• To: "'Dong Hui Zhuo'" <dhzhuo@s...>,<xml-dev@l...>
• Subject: RE: A Question about View Construction in XML
• From: "Michael Kay" <michael.h.kay@n...>
• Date: Thu, 11 Apr 2002 16:04:03 +0100
• Importance: Normal
• In-reply-to: <Pine.SOL.4.44.0204111036100.12582-100000@s...>
• Reply-to: <michael.h.kay@n...>

> Does it mean that if the tree (the intermediate result) is
> too big to fit
> in the memory, then we have to write the tree back to
> harddisk first and
> then start running query Q2? Or in other words, can we start
> runing query Q2
> before the processing of Q1(DB) finish?

No existing XSLT processor that I know of can transform a document that is
too big to fit in memory, so writing it to disk won't help you.
>
> In relational database, since tuples are processed in
> pipeline, we can start
> running Q2 without having the complete result of Q1(DB). I am
> afraid it is
> not true in xml, right?

Xalan, I think, has the ability to start transforming, and to start
producing output, before all the input has been read. But by the time all
the input has been read, a tree will have been built in memory.

Michael Kay
Software AG
home: Michael.H.Kay@n...
work: Michael.Kay@s...

• References:
  • RE: A Question about View Construction in XML
    • From: Dong Hui Zhuo <dhzhuo@s...>

• Prev by Date: sense on XML from MS
• Next by Date: RE: sense on XML from MS
• Previous by thread: RE: A Question about View Construction in XML
• Next by thread: Re: A Query about View Construction in XML
• Index(es):
  • Date
  • Thread