ListKeys or MapReduce

rkevinburton at rkevinburton at
Mon Feb 11 13:30:27 EST 2013

Say I need to determine how many document there are in my database. For 
a CorrugatedIron application I can do ListKeys and get the warning that 
it is an expensive operation or I can do a MapReduce query. Which is the 
the least expensive? Is there an option that I am missing?
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