Oracle database architecture

create user test0 identified by p123; create user test1 identified by p123; create user test2 identified by p123; create user test3 identified by p123; create user test4 identified by p123;

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Enterprise JavaBean Là công nghệ nằm ở server-side Hỗ trợ đặc biệt cho các ứng dụng client-server: Xử lí giao tác (transaction) Mô hình dữ liệu phân tán Các ứng dụng portable Ưu điểm Phát triển và triển khaiứng dụng dựa trên công nghệ này dễ dàng. Tách biệt việc xử lý nghiệp vụ với hệ thống code.

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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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Planning and Organizing a Database Planning for your database is the first step in organizing and implementing a database system. First define how the database will be used. This determines what type of database you need to create that will meet the needs of your business, for example, data warehousing, high online transaction processing, or general purpose. After you determine the purpose and type, you must outline the database architecture that will be used.

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Overview of Primary Components The Oracle architecture includes a number of primary components, which are discussed further in this lesson. Oracle server: There are several files, processes, and memory structures in an Oracle server; however, not all of them are used when processing a SQL statement. Some are used to improve the performance of the database, to ensure that the database can be recovered in the event of a software or hardware error, or to perform other tasks necessary to maintain the database. The Oracle server consists of an Oracle instance and an Oracle database.

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Course Objectives This course is the first in a series of courses that cover the core database administrator tasks. The tasks covered in this course are: Outlining the Oracle architecture Planning and creating databases Managing the memory, process, physical, and logical structures Managing database users by controlling and monitoring their actions Using the Globalization Support features

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After completing this appendix, you should be able to do the following: Describe the Oracle Server architecture and its main components List the structures involved in connecting a user to an Oracle instance List the stages in processing: Queries DML statements Commits

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Oracle Server Configuration Options Oracle creates server processes to handle the requests of user processes connected to an instance. A server process can be either a dedicated server process, where one server process services only one user process, or it can be a shared server process, where a server process can service multiple user processes. Shared server processes are a part of Oracle Shared Server architecture.

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Two-Tier Networks In a two-tier network, a client communicates directly with a server. This is also known as a client-server architecture. A client-server network is an architecture that involves client processes that request services from server processes. The client and server communicate over a network using a given protocol, which must be installed on both the client and the server. A common error in client-server network development is to prototype an application in a small, two-tier environment and then scale up by adding more users to the server.

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Client-Server Application Connection Oracle Net enables a network connection between a client and an Oracle database server. Oracle Net is a software component that resides on both the client and on the Oracle database server. It is layered on top of the network protocol. When a connection is initiated from a client to the Oracle database server, data is passed down a stack on the client, over the network, and up a similar stack to the Oracle database server.

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Critical Database Concepts new features include “invisible” indexes, simplified table maintenance, and editioned objects. You should evaluate your previous architecture decisions in light of the new features available. In the next several chapters, you will see how to install Oracle Database 11g and how to upgrade to Oracle Database 11g from prior releases. Following those chapters, you will see an overview of application planning, followed by many chapters on the use of SQL, PL/SQL, Java, object-oriented features, and XML to get the most out of your Oracle database.

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SQL: The Complete Reference provides an in-depth discussion of SQL fundamentals, modern SQL products, and SQL's role in trends such as data warehousing, "thin-client" architectures, and Internet-based e-commerce. This book is your one-stop...

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Oracle Database Backup and Recovery Advanced User's Guide presents in-depth information on RMAN architecture, backup and recovery concepts and mechanisms, advanced recovery techniques such as point-in-time recovery and database flashback features, and backup and recovery performance tuning. It also covers user-managed backup and recovery, using host operating system facilities instead of RMAN. This volume is essential for backup and recovery of more sophisticated database deployments, and for advanced recovery scenarios....

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After completing this lesson, you should be able to do the following: Describe the factors that affect planned and unplanned downtime Describe the basic components of Oracle Data Guard Explain the differences between physical and logical standby databases Explain the benefits of creating a Data Guard environment Explain the use of Data Guard in high-availability architectures

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