1emc confidential—internal use only overview of sql server 2012 high availability and disaster...
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1EMC CONFIDENTIAL—INTERNAL USE ONLY
Overview of SQL Server 2012
High Availability and Disaster Recovery (HADR)
Wei FanTechnical Partner Management – MicrosoftJanuary 2012
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Agenda• Business Case for HADR
• Prior to SQL Server 2012: HADR Review
• What is New in HADR of SQL Server 2012
• Demo
• Q & A
Footer information: 10 pt. MetaNormalLF—NOT italics
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Business Case for HADR
• Data loss
• Downtime
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Business Risks and Solutions
Business Risk Solution
High Availability
Potential downtime ofdatabase service
Redundant database system components
Disaster Recovery
In case that database service is down with potential data loss, get database service back online with minimum impact
Redundant data. Redundant database system components .
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HADR Strategy Principle: Redundancy
Data Redundancy
Database Service Redundancy
Hardware Redundancy
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History of SQL-based Data Redundancy• SQL Backup and Restore (SQL Server 6.5)
• SQL Log Shipping (SQL Server 7.0)
• SQL Transactional Replication (SQL Server 7.0)
• SQL Failover Cluster (SQL Server 7.0)
- HADR Enhancements (SQL Server 2000)
• SQL Snapshot (SQL Server 2005)
• SQL Mirroring (SQL Server 2005)
- HADR Enhancements (SQL Server 2008 & R2)
• SQL AlwaysOn (SQL Server 2012)
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Permitted downtime (planned & unplanned)
Uptime SLA Downtimeper Year
Downtimeper Month
95% 18.25 days 36 hours
98% 7.30 days 14.4 hours
99% 3.65 days 7.20 hours
99.9% 8.76 hours 43.8 minutes
99.99% 52.6 minutes 4.38 minutes
99.999% 5.26 minutes 0.438 minutes
99.9999% 31.5 seconds 2.59 seconds
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SQL HADR Categories by Standby Modes
Standby
ModeFailover Behavior SQL Server Feature
Coldstand
by
• Manual intervention required to ready data copy
• Backup and restore
Warm stand
by
• Data copy ready to use
• Manual failover required
• Transaction log shipping
• Transactional replication
• Database mirroring
Hot stand
by
• Automatic failover • Database mirroring• Failover clustering• AlwaysOn
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SQL HADR Categories by DB/Instance HADR
Prior to SQL 2012
SQL 2012
Database Level HADR
Backup and RestoreLog ShippingTransactional Replication
SQL SnapshotSQL Mirroring
AlwaysOn High Availability Group
Instance Level HADR SQL Failover Cluster AlwaysOn Failover Cluster
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SQL HADR Review
Prior to SQL Server 2012
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Database Backup & Restore
Full Database BackupDifferential Database BackupTransaction Log Backup
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Pros & Cons: Database Backup & Restore
Pros: Physical database backup
filesSimple and easy to perform
Cons:Not a high availability
solutionPossible data loss
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Scorecard: AlwaysOn vs. Backup & Restore
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Log Shipping
Continuous backup and restore
Standby server
Asynchronous
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Pros & Cons: Log Shipping
Pros: Automatic restore processMultiple secondary servers
Cons:Possible data lossManual failoverIssue with reporting in standby
server
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Scorecard : AlwaysOn vs. Log Shipping
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Transactional Replication
Transactional Replication
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Pros & Cons: Transactional Replication
Pros: Automatic restore processSecondary servers for
reporting appMultiple secondary servers
Cons:Designed for data, not for
schemaManual failover
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Scorecard : AlwaysOn vs. SQL Replication
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SQL Failover Cluster Instance: FCI
• Instance level
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Pros & Cons: SQL Failover Cluster Instance
Pros: High availability solutionAutomatic failover No lost data Coupled with SAN as shared
arrayCons:
High cost Restricted to local subnet
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Scorecard : AlwaysOn FC vs. SQL FC
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Database Snapshot
Data-pageCopy-on-write
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Pros & Cons: Database Snapshot
Pros: Maintaining historical data Snapshot as a reporting
databaseMany snapshots
Cons:Depend on the primary
databaseRestriction of same server
instance
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Scorecard: AlwaysOn vs. SQL Snapshot
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Database Mirroring
Hot standby databaseSync/Async modes
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Pros & Cons: Database Mirroring
Pros: Sync mode with automatic
failover Async mode for performanceEasy to setup
Cons:Single databaseStandby server not accessible
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Scorecard : AlwaysOn vs. SQL Mirroring
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SQL Server 2012 HADR
AlwaysOn High Availability Group (HAG)
AlwaysOn Failover Cluster Instance (FCI)
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AlwaysOn: High Availability Group
• Installation
• Windows cluster
• No-clustered SQL Server
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Configure High Availability Group (AlwaysOn)
• Replica• Database level• Many databases• Failover in groups • Multiple replicas• Sync/Async mode
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High Availability Group: Active Secondary
R/W work loadPrimary backupSecondary backup
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High Availability Group: Active Secondary
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Pros & Cons: High Availability Group
Pros: Synchronous/asynchronous modeFailover on multiple databasesAutomatic failoverUp to 4 replicasActive replicas
Cons:Perf issue in provisioning large databasesPerf issue when updating indexes on large
databases
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AlwaysOn: Failover Cluster Instance - FCI
• Instance level• Multi-subnet
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Scorecard: AlwaysOn HAG vs. AlwaysOn FC
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AlwaysOn Failover: FCI + HA
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AlwaysOn Failover: FCI + HA
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EMC MV/CE
• Combines Microsoft Failover Cluster and EMC Mirror View• Support failover in storage level• Geographical cluster• Synchronous/Asnychronous mode
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Scorecard : AlwaysOn vs. EMC MV/CE
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Demonstration
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Q&A