slowms is associated with the Database Profiler. The database profiler collects detailed information about Database Commands executed against a running mongod instance; the profiler is off by default. You can view the slowms value (from the shell). This is what I found on my MongoDB v4.2 CE: db.getProfilingStatus()9 nov 2020
How does MongoDB detect slow queries?
One can identify slow queries in MongoDB by enabling the profiler and configuring it to its some specifications or executing db. currentOp() on a running mongod instance. By looking at the time parameters on the returned result, we can identify which queries are lagging.22 may 2020
What should I monitor in MongoDB?
- Normalized System CPU.
- Normalized Process CPU.
- Disk Latency.
- Disk IOPS.
- Disk Space Free.
- System Memory.
- Swap Usage.
What is profiler in MongoDB?
The database profiler collects detailed information about Database Commands executed against a running mongod instance. This includes CRUD operations as well as configuration and administration commands. The profiler writes all the data it collects to a system.
How do I enable slow query log in MongoDB?
MongoDB slow query log profiling is easy using db. setProfilingLevel(). Enable slow query log mongoDB Profiling for logging for slow query with your threshlold time.
Does MongoDB log slow queries?
The database logs all slow queries to the log, even when the profiler is not turned on. When the database profiler is on, mongod the profiler writes to the system.9 feb 2015
Why are my MongoDB queries slow?
The slow queries can happen when you do not have proper DB indexes. ... Without indexes, MongoDB must perform a collection scan, i.e. scan every document in a collection, to select those documents that match the query statement. And it can take a while if you have many documents in your collection.16 nov 2017
Is MongoDB slower than SQL?
MongoDB offers faster query processing but with an increased load and system requirements. Without knowing the purpose of use, it is not possible to classify SQL Databases or NoSQL Databases like MongoDB as better or worse than the other. There are various factors that drive the MongoDB vs SQL decision.11 feb 2021
How do I enable logging in MongoDB?
- Stop the MongoDB service. On the Windows Service Manager window, right-click the Commvault MongoDB(InstanceXXX) instance, and then select Stop.
- Enable logging for the MongoDB service. ...
- Start the MongoDB service. ...
- Verify that logging is enabled.
What is slow query in MongoDB?
We also call it “slow queries”. The slow queries can happen when you do not have proper DB indexes. Indexes support the efficient execution of queries in MongoDB. Without indexes, MongoDB must perform a collection scan, i.e. scan every document in a collection, to select those documents that match the query statement.16 nov 2017