1 Oracle Data Guard: Overview

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1 Oracle Data Guard: Overview

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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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Nội dung Text: 1 Oracle Data Guard: Overview

Objectives 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 1-2 Copyright © 2006, Oracle. All rights reserved.
Causes of Data Loss Hardware & system errors 49% Human errors 36% Computer viruses 7% Software corruption 4% Natural disasters 3% Source: Disaster Recovery Journal 1-3 Copyright © 2006, Oracle. All rights reserved.
Understanding the Causes of Downtime Storage failure Computer failures Unplanned Human downtime error Data failures Corruption Data Site changes failure Planned downtime System changes 1-4 Copyright © 2006, Oracle. All rights reserved.
Types of Standby Databases There are two types of standby databases: • Physical standby database – Identical to the primary database on a block-for-block basis – Synchronized with the primary database through application of redo data received from the primary database • Logical standby database – Shares the same schema definition – Synchronized with the primary database by transforming the data in the redo received from the primary database into SQL statements and then executing the SQL statements 1-6 Copyright © 2006, Oracle. All rights reserved.
Oracle Data Guard Broker Framework Oracle Management Server Repository Agent Agent Primary Standby database database Data Data Guard Guard broker Enterprise Manager broker CLI management client 1-7 Copyright © 2006, Oracle. All rights reserved.
Types of Services There are three types of services provided with Data Guard: • Redo transport services • Log apply services – Redo Apply – SQL Apply • Role-management services 1-8 Copyright © 2006, Oracle. All rights reserved.
Role Transitions: Switchover and Failover • Oracle Data Guard supports two role-transition operations: – Switchover — Planned role reversal — Used for OS or hardware maintenance – Failover — Unplanned role reversal — Use in emergency — Zero or minimal data loss depending on choice of data protection mode — Can be initiated automatically when fast-start failover is enabled • Role-transition operations are not automatically invoked. 1-9 Copyright © 2006, Oracle. All rights reserved.
Benefits of Implementing Oracle Data Guard Oracle Data Guard provides the following benefits: • Continuous service through disasters or crippling data failures • Complete data protection against corruptions and data loss • Efficient use of system resources • Elimination of idle standby systems • Flexible configuration of your system to meet business protection and recovery requirements • Centralized management 1 - 13 Copyright © 2006, Oracle. All rights reserved.
Role of Data Guard in a High-Availability Architecture Computer RAC failures Storage failure ASM Human Flashback error technology Data failures Oracle HARD Corruption RMAN Site Data Guard failure 1 - 14 Copyright © 2006, Oracle. All rights reserved.
Role of Data Guard in a High-Availability Architecture • Online schema and data reorganization Data • Partitioned tables changes and indexes • Dynamic resource provisioning Planned downtime • Rolling patch updates System • Rolling release upgrade changes using Data Guard SQL Apply 1 - 15 Copyright © 2006, Oracle. All rights reserved.
Oracle Data Guard and Real Application Clusters Oracle Data Guard and Real Application Clusters are complementary and can be used together. • Real Application Clusters provides high availability. • Oracle Data Guard provides disaster protection and prevents data loss. 1 - 16 Copyright © 2006, Oracle. All rights reserved.
Maximum Availability Architecture Clients Oracle WAN traffic Oracle Application manager Application Server Server Data Guard RAC RAC RAC production physical logical database standby standby database database 1 - 17 Copyright © 2006, Oracle. All rights reserved.
Summary In this lesson, you should have learned how to: • Describe the basic components of Oracle Data Guard • Describe the differences between physical and logical standby databases • Determine when Oracle Data Guard is an appropriate solution in your Oracle Database configuration • Explain the use of Data Guard in high-availability architectures 1 - 18 Copyright © 2006, Oracle. All rights reserved.
Practice 1: Overview This practice covers the following topics: • Reviewing the factors that affect planned and unplanned downtime • Reviewing the differences between physical and logical standby databases • Reviewing the components of Oracle Data Guard 1 - 19 Copyright © 2006, Oracle. All rights reserved.

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