Database systems and oracle

After completing this lesson, you should be able to do the following: Describe different system architectures Describe the primary steps of OS tuning Identify similarities between OS and DB tuning Understand virtual memory and paging Explain the difference between a process and a thread

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Users and Security Security domain The database administrator defines the names of the users who are allowed to access a database. A security domain defines the settings that apply to the user. Authentication mechanism A user who requires access to the database can be authenticated by one of the following: Data dictionary Operating system Network The means of authentication is specified at the time the user is defined in the database and can be altered later. This lesson covers authentication by database and by operating system only.

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Built-In Database Objects In addition to creating the database files, several other structures are created. Data dictionary: Contains descriptions of the objects in the database Dynamic performance tables: Contains information used by the database administrator (DBA) to monitor and tune the database and instance PL/SQL packages: Program units adding functionality to the database. These packages are created when the catproc.sql script is run after the CREATE DATABASE command. PL/SQL packages will not be discussed within the scope of this course.

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Before a database is created, the UNIX environment must be configured and the Oracle9i server must have already been installed. Four environment variables must be set: ORACLE_HOME, ORACLE_SID, PATH, LD_LIBRARY_PATH. ORACLE_HOME is the full path to the top directory in which the Oracle9i Server is installed. The directory for ORACLE_HOME should be supplied by the person who installed the server, usually the UNIX administrator or the DBA. ORACLE_SID is a user-definable name assigned to an instance of a database.

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Database Systems: The Complete Book- P13: Database Systems and Database Design and Application courses offered at the junior, senior and graduate levels in Computer Science departments. Written by well-known computer scientists, this introduction to database systems offers a comprehensive approach, focusing on database design, database use, and implementation of database applications and database management systems

19p baby246 18-08-2010 81 6   Download

Database Systems: The Complete Book- P12: Database Systems and Database Design and Application courses offered at the junior, senior and graduate levels in Computer Science departments. Written by well-known computer scientists, this introduction to database systems offers a comprehensive approach, focusing on database design, database use, and implementation of database applications and database management systems

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Using Password File Authentication This section describes how to authenticate an administrative user using password file authentication.

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Database you say—now there's a word you hear all the time! In a nutshell, a database is an electronic collection of information designed to meet a handful of needs:  Databases provide one-stop shopping for all your data storage requirements. The database contains any amount of data, from the small to the huge.  Databases must provide mechanisms to retrieve data quickly as applications interact with their contents.  Databases allow the sharing of corporate data such that personnel data is shared amongst one's payroll, benefits, and pension systems....

6p saviour 24-02-2010 165 26   Download

Oracle Server Technologies and the Relational Paradigm The relational paradigm is highly efficient in many respects for many types of data, but it is not appropriate for all applications. As a general rule, a relational analysis should be the first approach taken when modeling a system. Only if it proves inappropriate should one resort to nonrelational structures. Applications where the relational model has proven highly effective include virtually all Online Transaction Processing (OLTP) systems and Decision Support Systems (DSS).

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CRITICAL SKILL 1.1: Define a Database Database you say—now there's a word you hear all the time! In a nutshell, a database is an electronic collection of information designed to meet a handful of needs:
 Databases provide one-stop shopping for all your data storage requirements. The database contains any amount of data, from the small to the huge.
 Databases must provide mechanisms to retrieve data quickly as applications interact with their contents.

6p saviour 08-12-2009 150 38   Download