Cart
|
[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Which is faster: count(/Document/A/B) eq 1 ... or
 Is there an XPath expression, besides the ones listed, that is even better and faster? You want to avoid count() as then you are relying on the optimiser to rewrite it away. If you go count(B) eq 1 then unless the optimiser spots this it may try to calculate count(B) which would mean processing the full list of elements. B and not(B[2]) similarly may be read as evaluating the full list of B elements and then taking the 2nd but it is much more likely the optimiser detects [2] predicates to abort the construction of the sequence at the second item. David
________________________________________________________________________ The Numerical Algorithms Group Ltd is a company registered in England and Wales with company number 1249803. The registered office is: Wilkinson House, Jordan Hill Road, Oxford OX2 8DR, United Kingdom. This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. ________________________________________________________________________ 
|
PURCHASE STYLUS STUDIO ONLINE TODAY!Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced! 
Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|
