mongoDB remove和drop操作的时间性能

db.tester.remove({}); //remove（）用的时候必须要有{} WriteResult({ “nRemoved” : 100 })

for(var i=0;i<100;i++){ db.tester.insert({“foo”:”bar”,”baz”:i,”z”:10-i}) } WriteResult({ “nInserted” : 1 }) var timeRemoves = function(){ var start = (new Date()).getTime(); db.tester.remove({}); db.tester.findOne(); var timeDiff = (new Date()).getTime()-start; print(timeDiff); } **> timeRemoves(); 6** for(var i=0;i<100;i++){ db.tester.insert({“foo”:”bar”,”baz”:i,”z”:10-i}) } WriteResult({ “nInserted” : 1 }) var timeRemoves = function(){ var start = (new Date()).getTime(); db.tester.drop(); db.tester.findOne(); var timeDiff = (new Date()).getTime()-start; print(timeDiff); } **> timeRemoves(); 2**