Proven Techniques for Maximizing AvailabilityMaximum Availability Architecture

Lawrence To, Shari Yamaguchi

High Availability Systems Group Systems Technologies

Oracle Corporation

Session id: 40180

Agenda

Achieving High Availability Maximum Availability Architecture (MAA) Solutions to Real World Questions Real MAA Deployments MAA in 10g Future MAA Q & A

Achieving High Availability

Prevent outages before they occur. Tolerate outages - planned or unplanned so

they are transparent to the business. Recover quickly if an outage does occur.

Causes of Downtime

Computer Computer FailuresFailures

Data Data FailuresFailures

System System ChangesChanges

Data Data ChangesChanges

UnplannedUnplannedDowntimeDowntime

PlannedPlannedDowntimeDowntime

Human Error, Human Error, Corruption, Corruption, Storage Failure, Storage Failure, Site FailureSite Failure

System Maintenance,System Maintenance,Software Maintenance,Software Maintenance,Application ChangesApplication Changes

High Availability is …

Maximum Availability Architecture Best Oracle High Availability Architecture Best Practices

Building the configuration. Managing the configuration. Recovering from outages quickly. Restoring full fault tolerance.

Continual Testing Evolves with new Oracle versions and

features

Maximum Availability Architecture

What to Use:– High Availability Blueprint for Database, Oracle.

Application Server, Enterprise Manager, and more.

How to Build, Manage, and Recover:– Following configuration and operational best

practices.– Understanding outages and detailed recovery

solutions.– Restoring fault tolerance after an outage.

Unbreakable Architecture + Best Practices = Maximum Availability

Maximum Availability Architecture

WAN Traffic Manager

Dedicated Network

Primary Site

RAC

Oracle Application Server

Secondary Site

Oracle Application Server

RACData Guard

MAA Was Created Based on…

Real world customer requests and questions:

– What issues should we consider for choosing the most optimal high availability architecture?

– What is Oracle’s best high availability architecture?

– How can we manage this high availability environment?

– What are the performance trade-offs?– How do we repair from various outages?

Examples of Issues That Have Been Addressed

What is the best solution to avoid service disruption for host and instance failures?

Which Disaster Recovery solution should we adopt?

What is the best way to configure the standby database over a network?

How do you configure Oracle Application Server for high availability?

Best Solution to Avoid Service DisruptionReal Application Clusters

Fast Failover– Protection from local site system failures– Faster than cold cluster failover solution– Fast-start fault recovery (instance failure MTTR)

Availability and Accessibility – Allows for scheduled outages

Add and remove nodes transparently

– Transparent Application Failover (TAF) provides uninterrupted service

Best Solution to Avoid Service DisruptionReal Application Clusters

Higher Scalability – All system resources from all nodes are leveraged– Cache fusion eliminates need to partition data or

modify the application – fully application transparent– Connection load balancing distributes connection

requests from application tier

Manageability– Provides a single image of the database to manage

A BB

Fast Instance RecoveryPerformance stays constant as recovery gets faster.

disabled 300 180 900

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200

300

400

500

600

700

800

900

disabled 300 180 90

writes/sec

tps

fast_start_mttr_target setting

Which Disaster Recovery Option?

• Storage or Remote Mirroring, Geo-Clusters

• Vulnerable to human error and data failures. • Latency.

• Streams and Replication• Ideal for active-active configurations that may involve

heterogeneous environments.• Offers finer granularity on what gets replicated and when.

• Data Guard• Provides comprehensive data protection, data availability, and

data recovery benefits, along with an integrated management framework.

Physical/Logical StandbyDatabase

MRP/ LSPRFS

StandbyRedo Logs

ARCH

Data Guard Architecture

Archived Redo Logs

PrimaryDatabase

Transactions

LGWR

Online Redo Logs

ARCH

Oracle Net

Archived Redo Logs

Choosing: Physical or Logical Standby

Questions Recommendations

1. Do you require strict zero data loss?

Yes - use a physical standby databaseNo – go to next question

2. Do you have any unsupported logical standby data types?  

run this query:SELECT DISTINCT OWNER,TABLE_NAME FROM DBA_LOGSTDBY_UNSUPPORTEDORDER BY OWNER,TABLE_NAME; Rows returned – use a physical standby or investigate switching to supported data typeNo rows returned – go to next question

3. Do you need to have the standby database open for read and/or write access?

Yes – evaluate logical standby databaseNo -- evaluate physical standby database

Configuring Standby Over the Network Performance Case Examples

– Primary database in Tokyo and standby database in Kyoto (229 miles and 7ms RTT) in Maximum Protection mode ensure no data loss even in the face of a disaster, with minimum performance impact (2-3%).

