2
Copyright © 2006, Oracle. All rights reserved.
Understanding the Oracle
Data Guard Architecture
Copyright © 2006, Oracle. All rights reserved.
2 - 2
Objectives
After completing this lesson, you should be able to do the
following:
•
Describe the Data Guard architecture
•
Explain the operational requirements of Data Guard
•
Describe how Data Guard processes, transports, and
applies redo logs
•
Describe standby database modes
Copyright © 2006, Oracle. All rights reserved.
2 - 3
Data Guard Operational Requirements: Hardware
and Operating System
•
The hardware can be different for the primary and
standby databases.
•
The operating system and platform architecture for the
primary and standby databases must be the same.
•
The operating system releases for the primary and
standby databases can be different.

transactions
Online
redo
logs
ARC0
FAL
RFS
MRP or
LSP
Archived redo
logs
ARC0
Standby
database
Reports
(MRP only)
Standby
redo logs
Archived redo
logs
Backup
Oracle net
LNSn
(Real-time
apply)
Copyright © 2006, Oracle. All rights reserved.
2 - 7
Primary Database Flow
LGWR
Primary

Primary
database
transactions
Online
redo
logs
ARC0
FAL
RFS
MRP or
LSP
Archived redo
logs
ARC0
Standby
database
Oracle net
Reports
(MRP only)
Standby
redo logs
Archived redo
logs
Backup
LNSn
(Real-time
apply)
Copyright © 2006, Oracle. All rights reserved.
2 - 9
Standby Redo Logs