ManageEngine® Applications Manager


MongoDB

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MongoDB

Monitored Parameters

MongoDB is monitored based on the parameters or the attributes listed below. These attributes provide information about the functioning of the monitors of MongoDB. You can also configure thresholds to the numerical attributes monitored by the server based on these details.

 

The Availability tab shows the Availability history of the MongoDB for the past 24 hours or 30 days. The Performance tab shows the Health Status and events for the past 24 hours or 30 days. The List view enables you to perform bulk admin configurations. Click on the individual monitors listed to view the following information:

Monitor Information

Displays the basic information like the name of the server, host name, port where it is running and the associated groups.

 

Monitor Snapshot

This tab displays the availability and performance history for the past 6 hours. The businessview will help you have an integrated high-level view of the links between the different nodes in the replica set or sharding server. However, this view will not be available for single servers that are not part of any replica set or sharding server.

 

Server Stats

Parameters

Description

Performance Status

Specifies the used and free memory of the server in percentage.

Memory Utilization Specifies the used, free and total memory of the server in mega bytes.
Current Connections Number of used and available connections in the database server. This will help to asses the current load and capacity requirements of the server.
Network Traffic Specifies the amount of network traffic sent and received by the database, in bytes per second. This value will help you ensure that network traffic sent to and by the mongod process is consistent.
Database Operations Counter The total number of various database operations (insert, get, query, update, command) per second since the mongod instance last started. This data helps to analyze and track the load on the database.
Assert Errors The number of asserts (regular, warning, message, user, rollover) per second raised since the server process started.
Lock Statistics The time, in seconds, since the database last started.
Lock Current Queue Details Number of operations that are currently queued and waiting for the read-lock/ write-lock.
Lock Active Client Details Number of active client connections to the database, performing read/ write operations.
Background Flushes Number of times the database has flushed all writes to disk per second.
Background Flushes Statistics Total number of seconds that the mongod processes have spent writing data to disk.
Journaling Commits Number of transactions written to the journal during the last journal group commit interval. A Journal is a sequential, binary transaction used to bring the database into a consistent state in the event of a hard shutdown. MongoDB performs group commits when journaling, i.e., a series of operations are committed at once over many milliseconds. This is done to achieve high performance.
Journaling Data Number of data in megabytes (MB) written to journal during the last journal group commit interval.
Journaling Statistics Number of seconds spent for each phase of journaling in the last journal group commit interval.

Note: All the metrics above in Server Stats will be displayed for a mongod device. Whereas for a mongos device, only the first six metrics will be displayed.

 

Cursors

Parameters

Description

Number of open cursors

The maximum number of open cursors a session can have at once. You can use this parameter to prevent a session from opening an excessive number of cursors.
Number of timed-out cursors The number of timed out cursors since the last server restart.

 

Index Counters

Parameters

Description

Index Accessed

The number of indexes accessed by a MongoDB statement.
Index served from Memory Indexes that reside in memory and when queried, will be served from memory as long as the whole set fits in the memory.
Index served from Disk Indexes that don't fit in the memory and must be served from disk.
Miss Ratio The ratio of hits to misses. The misses is the total number of times that an operation tried to access an index that was not in memory per collection. The hits is the total number of times that indexes have been accessed and the mongod was able to return the index from memory per collection.

 

Page Faults

Parameters

Description

Total Page Faults

The total number of page faults that occured when MongoDB reads from or writes data to parts of its data files that are not currently located in physical memory or when physical memory is exhausted .
Page Faults Counter

MongoDB on Windows counts both hard and soft page faults. The MongoDB page fault counter may increase dramatically in moments of poor performance and may correlate with limited physical memory environments.

Database Statistics

Parameters

Description

Database Name

The name of the database whose statistics are being monitored.
Collections The number of the Collections, i.e a group of MongoDB documents, in the database.
Objects All the json data and performance objects in a collection.
Avgerage Object Size The average size of all the KEY:VALUE objects contained within the shard.
Data Size The size of data stored in a collection in MB.
Indexes The total number of indexes in the database.
Index Size The total size of all indexes on the database in KB.
File Size The size of the files that hold the database contents in MB.

Replica Stats

Parameters

Description

Replication Details

Status information for MongoDB’s replica set configuration. Only when the current host has replication enabled these values will be displayed.

Replication Operations Counter Total number of various database replication operations (insert, update, delete, getmore, command) per second since the mongod instance last started. These values will help to analyze the load on the replica.
Sharding Operations Counter - Sharded/ NotSharded Total number of various database sharding and notsharding operations (insert, update, delete, getmore, command) per second since the mongos instance last started.

Note: The tab Replica Stats display only replication details for a mongod device and sharding details for a mongos device.

 

 

See Also

Creating New Monitor - Mongo DB Server

 

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