dg-adg-technical-overview-wp-5347548.pdf

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2024-01-05

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Oracle (Active)

Data Guard 19c

Real-Time Data Protection and Availability

WHITE PAPER / MARCH 7, 2019

TABLE OF CONTENTS

Introduction ................................ ..................................................................3

Oracle Active Data Guard – An Overview....................................................4

Data Guard 19c New Features ....................................................................5

How Data Guard Synchronizes Standby Database(s) .................................8

Protection Modes ................................ ....................................................... 11

Managing a Data Guard Configuration ......................................................11

Using Data Guard to reduce Planned Downtime .......................................13

Active Data Guard......................................................................................14

Conclusion .................................................................................................18

Appendix A: Summary of (Active) Data Guard Features by Version .........19

Appendix B: Transient Logical Database Rolling Upgrade ........................22

WHITE PAPER / Oracle (Active)

Data Guard 19c

INTRODUCTION

Successful high availability (HA) architectures prevent downtime and data

loss by using redundant systems and software to eliminate single points of

failure. The same principle applies to mission critical databases.

Administrator error, data corruption caused by system or software faults, or

complete site failures can affect the availability of a database. Even a

clustered database running on multiple servers using shared storage can

be exposed to single points of failure if not adequately protected.

The only way to prevent being impacted by single points of failure is to

have a completely independent copy of a production database already

running on a different system and ideally deployed at a second location,

which can be quickly accessed if the production database becomes

unavailable for any reason.

Oracle Active Data Guard is the most comprehensive solution available to

eliminate single points of failure for mission critical Oracle Databases. It

prevents data loss and downtime in the simplest and most economical

manner by maintaining a synchronized physical replica of a production

database at a remote location. If the production database is unavailable for

any reason, client connections can quickly, and in some configurations

transparently, failover to the synchronized replica to restore service. Active

Data Guard eliminates the high cost of idle redundancy by allowing

reporting applications, ad-hoc queries, and data extracts to be offloaded to

read-only copies of the production database. Active Data Guard’s deep

integration with Oracle Database and complete focus on real-time data

protection and availability avoids compromises found in storage remote

mirroring or other host-based replication solutions.

This paper describes both Active Data Guard (a licensed option) and Data

Guard (included in Oracle Database Enterprise Edition) in detail and is

tailored to IT managers, Database Administrators and technical staff, who

are evaluating different alternatives to protect against data loss and

database downtime.

WHITE PAPER / Oracle (Active)

Data Guard 19c

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