Xml from a database

After studying this chapter you will be able to understand: Understand what XML is and how it is used within business-to-business transactions, understand XML Schemas and XSL Transforms and how they are used within the context of XML, read and process data that is stored in an XML document, read data from a relational database and transform it into its equivalent XML, transform one XML document into a new XML document using an XSLT document.

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The 'mission statement' for the Simple-Talk Crib Sheet is: 'For the things you need to know, rather than want to know' As a developer, DBA or manager, you may not want to know all about XML, replication or Reporting Services, but if you next project uses one or more of these technologies heavily then the best place to start is from the 'jungle roof'. Crib Sheets aim to give you the broad view. Each one tackles a key area of database development, administration or deployment and provides both a management view and a technical view of that topic. Each starts...

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In this paper we describe the X-TRACT workbench, which enables efficient termbased querying against a domain-specific literature corpus. Its main aim is to aid domain specialists in locating and extracting new knowledge from scientific literature corpora. Before querying, a corpus is automatically terminologically analysed by the ATRACT system, which performs terminology recognition based on the C/NCvalue method enhanced by incorporation of term variation handling.

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We present an API developed to access GermaNet, a lexical semantic database for German represented in XML. The API provides a set of software functions for parsing and retrieving information from GermaNet. Then, we present a case study which builds upon the GermaNet API and implements an application for computing semantic relatedness according to five different metrics. The package can, again, serve as a software library to be deployed in natural language processing applications. A graphical user interface allows to interactively experiment with the system. ...

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Greg Harvey, the author of more than 50 computer books, has had a long career of teaching business people the use of IBM PC, Windows, and Macintosh software application programs. From 1983 to 1988, he conducted hands-on computer software training for corporate business users with a variety of training companies (including his own, PC Teach). From 1988 to 1992, he taught university classes in Lotus 1-2-3 and Introduction to Database Management Technology (using dBASE) in the Department of Information Systems at Golden Gate University in San Francisco.

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In traditional SAS programs, PROCS are called as part of a workflow that usually includes SAS DATA steps along with PROC steps, which invoke SAS procedures. For example, a very basic SAS program includes a DATA step that creates the SAS data set from raw data files and a PROC step that invokes an appropriate SAS procedure to process the SAS data set. A PROC invocation typically takes one or more tables as input and produces a new table as output. Various programming options and control statements can also be specified on the PROC invocation. These dictate how the PROC...

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QL For Dummies, 7th Edition, shows programmers and web developers how to use SQL to build relational databases and get valuable information from them. This book covers the core features of the SQL language. Topics covered include how to use SQL to structure a DBMS and implement a database design; secure a database; and retrieve information from a database. This edition will be revised to reflect the new enhancements of SQL/XML:2008.

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Beginning in Oracle7 with ORADBX, the ORADEBUG utility allows DBAs to start and stop tracing for any session, dump SGA and other memory structures, wakeup oracle processes such as SMON or PMON, suspend and resume processing in a SID, debug enqueue services, debug the CGS name service, dump core files and IPC information, in fact many useful operations that aren't usually available. Unfortunately this utility, other than a terse paragraph in the administrator's manuals, is virtually undocumented.

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Data Loading Methods Several methods are available for loading data into tables in an Oracle database. Of the methods available, Direct Load insert and SQL*Loader are discussed here. Export and Import are covered in the Oracle9i Database Administration Fundamentals II course. SQL*Loader SQL*Loader loads data from external files into tables of an Oracle database. It has a powerful data parsing engine that places little limitation on the format of the data in the data file. Direct Load Direct Load insert can be used to copy data from one table to another table within the same database.

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After completing this lesson, you should be able to do the following: Interpret the concept of a hierarchical query Create a tree-structured report Format hierarchical data Exclude branches from the tree structure

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After completing this lesson, you should be able to do the following: Write a multiple-column subquery Describe and explain the behavior of subqueries when null values are retrieved Write a subquery in a FROM clause Use scalar subqueries in SQL Describe the types of problems that can be solved with correlated subqueries Write correlated subqueries Update and delete rows using correlated subqueries Use the EXISTS and NOT EXISTS operators Use the WITH clause

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Oracle provides for easy and controlled privilege management through roles. Roles are named groups of related privileges that are granted to users or to other roles. They are designed to ease the administration of privileges in the database. Role characteristics Roles can be granted to and revoked from users with the same commands that are used to grant and revoke system privileges. Roles can be granted to any user or role. However, a role cannot be granted to itself and cannot be granted circularly. A role can consist of both system and object privileges.

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Managing Privileges A privilege is a right to execute a particular type of SQL statement or to access another user’s object. These include the right to: Connect to a database Create a table Select rows from another user’s table Execute another user’s stored procedure System privileges Each system privilege allows a user to perform a particular database operation or class of database operations; for example, the privilege to create tablespaces is a system privilege.

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Classification of Indexes An index is a tree structure that allows direct access to a row in a table. Indexes can be classified based on their logical design or on their physical implementation. The logical classification groups indexes from an application perspective, while the physical classification is derived from the way the indexes are stored. Single column and concatenated indexes A single column index has only one column in the index key—for example, an index on the employees number column of an employees table.

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Defined by SHARED_POOL_SIZE Library cache contains statement text, parsed code, and execution plan. Data dictionary cache contains definitions for tables, columns, and privileges from the data dictionary tables. UGA contains session information for Oracle Shared Server users when a large pool is not configured.

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After completing this lesson, you should be able to do the following: Write SELECT statements to access data from more than one table using equality and nonequality joins View data that generally does not meet a join condition by using outer joins Join a table to itself by using a self join

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Allocation of a Rollback Segment When a transaction begins, a rollback segment must be assigned to this transaction. A transaction can request a specific rollback segment using the following command: SET TRANSACTION USE ROLLBACK SEGMENT rollback_segment If no such request is made, the Oracle server chooses the rollback segment with the fewest transactions and assigns it to the transaction. Using Extents Transactions use extents of a rollback segment in a sequential, circular fashion, moving from one to the next after the current extent is full.

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Export and Import Utilities The Export utility provides a simple way for you to transfer data objects between Oracle databases, even if they reside on platforms with different hardware and software configurations. When you run Export against an Oracle database, objects (such as tables) are extracted, followed by their related objects (such as indexes, comments, and grants), if any. The extracted data is written to an Export file, which is an Oracle binary-format dump file that is typically located on disk or tape.

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Overview The recovery catalog is a schema that is created in a separate database. It contains the RMAN metadata obtained from the target database control file. RMAN propagates information about the database structure, archived redo logs, backup sets, and datafile copies into the recovery catalog from the control file of the target database. You should use a catalog when you have multiple target databases to manage. RMAN stores, uses, and maintains the information in the recovery catalog. The recovery catalog is maintained by RMAN when you do the following: 1.

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Workshop Methodology Group-Oriented and Interactive Structure The workshop is structured to allow individuals to work in groups to perform database backup, restore, and recovery operations. Each group is encouraged to share its approach to resolving database failures with other groups in the class. Intensive Hands-On Diagnosis and Problem Resolution The intent is to provide you with as much hands-on experience as possible to diagnose and work through backup and recovery scenarios.

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