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Lesson 1

Introduction to Database Creation and Architecture

Welcome to Database Creation and Architecture.

Standalone XQuery Virtual Machine

The full capabilities of the Oracle XQuery Virtual Machine can be accessed using a standalone application. This allows XQuery expressions to be performed directly from the command line without interacting with Oracle Database. It also enhances the Oracle XQuery Virtual Machine to add support for the XQuery Update standard as well as the emerging XQuery scripting language. The Oracle XQuery Virtual Machine and database can also share the same native XML format, allowing the Oracle XQuery Virtual Machine to process XML from the database without having to incur the overhead of serializing and parsing the XML in question. The Oracle XQuery Virtual Machine is a powerful XQuery processor currently only available as part of Oracle Database. Enabling a standalone command-line mode allows the Oracle XQuery Virtual Machine to be used to execute XQuery operations in situations when running XQuery inside the database is not appropriate

Course goals

The first part of this series focuses on architecture, database creation, and the basics of interacting with an Oracle database. After you complete this course, you will be able to:
  1. Create a new database
  2. Find the files in a database, and identify their purpose
  3. Identify the processes that operate on a database
  4. Understand the significant memory structures of a database instance
  5. Start up and shut down a database


Tables

A table is the basic unit of storage in an Oracle database. Without any tables, a database has no value to an enterprise. Regardless of the type of table, data in a table is stored in rows and columns, similar to how data is stored in a spreadsheet. But that is where the similarity ends. The robustness of a database table due to the surrounding reliability, integrity, and scalability of the Oracle database makes a spreadsheet a poor second choice when deciding on a place to store critical information.
In this section, we will review the many different types of tables in the Oracle database and how they can satisfy most every data-storage need for an organization.

Relational Tables

A relational table is the most common type of table in a database. A relational table is heaporganized; in other words, the rows in the table are stored in no particular order. In the CREATE TABLE command, you can specify the clause ORGANIZATION HEAP to define a heap-organized table, but because this is the default, the clause can be omitted.
Each row of a table contains one or more columns; each column has a datatype and a length. As of Oracle version 8, a column may also contain a user-defined object type, a nested table, or a VARRAY. In addition, a table can be defined as an object table. We will review object tables and objects later in this section.

Oracle certification

This course, taken in conjunction with the next four courses in the Oracle Database Administration Certification Series, will prepare you for the following Oracle certification exam:
  1. 1Z0-052 , Oracle11g: Database Administration
    Oracle Database 11g: Administration I
This database administration exam is one of five that you must pass in order to earn certification as an Oracle database administrator.