// kills long running ops in MongoDB (taking seconds as an arg to define "long")
// attempts to be a bit safer than killing all by excluding replication related operations
// and only targeting queries as opposed to commands etc.
killLongRunningOps = function(maxSecsRunning) {
    currOp = db.currentOp();
    for (oper in currOp.inprog) {
        op = currOp.inprog[oper-0];
        if (op.secs_running > maxSecsRunning && op.op == "query" && !op.ns.startsWith("local")) {
            print("Killing opId: " + op.opid
            + " running over for secs: "
            + op.secs_running);
            db.killOp(op.opid);
        }
    }
};

killLongRunningOps(阈值时间，如1);

来自：http://dba.stackexchange.com/questions/60029/how-do-i-safely-kill-long-running-operations-in-mongodb

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