What are issues with hosting a database on the cloud?

[cookret]

We want to use cloud computing to host an application. Due to volume, the database can take 10+ hours to index the data.
If the individual server that is hosting the database goes down, will we have to wait for the data to be re-indexed or is this type of redundancy built in to the cloud?

[swizzle]

What DB are you talking about, MySQL? I think that you need Redis for this needs

[adamsmith111]

We can meet several problem in database management such as...

Duplicate content
Data redundancy
Anomaly

etc...