I have this data:

server down 11/1/2013
out of memory 11/1/2013
database down 11/2/2013
database down 11/3/2013
server down 11/4/2013
server down 11/4/2013
server down 11/4/2013
server down 11/4/2013
thunder 11/5/2013
server down 11/5/2013
server down 11/5/2013
out of memory 11/6/2013
….. ……



How can I graph this that is shows occurrence of each type of incident in a graph over time?

cheers