MongoDB constantly high cpu usage

Question

According to docker container statistics, my mongo database consumes constantly between 250 and 350% cpu. That\'s pretty impressive since it\'s a single core system :P

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Answer 1

There is a function called db.currentOp() which lists the currently running queries with very detailed information, it also includes the duration they have been running (secs_running).

You can then use the currentOp.opid with db.killOp() to kill that query/operation.

If db.currentOp() doesn't return any results, because there is no query which went havoc, then there's also db.setProfilingLevel() which will enable profiling by storing queries into the "local" database. Here's a "Tutorial" which is from the "M102: MongoDB for DBAs" Course.

Further information can also be found in this detailed article "Troubleshooting MongoDB 100% CPU load and slow queries" from Igor Khomenko.