Re[2]: [bdbxml] Suggestion: XmlIndexLookup to return the number of referred keys

Hello George,

Monday, April 17, 2006, 11:20:08 AM, you wrote:

> Thanks for the idea.  What you are asking is pretty much available.
> One way is to do what you are saying:
> 1.  Use XmlIndexLookup() using LAZY_EVALUATION and DBXML_LAZY_DOCS
> 2.  iterate the results, counting.  Lazy evaluation never creates a  
> large
> result set.

> Granted, the overhead of creating XmlValue objects exists, as does
> walking the index, but that's the most reliable way to get the  
> information.
Yes, I wanted precisely to avoid that iteration overhead - in a large
resultset, it could be very wasteful.

> There does exist the interface, XmlContainer::lookupStatistics(), which
> returns an object that has information about the index passed.
> One piece of information is the number of entries in the index.
> So, you could use that interface as well, if you'd find it useful.
That seems to be it, although it is a bit hidden and I could not find it
on the first sight :). Too bad it won't work with the XmlIndexLookup
object, and I will have to pass the index specification to the
XmlContainer. Is tehre a fast way to retrieve that information only by
using only the XmlIndexLookup object ?

Thanks, George.
-- 
Best regards,
 Steve                            mailto:[email protected]



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