################
var dd = function(x) { var s = x.toString(); if(s.length > 1){return s;} else { return "0"+s;}}

for (var i=1; i<18; i++) { 
	var col = "ll_1806"+dd(i); 
	print(col); 
	db.getCollection(col).createIndex({date: -1}, {expireAfterSeconds: 15552000, name: "expire", background: true}); 
}

###########
var dd = function(x) { var s = x.toString(); if(s.length > 1){return s;} else { return "0"+s;}}

for (var m=1; m<=12; m++) { 
	for (var d=1; d<=31; d++) { 
		var col = "ll_15"+dd(m)+dd(d); 
		if (db.getCollection(col).exists != null) {
			print(col); 
			print(db.getCollection(col).totalSize()); 			
		}
	}
}


####
var ar = db.getCollectionNames()
var len = ar.length

for (var i=0; i<len; i++) { if (ar[i].startsWith("ll")) { print(db.getCollection(ar[i]))}}


####
db.lastlogin_1703.createIndex({date: -1}, {expireAfterSeconds: 15552000, name: "expire", background: true})