June 2001
Intermediate to advanced
384 pages
11h 36m
English
book
Oracle Essentials: Oracle9i, Oracle8i and Oracle8, Second Edition
by Rick Greenwald, Robert Stackowiak, Jonathan Stern
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The Metadata Challenge
On the one hand, metadata—or data that describes data—is incredibly important. Virtually all types of interactions with a database require the use of metadata, from knowing the datatypes of the data to understanding the business meaning and history of data fields.
On the other hand, metadata is useful only if the tools and clients who wish to use it can leverage it. One of the great challenges is to create a set of common metadata definitions that allows tools and databases from different vendors to interact.
There have been a number of attempts to reach an agreement on common metadata definitions. In 2000, a standard was ratified that defines a common interface for interchange of metadata implementations. Named the Common Warehouse Metadata Interchange (CWMI) by the Object Management Group (OMG), this standard is based on XML interchange. Oracle, one of the early proponents and developers of the technology in this standard, has already released CWMI bridges for exchanging metadata in its own products. Examples include Oracle bridges provided to exchange metadata from the Oracle Warehouse Builder repository to Oracle Discoverer and Oracle Express. OWB3i also includes a metadata viewer for viewing data lineage and impact analysis within the repository; the viewer is planned to be extended through CWMI to view other repositories in the future.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.