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Arquitectura Oracle

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Objectives

After completing this lesson, you should be able to do

the following:

Describe the Oracle database architecture

Understand the instance architecture Use the management framework

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Database Architecture

Data files Online redo log files

Password fileParameter file Archive log files

Control files

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Exploring the Storage Structure

Click on the links to viewdetailed information

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Control Files

Contain physical database structure information

Multiplexed to protect against loss

Required to start the instance

Control files

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Redo Log Files

Record changes to the database

Multiplex to protect against loss

Redo log

buffer

Log

writer

LGWR

Group 1 Group 2 Group 3

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Tablespaces and Datafiles

Tablespaces consist of one or more data files

Data files belong to only one tablespace

USERS Tablespace

Data file 1 Data file 2

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Segments, Extents, and Blocks

Segments exist within a tablespace.

Segments are made of a collection of extents.

Extents are a collection of data blocks.

Data blocks are mapped to OS blocks.

Segment Extents Datablocks

OS blocks

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Oracle Instance Management

System

Monitor

SMON

Database

Writer

DBW0

Log

Writer

LGWR

Process

Monitor

PMON

Archiver

ARC0

SGA

Java Pool

Shared Pool Large PoolStreams Pool

Database

Buffer Cache

Redo Log

Buffer

Check

point

CKPT

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Oracle Memory Structures

Java PoolDatabase

Buffer CacheRedo Log

Buffer

Shared Pool Large Pool

SGA

Streams Pool

Server

Process

1

PGA

Server

Process

2

PGA

Back-

ground

Process

PGA

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Oracle Processes

System

Monitor

SMON

Database

Writer

DBWn

Check

point

CKPT

Log

Writer

LGWR

Process

Monitor

PMON

Archiver

ARCn

Server

Process

Server

Process

Server

Process

Server

Process

System Global AreaSGA

Background Processes

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Data Dictionary

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Database Control

Database

control

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Grid Control

Gridcontrol

Management

server

Management

repository

Database

controlDatabase

OS/third-party

application

Application

server

Application

server control

Managed

targets

Agent AgentAgent

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Summary

In this lesson, you should have learned how to:

Describe the Oracle database architecture

Understand the instance architecture

Use the management framework