data guard 10 g new features

8/13/2019 Data Guard 10 g New Features

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Oracle Data Guard 10g Objectives

Establish Data Guard as an extremely

easy-to-use

low-cost

comprehensive

Disaster Recovery solution for

enterprise data


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Overview of Objectives

Ease of usesimplified SQL, easy to create,

manage and administer standby databases,

simplified GUI focused on best practices

Low costbusinesses can leverage existing

resources to implement Data Guard, zero

integration costs

Comprehensivefeature-rich and flexible


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Data Guard 10g New Features

General new features Real Time Apply

Flashback Database Integration

SQL Apply new features

Zero Downtime Instantiation

Rolling Upgrades

Additional Datatypes

Data Guard Broker & Enterprise Manager new features

RAC integration

Simplified browser-based interface focused on best practices


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Real Time Apply

Redo data is applied to the standby database as soon as it isreceived from the primary database

In Oracle9iData Guard this apply has to wait till an archivelog iscreated on the standby database

For Redo Apply:ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USINGCURRENT LOGFILE

For SQL Apply:ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE

When real time apply is enabled, RECOVERY_MODEcolumn inV$ARCHIVE_DEST_STATUSdisplays MANAGED REAL TIMEAPPLY


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An up-to-date

Physical/Logical

StandbyDatabase

MRP/ LSPRFS

StandbyRedo

Logs

ARCH

Real Time Apply Architecture

Archived

Redo Logs

Archived

Redo Logs

Primary

Database

Transactions

LGWR

Online

Redo

Logs

ARCH

Oracle Net

Real Time

Apply


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Real Time Apply Benefits

Standby databases now more closely

synchronized with the primary

More up-to-date, real-time reporting

Faster switchover and failover times

Reduces planned and unplanned downtime

Better Recovery Time Objective (RTO) for DR


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Existing Site Recovery Tradeoffs

Log apply may be delayed to protect from user errors but:

Switchover/Failover gets delayed Reports run on old data

After failing over to standby, production DB must be rebuilt

Primary Database Standby Database

RedoShipment

Delayed

Apply

Reporting on

delayed data


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Flashback Database

A new strategy for point in time recovery Eliminate the need to restore a whole

database backup

Integrated seamlessly with RMAN

Think of it as a continuous backup

Restores just changedblocks

Its fast- recover in minutes, not hours

Its easy- single command restore

RMAN> FLASHBACK DATABASETIMESTAMP to_timestamp

('2003-08-15 16:00:00',

'YYYY-MM-DD HH24:MI:SS');


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Enhanced DR with Flashback Database

Flashback DB removes the need to delay application of logs

Flashback DB removes the need to reinstantiate primary after failover

Real-time apply enables real-time reporting on standby

Real Time

Apply

No Delay!

Real Time

Repor t ing

Flashback

LogFlashback

Log

Primary: No reinstant iat ion

after fai lover!

RedoShipment

Primary Database Standby Database


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SQL Apply: Zero Downtime Instantiation

Logical standby database can now be created

from an online backup of the primary database,

without shutting down or quiescing the primary

database No shutdown implies no downtime of production

system

No quiesce implies no wait on quiesce and no

dependence on Resource Manager


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Rolling Upgrades

Major

Release

Upgrades

Patch SetUpgrades

Cluster

Software &

HardwareUpgrades

Initial SQL Apply Config

ClientsRedo

Version X Version X

1

BA

Switchover to B, upgrade A

Redo

4

Upgrade

X+1X+1

BA

Run in mixed mode to test

Redo

3

X+1X

A B

Upgrade node B to X+1

Upgrade

Logs

Queue

X

2

X+1

A B


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SQL Apply: Additional Data Types

SQL Apply now supports the following additional data types:

Multi-byte CLOB

NCLOB

LONG

LONG RAW

BINARY_FLOAT

BINARY_DOUBLE

IOT-s (without overflows and without LOB columns)

Allows logical standby databases to recover and protect a widervariety of data, thus increasing the overall database protection and

recovery options for Data Guard


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Enterprise Manager New Features

Streamlined browser-based interface that

enables complete standby database lifecycle

management

Focus on:

Ease of use

Management based on best practices

Pre-built integration with other HA features


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RAC Support Broker

Now possible to use the Broker to create and manage

configurations that contain RAC primary and RAC

standby databases

Data Guard Broker interfaces with Oracle Clusterwaresuch that it has control over critical operations during

specific Data Guard state transitions

Switchovers, failovers, protection mode changes, state

changes


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RAC Primary

Two standby dbs


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Instance specific


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Example Ease of Use

Switchover using Enterprise Manager is now

literally two mouse clicks


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Switched!


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data guard 10 g new features

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