MongoDB has a top utility like top linux command that displays how much time spent on read, write and total on every name space (collection).


To run mongotop you just need to run:

mongotop

The output is something like below:

root@hs-1:~# mongotop
 2018-01-09T13:42:42.177+0000    connected to: 127.0.0.1

                     ns           total    read    write    2018-01-09T13:42:43Z
                 users.profile     28ms    28ms      0ms
               authz.tokens        7ms     7ms      0ms
                mielin.obx         3ms     3ms      0ms
              conduc.contacts      1ms     1ms      0ms
           admin.system.roles      0ms     0ms      0ms

The above query will run every second, to increase the interval use mongotop YOUR_INTERVAL_INSECOND.

If you want the result in json use mongotop --json.

If you want to return the result once and exit use mongotop --row-count

#mongodb #mongo #mongotop #read #write

See live disk IO status by using iostat:

iostat -dx 1

The output has many columns. The part I'm interested in for now is r/s which refers to read per second and w/s which is write per
second. To see size per second in read and write see columns rkB/s, wkB/s in their corresponding order.

NOTE: if you don't have iostat on your linux os install it on debian by issuing apt-get install sysstat command.


#linux #debian #iostat #read_per_second #write_per_second #sysstat