query xml

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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
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Eugene Elutin SSC Guru Points: 59322 More actions · Answer 1

Process large xml in chunks.

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sam-433147 Ten Centuries Points: 1221 More actions · Answer 2

sam-433147

Ten Centuries

Points: 1221

May 28, 2013 at 1:05 pm

#1619097

any idea how to divide the xml to chunks?

mister.magoo SSC-Forever Points: 47068 More actions · Answer 3

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

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