def __run__(params):
    try:
        from pymongo import MongoClient
    except ImportError:
        return [2, "CRITICAL - Error: Please install python-pymongo"]

    try:
        param = params.get("db")
        host = params.get("host", "localhost")
        port = int(params.get("port", "27017"))
    except Exception, e:
        return [2, "CRITICAL - Error: %s" % repr(e)]

    try:
        client = MongoClient(host,port)
    except Exception, e:
        return [2, "CRITICAL - Error: %s" % repr(e)]

    dbs = client.database_names()
    if param in dbs:
        return [0,"OK"]
    else:
        return [2, "CRITICAL - Error: database is not avaliable"]