Beginning XML Databases (Wrox Beginning Guides) by Gavin Powell

By Gavin Powell

* Supported through all significant database structures, XML presents a simple, standardized approach to shifting info among databases and to and from the internet, self reliant of the software program in use* deals database programmers and data-driven internet builders distinct information on find out how to comprehend and paintings with XML as info* quite a few hands-on, step by step examples aid readers discover ways to simplify database paintings utilizing XML* exhibits how one can use XML to replace information among a number of databases both internally or with exterior clients and companions* Covers XML in well known databases together with Oracle Database, SQL Server, and short assurance of DB2 Database* Covers simple syntax for XML, the XML DOM, and XSL – with an emphasis on database use, and local XML databases* extra themes coated contain local XML databases, XPath, XQuery, XLink, XPointer, DTDs, XML Schemas, between others

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9 Answer the following questions: 1. What is a transaction? 2. Why does a DBMS interleave the actions of different transactions instead of executing transactions one after the other? 3. What must a user guarantee with respect to a transaction and database consistency? What should a DBMS guarantee with respect to concurrent execution of several transactions and database consistency'? 4. Explain the strict two-phase locking protocol. 5. What is the WAL property, and why is it important? 10 Use a Web browser to look at the HTML documentation for Minibase.

The data definition language. 2. The data manipulation language. 3. The buffer manager. 4. The data model. 8 Describe the structure of a DBMS. , the ability to force some sequence of bytes to disk), which layer(s) of the DBMS would you have to rewrite to take advantage of these new functions? 9 Answer the following questions: 1. What is a transaction? 2. Why does a DBMS interleave the actions of different transactions instead of executing transactions one after the other? 3. What must a user guarantee with respect to a transaction and database consistency?

A DBMS allows a user to define the data to be stored in terms of a data model. Most database management systems today are based on the relational data model, which we focus on in this book. While the data model of the DBMS hides many details, it is nonetheless closer to how the DBMS stores data than to how a user thinks about the underlying enterprise. A semantic data model is a more abstract, high-level data model that makes it easier for a user to come up with a good initial description of the data in an enterprise.

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