go to site As a DBA sometimes we came across the situation when we have to choose a best High Availability and Disaster recovery solutions.

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http://wilsonrelocation.com/?q=what-is-forex what is forex Each has its own advantages and limitations.

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To provide an accurate choice which technology to use, DBAs must have through understanding of business needs for high availability, How fast  should fail-over happen,how many replicas  required and if reads can happen on the secondary. Each SQL Server High availability technology has  short comings on a different dimensions.

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here Here is a quick table for reference.

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http://theiu.org/?alisa=%D8%AE%D9%8A%D8%A7%D8%B1-%D8%AB%D9%86%D8%A7%D8%A6%D9%8A-%D9%81%D9%8A-%D8%A7%D9%84%D9%85%D9%85%D9%84%D9%83%D8%A9-%D8%A7%D9%84%D9%85%D8%AA%D8%AD%D8%AF%D8%A9&d0b=4b Feature  http://theshopsonelpaseo.com/?syzen=%D8%A7%D9%83%D8%AA%D8%AA%D8%A7%D8%A8%D8%A7%D8%AA-%D8%A7%D9%84%D8%A7%D8%B3%D9%87%D9%85-%D8%A7%D9%84%D8%B3%D8%B9%D9%88%D8%AF%D9%8A%D8%A9&08f=b2 Fail over clustering http://parts.powercut.co.uk/?risep=%D8%A7%D9%84%D8%AE%D9%8A%D8%A7%D8%B1%D8%A7%D8%AA-%D8%A7%D9%84%D8%AB%D9%86%D8%A7%D8%A6%D9%8A%D8%A9-%D8%A7%D9%84%D8%AA%D8%AF%D8%A7%D9%88%D9%84-%D8%A7%D9%84%D9%81%D9%8A%D8%B3%D8%A8%D9%88%D9%83&1eb=88 Database Mirroring  http://asect.org.uk/?ilyminaciya=%D8%AA%D8%AF%D8%A7%D9%88%D9%84-%D8%A7%D9%84%D8%A3%D8%B3%D9%87%D9%85-%D9%85%D8%A8%D8%A7%D8%B4%D8%B1&d2e=33 Log Shipping source url Transactional Replication
Storage redundancy ?  No Yes Yes Yes
 No need for special hardware? No Yes Yes Yes
Role change automatically Yes Yes No No
No need for additional server ? None Witness Monitor* Distributor*
Reports read from secondary ? NA No Read only Yes
Scope of availability Instance level Complete Database Complete Database Database Objects
 Multiple secondary client NA No Yes Yes
Auto redirection after failover Yes No: Need custom solution No: Need custom solution No: Need custom solution
Recovery Model Any Full Full Any