Sharding strategy
- Supports ranged sharding.
- You can combine the shard keys of fields.
- Sharding is required for all data sets under a sharding instance. It is recommended to place non-sharded data in a separate replica set instance.
Authentication mechanism
Fully compatible with two mechanisms: SCRAM-SHA-1 and MONGODB-CR.
Supported sharding cluster commands
| Commands | Subcommands | Support | |
|---|---|---|---|
| CRUD basic commands | find | filter | Yes |
| sort | Yes | ||
| projection | Yes | ||
| hint | Yes | ||
| skip | Yes | ||
| limit | Yes | ||
| batchSize | Yes | ||
| singleBatch | Yes | ||
| comment | Yes | ||
| maxScan | Yes | ||
| maxTimeMS | Not Supported | ||
| readConcern | Yes | ||
| max | Yes | ||
| min | Yes | ||
| returnKey | Yes | ||
| showRecordId | Yes | ||
| snapshot | Not Supported | ||
| tailable | Not Supported | ||
| oplogReplay | Not Supported | ||
| noCursorTimeout | Yes | ||
| awaitData | Not Supported | ||
| allowPartialResults | Not Supported | ||
| insert | Must include shardkey field, the shard keys must be consistent during batch insert operations | Yes | |
| update | The update field cannot be shardkey | Yes | |
| delete | Yes | ||
| findandmodify | Yes | ||
| count | Yes | ||
| distinct | Must include shard key | Yes | |
| aggregate | Not Supported | ||
| group | Not Supported | ||
| mapReduce | Not Supported | ||
| getmore | Yes | ||
| getLastError | Not Supported | ||
| getPrevError | Not Supported | ||
| resetError | Not Supported | ||
| eval | Not Supported | ||
| geoNear | Not Supported | ||
| geoSearch | Not Supported | ||
| parallelCollectionScan | Not Supported | ||
| Diagnostic commands | collStats | Yes | |
| dbstats | Yes | ||
| explain | Yes | ||
| listDatabases | Yes | ||
| serverStatus | Not Supported | ||
| top | Not Supported | ||
| Sharding commands | enableSharding | Yes | |
| shardCollection | Yes | ||
| Managment commands | listCollections | Yes | |
| dropDatabase | Yes | ||
| drop | Yes | ||
| creareIndexes | Yes | ||
| listIndexes | Yes | ||
| dropIndexes | Yes | ||
| logout | Yes | ||
| renameCollection | Not Supported | ||
| copydb | Not Supported | ||
| create | Not Supported | ||
| clone | Not Supported | ||
| cloneCollection | Not Supported | ||
| cloneCollectionAsCapped | Not Supported | ||
| convetToCapped | Not Supported | ||
| filemd5 | Not Supported | ||
| fsync | Not Supported | ||
| clean | Not Supported | ||
| connPoolSync | Not Supported | ||
| connectionStatus | Not Supported | ||
| compact | Not Supported | ||
| collMod | Not Supported | ||
| reIndex | Not Supported | ||
| setParameter | Not Supported | ||
| getParameter | Not Supported | ||
| repairDatabase | Not Supported | ||
| repairCursor | Not Supported | ||
| touch | Not Supported | ||
| shutdown | Not Supported | ||
| logrotate | Not Supported | ||
| killop | Not Supported | ||
| User management commands | Not Supported | ||
| Role management commands | Not Supported | ||
| Replica set commands | Not Supported |
