MongoDB monitoring with mongostat
Daniel Watrous Another tool for monitoring the performance and health of a MongoDB node is mongostat. You’ll recall that mongotop shows the time in milliseconds that a mongo node spent accessing (read and write) a particular collection.
mongostat on the other hand provides more detailed information about the state of a mongo node, including disk usage, data throughput, index misses, locks, etc. However, the data is general to the mongo node and doesn’t indicate which database or collection the status refers to. As you would expect, both utilities, mongotop and mongostat, are required to get a full picture of the state of a node and which databases/collections are most affected.
Here’s some sample output from mongostat for two different servers, a PRIMARY and a SECONDARY.
insert query update delete getmore command flushes mapped vsize res faults locked db idx miss % qr|qw ar|aw netIn netOut conn set repl time *0 208 *0 *0 0 4|0 0 5.76g 12.1g 87m 0 documents:0.0% 0 0|0 0|0 16k 70k 23 wildcatset SEC 15:28:29 *0 197 *0 *0 0 1|0 0 5.76g 12.1g 87m 0 documents:0.0% 0 0|0 0|0 15k 65k 23 wildcatset SEC 15:28:30 *0 215 *0 *0 0 3|0 0 5.76g 12.1g 87m 0 documents:0.0% 0 0|0 0|0 16k 71k 23 wildcatset SEC 15:28:31 *0 198 *0 *0 0 1|0 0 5.76g 12.1g 87m 0 documents:0.0% 0 0|0 0|0 15k 65k 23 wildcatset SEC 15:28:32 *0 227 *0 *0 0 3|0 0 5.76g 12.1g 87m 0 documents:0.0% 0 0|0 0|0 17k 75k 23 wildcatset SEC 15:28:33 |
insert query update delete getmore command flushes mapped vsize res faults locked db idx miss % qr|qw ar|aw netIn netOut conn set repl time 0 269 0 0 1 2 0 5.56g 11.8g 85m 0 documents:0.0% 0 0|0 0|0 20k 89k 43 wildcatset PRI 15:28:32 0 216 0 0 0 2 0 5.56g 11.8g 85m 0 documents:0.0% 0 0|0 0|0 16k 72k 43 wildcatset PRI 15:28:33 0 227 0 0 0 3 0 5.56g 11.8g 85m 0 documents:0.0% 0 0|0 0|0 17k 77k 43 wildcatset PRI 15:28:34 0 235 0 0 0 2 0 5.56g 11.8g 85m 0 documents:0.1% 0 0|0 0|0 18k 77k 43 wildcatset PRI 15:28:35 0 214 0 0 0 2 0 5.56g 11.8g 85m 0 documents:0.0% 0 0|0 0|0 16k 71k 43 wildcatset PRI 15:28:36 |
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