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SET vs. CREATE when creating XML structure

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Maximreality

Posted: Tue May 31, 2005 2:11 am Post subject: SET vs. CREATE when creating XML structure

Acolyte

Joined: 04 Jun 2004
Posts: 65
Location: Copenhagen

CREATE LASTCHILD OF XMLref NAME 'XMLTagName' VALUE 'SomeValue';
CREATE LASTCHILD OF XMLref NAME 'AnotherXMLTagName' VALUE 'AnotherValue';

SET XMLref.XMLTagName = 'SomeValue';
SET XMLref.AnotherXMLTagName = 'AnotherValue';

Taking performance in mind, which is better? (or does it result in the same calls behind the scenes?)

I am not interested in opinions, only facts!

shalabh1976

Posted: Wed Jun 01, 2005 4:00 am Post subject:

Partisan

Joined: 18 Jul 2002
Posts: 381
Location: Gurgaon, India

I just did a performance test on a windows P4 machine using the two sets of statements in a large loop. From the usertrace I was able to get some numbers:
The Create statement is better than the SET .

I have no reasons for why it is so, but you wanted facts and here they are:
Time for the Create statements in a loop of 768 times = 0.344 sec
Time for the SET statements in a loop of 768 times = 0.3910014 sec

I am not sure if this was a correct way to check the performance nos but if someone has better ideas then please advise.
_________________
Shalabh
IBM Cert. WMB V6.0
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Bill.Matthews

Posted: Fri Jun 03, 2005 1:05 pm Post subject:

Master

Joined: 23 Sep 2003
Posts: 232
Location: IBM (Retired)

The reason Create is faster is due to the Reference Pointer - it keeps track of where you are in the messsage tree. A Set has to find the right location. The larger the tree, the larger the difference. I did some tests some time ago with a 64,000 element tree and had an even larger difference.

Cheers
_________________
Bill Matthews

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