Question : This Query scans only one document and returns only one document. But this is very slow: 2017-05-22T07:13:24.548+0000 I […]
Tag: mongodb-3.2
what does that mean? COMMAND [PeriodicTaskRunner] task: UnusedLockCleaner took: 273ms
Question : With mloginfo I found a strange log entry. Didn’t find anything about it in MongoDB docs and other […]
Mongo shell 3.2 has different results on sh.isBalancerRunning() as mongo shell 3.4
Question : I have a mongo shards cluster and a mongos instance. These servers are running on MongoDB 3.4.0. When […]
mysql_install_db equivalent for MongoDB? Error ‘handle-open: open: Too many open files’
Question : A developer created millions of collections and indexes, this means millions of collection-* and index-* files. I have […]
mongodb Query per sec troubleshooting
Question : I manage a MongoDB replica set for one of my customer and sometimes he send me a ticket […]
Update single field in a document (document.update($set)?)
Question : Can’t seem to figure out how to update a single field. Whatever I try, to update one field […]
what is “killcursors: found 0 of 1” from mongodb.log with replicaset?
Question : This is output of mloginfo log –distinct. What does killcursors mean exactly and what’s the DBA action? We […]
Unable to add replica set to shard
Question : I was trying to add a new replica set to my mongodb sharded cluster but I keep getting […]
Replica Set not getting created
Question : I have database which is set up in data folder of mongodb. For accessing this database I usually […]
Assertion failure _state.get() error in MongoDB during mongorestore
Question : I would like to say i am newbie in mongodb,today i have tried to restore dump file .I […]