Oracle Disaster Recovery Solution

 

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Agenda • HA/DR Challenges & Oracle Database HA

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• Data Guard Architecture & Features • Process Architecture & Protection Modes • Management Interface • Best Practice & Resources • Case Study • Q&A

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Common Concerns for DR Solutions • Roadblocks for adoption of DR solutions • Perception around the term “Disaster” • “Disaster” often linked to destructive events that occur infrequently, so no strong urge to implement a DR solution 

“When it happens, we will see.” 

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“We do tape backups, and that should be fine, right?” 

• Shortcomings of existing solutions 

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Most DR solutions involve redundant systems that can’t be utilized for productive use The solutions are expensive, with no immediate ROI (till “disaster” occurs) 

“We don’t have budget for machines basically sitting idle.” 

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Market State • Forrester Research, “Six Years After 9/11, Most Firms  Are Not Ready For Another Disaster ”, ”, Sep 11, 2007 “… IT operations professionals are crossing their fingers and hoping a disaster won’t hit, while business executives have no idea how vulnerable they really are to significant losses . . .” (survey .” (survey of 189 enterprises)

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What is a Disaster? • Well-recognized disasters such as headline-grabbing events • Fire, earthquake, tsunami, flood, hurricane, power outages…

mundane events that occur more more frequently •  And . . .more mundane • Faulty system system compone components nts – server, netw network, ork, storage, software, … • Data corruptions • Backup/recovery of bad data • Wrong batch job • Bad HW/SW installations / upgrades / patching • Operator errors • Etc.

• Database down for critical applications, regardless of cause = disaster 

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Business Challenges 49% System

Real Application Clusters

Failures

Continuous Availability for all Applications Continuous Availability for all Applications

12+3%

Unplanned Downtime

Data Failures & Disasters

Data Guard Guaranteed Zero Data Loss

36%

Planned Downtime

Flashback Query

Human Errors

Enable Users to Correct their Mistakes

System

Dynamic Reconfiguration

Maintenance

Capacity on Demand without Interruption

Database Maintenance

Online Operations Re- orgs, orgs, Index builds, Schema Evolution

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What is Data Guard? Primary Site

Standby Site

Data Guard Primary Database

Physical or Logical Standby Database

• Data Availability & Data Protection solution for Oracle •  Any combination of physical physical or logical • Use standby databases for queries, reports, test, or backups while in standby role

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Active Data Guard 11g  11g  Offloa Offload d Processing– Processing– Improv Improve e Primary Primary Performa Performance! nce! Read-write Workload Real-time

Real-time Reporting Real-time

Reporting

Queries Fast Incremental Backups

Fast Incremental Backups

Continuous redo shipping, validation & apply

Production Database

Active Standby Database

• Offload read-only queries to an up-to-date physical standby • Use fast inc incremen remental tal backu backups ps on a physical st standby andby – up to 20x faste faster  r  8

 

Data Guard Snapshot Standby Use Standby Databases as Test Systems

Updates

Queries Updates redo data

Primary Database

Physical PhysicalStandby Standby Snapshot Standby Database Database

DGMGRL> convert database <name> to snapshot standby; DGMGRL> convert database <name> to physical standby; 9

 

Deploying Data Guard Protection Mode Controls Response to Failure Events

Mode Maximum Protection Maximum

Risk of data loss

Transport

If no acknowledgement from standby:

SYNC

Stall primary until acknowledgement is received from replica

Zero Data Loss Double Failure Protection Zero Data Loss

 Availability

Single Failure Protection

Maximum Performance

Potential for  Minimal Data Loss

SYNC  ASYNC

Stall primary until acknowledgement is received or timeout threshold period expires  – then resume processing Primary never waits for standby acknowledgement

 NET_TIMEOU  NET_TIMEOUT T parameter parameter of LOG_ARCHIVE_DES LOG_ARCHIVE_DEST_n T_n Data Guard 11g  11g default default = 30 seconds Data Guard 10g  10g default default = 180 seconds 10

 

Switchover and Failover  • Switchover  • Planned role reversal • No database reinstantiation required • Used for maintenance of OS or hardware

