- Release Notes and Announcements
- User Guide
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Access Management
- Instance Management
- Node Management
- Version Upgrade
- Monitoring
- Backup and Rollback
- Data Security
- SSL Authentication
- Database Management
- Multi-AZ Deployment
- Public Network Access
- Disaster Recovery/Read-Only Instances
- Parameter Configuration
- Recycle Bin
- Task Management
- Performance Optimization
- Data Migration Guide
- Best Practice
- Optimizing Indexes to Break Through Read/Write Performance Bottlenecks
- Troubleshooting Mongos Load Imbalance in Sharded Cluster
- Troubleshooting Excessive Slow Queries
- Fixing High CPU Utilization in MongoDB Instance Based on DBbrain
- Troubleshooting Excessive Connections
- Troubleshooting High Request Latency Based on Slow Log
- Troubleshooting High CPU Utilization
- Considerations for Using Shard Clusters
- Sample of Reading and Writing Data in MongoDB Instance
- Export and Import
- Troubleshooting MongoDB Connection Failures
- Performance Fine-Tuning
- Ops and Development Guide
- Troubleshooting
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Instance APIs
- RenameInstance
- OfflineIsolatedDBInstance
- ModifyDBInstanceSpec
- IsolateDBInstance
- DescribeSpecInfo
- DescribeDBInstances
- DescribeClientConnections
- CreateDBInstanceHour
- AssignProject
- RenewDBInstances
- DescribeSlowLogs
- DescribeSlowLogPatterns
- InquirePriceRenewDBInstances
- InquirePriceModifyDBInstanceSpec
- InquirePriceCreateDBInstances
- DescribeDBInstanceDeal
- DescribeSecurityGroup
- DescribeInstanceParams
- ModifyDBInstanceSecurityGroup
- ModifyDBInstanceNetworkAddress
- Backup APIs
- Account APIs
- Task APIs
- Other APIs
- Data Types
- Error Codes
- Instance Connection
- FAQs
- Service Agreement
- Glossary
- Contact Us
- Release Notes and Announcements
- User Guide
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Access Management
- Instance Management
- Node Management
- Version Upgrade
- Monitoring
- Backup and Rollback
- Data Security
- SSL Authentication
- Database Management
- Multi-AZ Deployment
- Public Network Access
- Disaster Recovery/Read-Only Instances
- Parameter Configuration
- Recycle Bin
- Task Management
- Performance Optimization
- Data Migration Guide
- Best Practice
- Optimizing Indexes to Break Through Read/Write Performance Bottlenecks
- Troubleshooting Mongos Load Imbalance in Sharded Cluster
- Troubleshooting Excessive Slow Queries
- Fixing High CPU Utilization in MongoDB Instance Based on DBbrain
- Troubleshooting Excessive Connections
- Troubleshooting High Request Latency Based on Slow Log
- Troubleshooting High CPU Utilization
- Considerations for Using Shard Clusters
- Sample of Reading and Writing Data in MongoDB Instance
- Export and Import
- Troubleshooting MongoDB Connection Failures
- Performance Fine-Tuning
- Ops and Development Guide
- Troubleshooting
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Instance APIs
- RenameInstance
- OfflineIsolatedDBInstance
- ModifyDBInstanceSpec
- IsolateDBInstance
- DescribeSpecInfo
- DescribeDBInstances
- DescribeClientConnections
- CreateDBInstanceHour
- AssignProject
- RenewDBInstances
- DescribeSlowLogs
- DescribeSlowLogPatterns
- InquirePriceRenewDBInstances
- InquirePriceModifyDBInstanceSpec
- InquirePriceCreateDBInstances
- DescribeDBInstanceDeal
- DescribeSecurityGroup
- DescribeInstanceParams
- ModifyDBInstanceSecurityGroup
- ModifyDBInstanceNetworkAddress
- Backup APIs
- Account APIs
- Task APIs
- Other APIs
- Data Types
- Error Codes
- Instance Connection
- FAQs
- Service Agreement
- Glossary
- Contact Us
This document describes the version and storage engine information of TencentDB for MongoDB to help you select appropriate options.
Versions and Storage Engines
TencentDB for MongoDB supports WiredTiger and Rocks storage engines.
WiredTiger
With a typical Btree structure, WiredTiger greatly outperforms MMAPv1, MongoDB's legacy storage engine. It provides concurrency control and compression mechanisms at different granularities, significantly reducing the storage costs. It offers the optimal performance and storage efficiency for different types of applications. WiredTiger is the default storage engine in MongoDB 3.2.
Rocks
Rocks organizes data based on the log-structured merge-tree (LSM tree) structure and specifically optimizes data write capabilities, which guarantee constantly efficient data writes and make it suitable for scenarios involving more writes but fewer reads. It is supported by MongoDB 3.2 only.
