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From MongoDB docs

To report the use of per-database locks, use --locks

Changed in version 3.0.0: When called against a mongod that does not report lock usage, --locks will return a Failed: Server does not support reporting locking information error

I receive this error

mongotop -vvv --host localhost --authenticationDatabase admin -u $USER -p $PASSWD  --port 27100 --locks
2016-08-29T14:29:41.477+0200    Failed: server does not support reporting lock information

Howto enable lock usage in MongoDB 3.2.8? Do I need a special startup parameter?

Sybil
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1 Answers1

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You can't. --locks option is used to report per-database locks. Starting from MongoDB 3.0 (for most operations) there are collection-level locks on MMAPv1 storage engine and document-level for wiredTiger and MongoRocks. You can find more info about concurrency here: https://docs.mongodb.com/manual/faq/concurrency/

Option --locks is useful only for MongoDB 2.x

Bartlomiej Nogas
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