• Failover

• Unplanned failure of primary • Use Flashback Database to reinstate original primary

• Manually execute via SQL or simple GUI interface, or  •  Automate failover using using Data Guard Fas Fast-Start t-Start Failover 

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Data Guard Switchover  Reduce Downtime for Planned Events

• Database Rolling Upgrades • Scheduled power outages and site maintenance • Data center moves • Migrations to ASM and/or RAC Technology y refr refresh esh – serve servers rs an and d storage storage • Technolog • Windows/Linux migrations * • 32bit/64bit migrations* • HP-UX/PA RISC to HP-UX/IPF migrations* • Implement major database changes in rolling fashion • e.g. ASSM, initrans, blocksize * see Metalink Note 413484.1 12

 

Application Failover  Primary Site and Application Tier is Still Viable Primary Site

Standby Site 3  Application Tier Tier - Oracle  Application Server Server Clusters

FAN breaks clients out of TCP timeout, applications quickly reconnect to new primary 2

Data Database base TierTier- Ora Oracle cle Real Application Clusters

Database Services Primary Database

Data Guard 1 Data Guard Manual or  Redo Transport Automatic Failover 

Startup trigger  is used to relocate primary database services

Standby Standby becomes Database primary database

• MAA Best Practices for Client Failover in a Data Guard Configuration • Demo Demonstra nstrations tions – Autom Automatic atic Databa Database, se, Applica Application tion & Complete Complete Site Site Failover  Failover  13

 

Complete Site Failure Standby Site Primary Site

Primary Site WAN traffic manager 

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Firewall

 Application Tier - Oracle  Application Server Clusters

 Automatic DNS WAN traffic manager  failover routes users to new Firewall primary site 2

Start mid-tier  Firewall

Firewall

Database base TierTier- Ora Oracle cle Data Real Application Clusters

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Data Guard Guard Data Automatic Failover  Redo Transport

Standby becomes primary

• Chapter 4.2.1 4.2.1 of HA Best Practices Practices – complete site site failover  failover  • Demonstrations – Automating Site Failover, E-Biz Suite and Siebel Apps 14

 

Data Guard Management Interfaces • SQL*Plus Command Line • Requires connecting to each database, primary and standby

• Data Guard Broker  • DGMGRL Command Line • Monitor process runs on all databases in a Data Guard config • Single command performs work of multiple SQL*Plus commands manage ge •  Attach to any database in a Data Guard configuration and mana all databases as a single configuration

• Enterprise Manager Grid Control

• GUI interface that interacts with the Data Guard Broker 

• No separate license purchase required

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Enterprise Manager 

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Data Guard Best Practices <Insert Picture Here>

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Where do I begin?

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How much bandwidth do I need?

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How will Data Guard impact performance?

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How far apart can I locate primary and standby databases?

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Physical or logical standby? Which management interface do I use?

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How do I protect against data corruptions?

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How much time and effort is required to failover? How do I failover applications as well as the database?

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How do I minimize planned downtime?

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Resources • Oracle Data Guard on OTN http://www.oracle.com/technology/deploy/availability/htdocs/DataGuardOverview.html

• Oracle HA Portal on OTN

http://www.oracle.com/technology/deploy/availability/

• Maximum Availability Architecture (MAA) white papers and demonstrations http://www.oracle.com/technology/deploy/availability/htdocs/maa.htm

• Oracle HA Customer Success Stories on OTN:

http://www.oracle.com/technology/deploy/availability/htdocs/HA_CaseStudies.html

• Taneja Group - New Appr Approaches oaches to Da Data ta P Protec rotection tion and DR http://www.oracle.com/technology/deploy/availability/htdocs/analysts/tanejagroupdatabasestorage.pdf 

• Enterprise Strategy Group – Data Pr Protection otection and Dis Disaster aster R Recovery ecovery http://www.oracle.com/technology/deploy/availability/htdocs/analysts/enterprisestrategygroupdataguard.pdf 

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Agenda • HA/DR Challenges & Oracle Database HA

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• Data Guard Architecture & Features • Process Architecture & Protection Modes • Management Interface • Best Practice & Resources • Case Study • Q&A

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