Version | Storage Engine |
v3.2 | WiredTiger Rocks |
v3.6 | WiredTiger |
v4.0 | WiredTiger |
v4.2 | WiredTiger |
v4.4 | WiredTiger |
Version Description
Feature Description | Subfeature | v3.2 | v3.6 | v4.0 | v4.2 | v4.4 |
Network | Classic network | Unsupported | Unsupported | Unsupported | Unsupported | Unsupported |
| VPC | Supported | Supported | Supported | Supported | Supported |
| Security group | Supported | Supported | Supported | Supported | Supported |
| Network change | Supported | Supported | Supported | Supported | Supported |
Billing mode | Pay-as-you-go | Supported | Supported | Supported | Supported | Supported |
| Batch renewal | Supported | Supported | Supported | Supported | Supported |
| Monthly subscribed instance return | Supported | Supported | Supported | Supported | Supported |
| Pay-as-you-go instance termination | Supported | Supported | Supported | Supported | Supported |
| Message subscription and notification | Supported | Supported | Supported | Supported | Supported |
Elasticity | Mongod configuration adjustment | Supported | Supported | Supported | Supported | Supported |
| Node quantity adjustment | Supported | Supported | Supported | Supported | Supported |
| Single-shard node quantity adjustment | Supported | Supported | Supported | Supported | Supported |
| Shard quantity adjustment | Unsupported | Supported | Supported | Supported | Supported |
| Mongos access address enablement | Unsupported | Unsupported | Supported | Supported | Supported |
| Mongos node specification adjustment (sharded cluster) | Unsupported | Unsupported | Supported | Supported | Supported |
| Secondary node promotion to primary node | Unsupported | Supported | Supported | Supported | Supported |
| Oplog capacity adjustment | Supported | Supported | Supported | Supported | Supported |
Instance operation | Instance list | Supported | Supported | Supported | Supported | Supported |
| Instance restart | Supported | Supported | Supported | Supported | Supported |
| Batch instance restart | Supported | Supported | Supported | Supported | Supported |
| Instance termination | Supported | Supported | Supported | Supported | Supported |
| Switch to another project | Supported | Supported | Supported | Supported | Supported |
| Tag management | Supported | Supported | Supported | Supported | Supported |
| Password reset | Supported | Supported | Supported | Supported | Supported |
| Auth-free access | Unsupported | Supported | Supported | Unsupported | Supported |
| Version upgrade | Unsupported | Supported | Supported | Supported | Unsupported |
| Maintenance time modification | Supported | Supported | Supported | Supported | Supported |
| Read-only instance | Supported | Supported | Supported | Supported | Supported |
| Disaster recovery instance | Supported | Supported | Supported | Supported | Supported |
| Multi-AZ deployment | Supported | Supported | Supported | Supported | Supported |
System monitoring | Monitoring metric list | Supported | Supported | Supported | Supported | Supported |
| Data comparison | Supported | Supported | Supported | Supported | Supported |
| Alarm rule configuration | Supported | Supported | Supported | Supported | Supported |
| Monitoring data export | Supported | Supported | Supported | Supported | Supported |
| Multi-instance comparison and monitoring | Supported | Supported | Supported | Supported | Supported |
Backup and rollback | Backup list | Supported | Supported | Supported | Supported | Supported |
| Manual backup | Supported | Supported | Supported | Supported | Supported |
| Automatic backup | Supported | Supported | Supported | Supported | Supported |
| Backup file download | Supported | Supported | Supported | Supported | Supported |
| Instance clone | Supported | Supported | Supported | Supported | Supported |
| Collection rollback (replica set) | Supported | Supported | Supported | Supported | Supported |
| Collection rollback (sharded cluster) | Unsupported | Unsupported | Unsupported | Unsupported | Unsupported |
| Automatic backup policy configuration | Supported | Supported | Supported | Supported | Supported |
Database management | Account creation | Supported | Supported | Supported | Supported | Supported |
| Account password change | Supported | Supported | Supported | Supported | Supported |
| Account permission configuration | Supported | Supported | Supported | Supported | Supported |
| Slow log query | Supported | Supported | Supported | Supported | Supported |
| Slow log request management | Supported | Supported | Supported | Supported | Supported |
| Slow log download | Supported | Supported | Supported | Supported | Supported |
| Connection management | Supported | Supported | Supported | Supported | Supported |
Task management | List data loading | Supported | Supported | Supported | Supported | Supported |
| Filter by time | Supported | Supported | Supported | Supported | Supported |
| Filter by instance name | Supported | Supported | Supported | Supported | Supported |
