPaid)[1]', 'int'),

  r.value('(Payment)[1]', 'real'),

  r.value('(PaymentDate)[1]', 'nvarchar(max)')

  FROM XmlTable CROSS APPLY XML_DATA.nodes('Customers/Customer/Podact/PodactBills/PodactsBill') t(p)

  CROSS APPLY p.nodes('Payments/PaymentDetails[CustomerID]') a(q)

  CROSS APPLY r.nodes('PaymentsDetails[IsPaid]') b(r)

  how can i improve the query duration, because it takes lot of time?

  thanks

• Eugene Elutin

  SSC Guru

  Points: 59322

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  May 28, 2013 at 10:31 am

  #1619055

  Process large xml in chunks.

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• sam-433147

  Ten Centuries

  Points: 1221

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  May 28, 2013 at 1:05 pm

  #1619097

  any idea how to divide the xml to chunks?

• mister.magoo

  SSC-Forever

  Points: 47174

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  May 28, 2013 at 4:25 pm

  #1619139

  Do you really need your PodactID, CustomerID and PaymentDate to be nvarchar(MAX) data types? I doubt it - use the correct data type for these.

  When you query an element value, do it like this : '(mynode/text())[1]', not this '(mynode)[1]'

  What is going on with those cross apply clauses ? r.nodes is invalid here as the only "r" declared is the result of the r.nodes clause!!

  How many rows are in your table? How big is each XML_DATA value? Do you have suitable indexes and a WHERE clause?

  MM
  

  ---

  
  select geometry::STGeomFromWKB(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