similar issue with leveldb (level down)

gistfile1.txt

var levelup = require('levelup')
 , crypto = require('crypto');

var db = levelup('./mydb', {cacheSize: 0});

function uniqueGet(num){

    if( num == 0 ) return;
	
	var hash = crypto.createHash('md5').update( num.toString() ).digest("hex");

	db.get(hash, function(err,result){
		return uniqueGet(--num);
	});

}

uniqueGet(5000000);