– Primary database in San Francisco and standby database in New York (2582 miles and 78ms RTT) in Maximum Performance mode had only seconds of data loss, with minimum performance impact (1%).

Best Practices are Key– Assess bandwidth and latency– Pick the appropriate transport mechanism and protection mode:

ARCH, LGWR SYNC or LGWR ASYNC– Set TCP Socket Buffer Sizes = Bandwidth x Round Trip Latency– Set SDU = 32K– Evaluate SSH port forwarding with compression

Fast Redo ApplyRedo apply out performs high production redo rates.

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High OLTP Batch LoadTransaction Profile

MB

/se

c

Production Redo Rate

Standby Redo AppyRate

Fast SQL ApplySQL Apply can manage high transaction rates.

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Full Read Only None

Consistency Model

TP

S

Oracle Application Server 10g High Availability Middle Tier

– Oracle Application Server OC4J and Web Cache clustering

– Redundant mid-tier servers front ended by a load balancer

Infrastructure– Active Clusters which incorporates Real

Application Clusters– Cold Failover Clusters

Oracle Application Server 10g HA Middle Tier

Application Application Server TierServer Tier

Database TierDatabase Tier

ClientsClients

Web CacheWeb Cache

OC4J ClustersOC4J Clusters

Load BalancerLoad Balancer

Oracle Application Server 10g Active Clusters Infrastructure

MAA in 10g

Continuing to Test and Validate Oracle Database and Application Server 10g– Flashback capabilities, RAC, Data Guard with

Real Time Apply– Rolling upgrades and scheduled maintenance

enhancements– Incorporating best practices into the core 10g

products – Best practices formalized into Oracle Database

and Application Server 10g documentation– MAA White Paper updates

Future MAA Incorporating E-Business Suite Incorporating Collaboration Suite Continuing to work with:

– Internal Deployments– Outsourcing Deployments– Consultants– Partners– External Customers

MAA Test Lab

WAN Traffic Manager

Dedicated Network

Primary Site

RAC

Oracle Application Server

Secondary Site

Oracle Application Server

RACData Guard

F5 Networks

EMC

Hewlett-Packard

Sun Microsystems

Shunra

MAA Information Sources

Oracle Technology Network– http://otn.oracle.com/deploy/availability/htdocs/maa.htm

Maximum Availability Architecture Oracle9i Media Recovery Best Practices Oracle9i Data Guard: SQL Apply Best Practices Oracle9i Data Guard Role Management Best Practices Oracle9i Data Guard Primary Site and Network Configuration

Best Practices Oracle9iAS Cluster configuration

Oracle Consulting – Advanced Technologies Solutions (ATS) Group

– http://otn.oracle.com/consulting/9iServices

Next StepsHigh Availability Sessions from Oracle

11:00 AM

How Oracle Database 10g Revolutionizes Availability and

Enables the Grid

3:30 PM

Oracle Recovery Manager (RMAN) 10g: Reloaded

5:00 PM

Proven Techniques for Maximizing Availability

8:30 AM

Oracle Database 10g - RMAN and ATA Storage in Action

 

11:00 AM

Oracle Data Guard: Maximum Data Protection at Minimum Cost

 

1:00 PM

Oracle Database 10g Time Navigation: Human-Error Correction

 

4:30 PM

Data Guard SQL Apply: Back to the Future

Wednesday in Moscone Room 304Tuesday in Moscone Room 304

For More Info On Oracle HA Go To http://otn.oracle.com/deploy/availability/

Next StepsHigh Availability Sessions from Oracle

8:30 AM in Moscone Room 304

Oracle Database 10g Data Warehouse Backup and Recovery:

Automatic, Simple, Reliable

8:30 AM in Moscone Room 104

Building RAC Clusters over InfiniBand

Thursday

For More Info On Oracle HA Go To http://otn.oracle.com/deploy/availability/

Real Application Clusters

Data Guard

Database Backup & Recovery

Flashback Recovery

LogMiner, Online Redefinition, and Cross Platform Transportable

Tablespaces

Database HA Demos All Four DaysIn The Oracle Demo Campground

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