Roy Ernest

Database AdministratorPinnacle Sports Worldwide

royernest@yahoo.com

SQL Server High Availability

ContentsWhat is High Availability (HA)What is Disaster Recovery (DR)What are the options of HADatabase MirroringCons of database mirroring

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What is HAHigh availability is the percentage of Uptime

of your applications. HA percentage is defined by your SLA.There are different methods to achieve this.

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What is DR Disaster recovery is the method by which you can minimize the impact of a disaster. Two types of disasters are

1. Physical2. Logical

How can we recover from a disaster?

What are the options available for HA?

Database Clustering.Log Shipping. Replication. Database Mirroring.

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Database MirroringWhat is Database mirroring?Pros of Database mirroring.Things to watch out for.

ReplicationAdding file group

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How to setup Database mirroring?Make sure that the DB is in FULL Mode.Take a back up, transaction log back upRestore back up and T-Log to mirror with

NORECOVERYUse GUI from the Primary to set up mirror.

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Primaryuse mastergoBackup database AdventureWorks to disk ='E:\

ADW.Bak' with init,CompressiongoBackup log AdventureWorks to disk ='E:\

ADW.trn' with init,Compressiongo

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Secondary. In the Master Database executerestore database AdventureWorks from disk

='E:\ADW.Bak' with norecovery, replace,move 'AdventureWorks_Data' to 'E:\Denali\

Data\AdventureWorks_data.mdf',move 'AdventureWorks_log' to 'C:\Denali\Log\

AdventureWorks_log.ldf', stats = 10go

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Secondary. In the Master Database executerestore log AdventureWorks from disk ='E:\

ADW.trn' with norecovery, replace,move 'AdventureWorks_Data' to 'E:\Denali\Data\AdventureWorks_data.mdf',

move 'AdventureWorks_log' to 'C:\Denali\Log\AdventureWorks_log.ldf', stats = 10

go

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CONCLUSION

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DANKI!Jan 27th, 2011 24Curaçao SQL Server User Group