Scalability concepts

Google BigTable
http://labs.google.com/papers/bigtable.html

BigData : are datasets that grow so large that they become awkward to work with
http://en.wikipedia.org/wiki/Big_data

Hadoop

MapReduce : Google framework

Dynamo: Amazon's Highly Available Key-value Store
http://www.allthingsdistributed.com/files/amazon-dynamo-sosp2007.pdf

- Master / slave
- peer to peer
- cluster: similar components
- grid: different components

aptitude search result

p, meaning that no trace of the package exists on the system,
c, meaning that the package was deleted but its configuration files remain on the system,
i, meaning that the package is installed,
v, meaning that the package is virtual.

The second character indicates the stored action (if any; otherwise a blank space is displayed) to be performed on the package
i, meaning that the package will be installed,
d, meaning that the package will be deleted,
p, meaning that the package and its configuration files will be removed.

If the third character is A, the package was automatically installed