Required 9’s

Question

I keep seeing reference to "Required 9's" in the documentation for SQL Server 2012 HA, but I can't find the actual list of what these nines are.
Could someone please be so kind as to give me the list of Required 9's or explain the term?

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Michéle Johl

Answer 1

Hi,

Required 9s means its a term to represent sql server up time with SQL Server 2012 .99.99999 is the server uptime .

Every one wants server uptime 99.9999 .we can achive this figure by useing SQL Server 2012 HA(Always On) .

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Thanks&Regards Siva G

Answer 2

Siva,

Thank you so much for the answer.

That question has been bothering me for some time.

Regards,

Michéle

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Michéle Johl

Answer 3

This article explains it well http://en.wikipedia.org/wiki/High_availability

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David A. Bermingham, MVP, Senior Technical Evangelist, SIOS Technology Corp

Answer 4

Thank you David,

The Percentage calculation table of how the nines work explains it really well. I searched on Wikipedia for "required 9's", but I should have tried High Availability as well.

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Michéle Johl