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# mongodb
Module monitor mongodb performance and health metrics
**Requirements:**
- `python-pymongo` package v2.4+.
You need to install it manually.
Number of charts depends on mongodb version, storage engine and other features (replication):
1. **Read requests**:
- query
- getmore (operation the cursor executes to get additional data from query)
2. **Write requests**:
- insert
- delete
- update
3. **Active clients**:
- readers (number of clients with read operations in progress or queued)
- writers (number of clients with write operations in progress or queued)
4. **Journal transactions**:
- commits (count of transactions that have been written to the journal)
5. **Data written to the journal**:
- volume (volume of data)
6. **Background flush** (MMAPv1):
- average ms (average time taken by flushes to execute)
- last ms (time taken by the last flush)
7. **Read tickets** (WiredTiger):
- in use (number of read tickets in use)
- available (number of available read tickets remaining)
8. **Write tickets** (WiredTiger):
- in use (number of write tickets in use)
- available (number of available write tickets remaining)
9. **Cursors**:
- opened (number of cursors currently opened by MongoDB for clients)
- timedOut (number of cursors that have timed)
- noTimeout (number of open cursors with timeout disabled)
10. **Connections**:
- connected (number of clients currently connected to the database server)
- unused (number of unused connections available for new clients)
11. **Memory usage metrics**:
- virtual
- resident (amount of memory used by the database process)
- mapped
- non mapped
12. **Page faults**:
- page faults (number of times MongoDB had to request from disk)
13. **Cache metrics** (WiredTiger):
- percentage of bytes currently in the cache (amount of space taken by cached data)
- percantage of tracked dirty bytes in the cache (amount of space taken by dirty data)
14. **Pages evicted from cache** (WiredTiger):
- modified
- unmodified
15. **Queued requests**:
- readers (number of read request currently queued)
- writers (number of write request currently queued)
16. **Errors**:
- msg (number of message assertions raised)
- warning (number of warning assertions raised)
- regular (number of regular assertions raised)
- user (number of assertions corresponding to errors generated by users)
17. **Storage metrics** (one chart for every database)
- dataSize (size of all documents + padding in the database)
- indexSize (size of all indexes in the database)
- storageSize (size of all extents in the database)
18. **Documents in the database** (one chart for all databases)
- documents (number of objects in the database among all the collections)
19. **tcmalloc metrics**
- central cache free
- current total thread cache
- pageheap free
- pageheap unmapped
- thread cache free
- transfer cache free
- heap size
20. **Commands total/failed rate**
- count
- createIndex
- delete
- eval
- findAndModify
- insert
21. **Locks metrics** (acquireCount metrics - number of times the lock was acquired in the specified mode)
- Global lock
- Database lock
- Collection lock
- Metadata lock
- oplog lock
22. **Replica set members state**
- state
23. **Oplog window**
- window (interval of time between the oldest and the latest entries in the oplog)
24. **Replication lag**
- member (time when last entry from the oplog was applied for every member)
25. **Replication set member heartbeat latency**
- member (time when last heartbeat was received from replica set member)
## prerequisite
Create a read-only user for Netdata in the admin database.
1. Authenticate as the admin user.
```
use admin
db.auth("admin", "<MONGODB_ADMIN_PASSWORD>")
```
2. Create a user.
```
# MongoDB 2.x.
db.addUser("netdata", "<UNIQUE_PASSWORD>", true)
# MongoDB 3.x or higher.
db.createUser({
"user":"netdata",
"pwd": "<UNIQUE_PASSWORD>",
"roles" : [
{role: 'read', db: 'admin' },
{role: 'clusterMonitor', db: 'admin'},
{role: 'read', db: 'local' }
]
})
```
### configuration
Sample:
```yaml
local:
name : 'local'
authdb: 'admin'
host : '127.0.0.1'
port : 27017
user : 'netdata'
pass : 'netdata'
```
If no configuration is given, module will attempt to connect to mongodb daemon on `127.0.0.1:27017` address
---
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