Which data tier would you recommend for a mission-critical database that needs to be highly available all the time?
A. Tier 1
B. Tier 2
C. Tier 3
D. Tier 4
Answer: A
Tier 1 data is defined as mission-critical, recently accessed, or secure files and should be stored on expensive and highly available disks such as RAID with parity. Tier 1 storage systems have better performance, capacity, reliability, and manageability.
Tier 2 data is data that runs major business applications, for example, e-mail and ERP. Tier 2 is a balance between cost and performance. Tier 2 data does not require sub-second response time but still needs to be reasonably fast.
Tier 3 data includes financial data that needs to be kept for tax purposes but is not accessed on a daily basis and so does not need to be stored on the expensive tier 1 or tier 2 storage systems.
Tier 4 data is data that is used for compliance requirements for keeping e-mails or data for long periods of time. Tier 4 data can be a large amount of data but does not need to be instantly accessible.
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