Finding and (Safely) Killing Long-Running MongoDB Ops

Find long-running ops

db.currentOp().inprog.forEach(
  function(op) {
    if (op.secs_running > 5) printjson(op);
  }
)

Kill long-running ops

This script terminates long-running operations in MongoDB, taking a seconds parameter to define what counts as “long-running.” It prioritizes safety by filtering out replication operations and focusing exclusively on queries rather than broader command types.

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 for over secs: "
                    + op.secs_running);
            db.killOp(op.opid);
        }
    }
};

// example: killLongRunningOps(5)