[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: ANN: XML and Databases article
Re: ANN: XML and Databases article Ingo Macherius wrote > The other problem is you can store XML, but > have to explicitely model relations (parent, sibling, child, ... and > all other axis you need) by foreign keys. The number of "metatables" > with structural information quickly outnumbers the useful data. Again > we tried, benched and canceled. This reads like you always decomposed or mapped XML documents to store them, as opposed to storing some XML documents as a single column. The choice of how to store documents in a database will vary on a case-by-case basis, depending on application needs. The critical factor is whether you simply need a document store, or you are dealing with data that needs to be used in queries, particularly "rich" queries: (find something in XML documents and search geospatial data to retrieve the nearest location). If your XML is in a separate document store, you are faced with using data integration middleware and marshaling data. From your comments about performance, my guess is that you weren't running this type of mixed query but were focusing on simply retrieving XML. > The number of "metatables" with structural information quickly outnumbers the useful data. That's an accepted behavior in the OLAP world -- even more so now that disk and memory are inexpensive. > Currently we are investigating our PDOM, which just maps between a > W3C-DOM and persistent streams of serialized Java objects (paper will > be at OOPSLA99). Instead of modeling structure we try to scale by > means of intelligent, specialized cache strategies. That sounds like a promising solution for Java development. xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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