| Viewing task details | Supported | Supported | Supported | Supported | Supported |
Database audit | Audit instance | Unsupported | Unsupported | Supported | Supported | Supported |
| Audit log | Unsupported | Unsupported | Supported | Supported | Supported |
Recycle bin | List of instances in recycle bin | Supported | Supported | Supported | Supported | Supported |
| Resuming instance | Supported | Supported | Supported | Supported | Supported |
| Batch instance restoration | Supported | Supported | Supported | Supported | Supported |
| Instance elimination | Supported | Supported | Supported | Supported | Supported |
Migration | Public network migration | Supported | Supported | Supported | Supported | Supported |
| Self-Build on CVM | Supported | Supported | Supported | Supported | Supported |
| Migration over direct connect | Supported | Supported | Supported | Supported | Supported |
| Migration over VPN | Supported | Supported | Supported | Supported | Supported |
| Database migration | Supported | Supported | Supported | Supported | Supported |
| Migration over CCN | Supported | Supported | Supported | Supported | Supported |
Performance optimization | Exception diagnosis | Supported | Supported | Supported | Supported | Supported |
| Performance trends monitoring | Supported | Supported | Supported | Supported | Supported |
| Slow query analysis | Supported | Supported | Supported | Supported | Supported |
| Space analysis | Supported | Supported | Supported | Supported | Supported |
| MongoStatus | Supported | Supported | Supported | Supported | Supported |
| MongoTop | Supported | Supported | Supported | Supported | Supported |
| Real-time session | Supported | Supported | Supported | Supported | Supported |
| Index recommendation | Supported | Supported | Supported | Supported | Supported |
| SQL throttling | Supported | Supported | Supported | Supported | Supported |
Minor Version Description
WiredTiger storage engine on v4.4
Minor Version | New Feature, Optimization, or Fix |
WT.44.13.0 | Supported MongoDB 4.4. |
WiredTiger storage engine on v4.2
Minor Version | New Feature, Optimization, or Fix |
WT.42.11.15 | Supported auditing database events with custom rules. Supported accessing the database through SSL authentication. |
WT.42.11.14 | Improved the stability of moveChunk of the kernel. |
WT.42.11.13 | Supported using commands to enable the enhanced changeStream mode. |
WT.42.11.12 | Fixed the issue where an error was reported when creating and deleting a duplicate database repeatedly. Fixed changeStream issues. |
WT.42.11.11 | Fixed the kernel exception during applyOps. |
WT.42.11.10 | Optimized the database audit performance. |
WT.42.11.9 | Supported database collection rollback through physical backup to speed up backups. |
WT.42.11.8 | Optimized the routing information refresh policy. |
WT.42.11.7 | Optimized the control logic for adding shards. |
WT.42.11.6 | Supported DDL operations for changeStream. |
WT.42.11.5 | Optimized kernel parameters to improve the performance. |
WT.42.11.4 | Blocked high-risk system operations. |
WT.42.11.3 | Fixed the exception of the getMore operation. |
WT.42.11.2 | Supported the maxTimeMS parameter. |
WT.42.11.1 | Supported the online compact command. |
WT.42.11.0 | Supported MongoDB 4.2. |
WiredTiger storage engine on v4.0
Minor Version | New Feature, Optimization, or Fix |
WT.40.3.34 | Supported auditing database events with custom rules. Supported accessing the database through SSL authentication. |
WT.40.3.33 | Supported speed limit for TTL indexing. Supported setting the clearing window for expired TTL data. |
WT.40.3.32 | Improved the instance stability after database collection rollback through physical backup. Fixed memory leaks after connection failures. |
WT.40.3.31 | Supported SQL throttling. |
WT.40.3.30 | Supported customizing the slow query threshold. |
WT.40.3.29 | Optimized the database audit performance. |
WT.40.3.28 | Optimized the routing information refresh policy for sharded clusters. |
WT.40.3.27 | Supported database collection rollback through physical backup. |
WT.40.3.26 | Optimized the retry lock logic during write conflicts to improve the performance. |
WT.40.3.25 | Optimized user permissions to avoid unauthorized operations. |
WT.40.3.24 | Prohibited creating LSM engine collections and indexes. |
WT.40.3.23 | Optimized the logic for adding shards. |
WT.40.3.22 | Optimized the lock mechanism. |
WT.40.3.21 | Optimized the changeStream logic. |
WT.40.3.20 | Optimized the performance. |
WT.40.3.19 | Optimized the session logic. |
WT.40.3.18 | Optimized the secondary database read performance. |
WT.40.3.17 | Optimized the password-free access logic. |
WT.40.3.16 | Optimized the monitoring data collection logic. |
WT.40.3.15 | Supported database collections with millions of records. |
WT.40.3.14 | Optimized the physical backup performance in case of many files. |
WT.40.3.13 | Optimized the mongos connection mechanism. |
WT.40.3.12 | Optimized the routing information refresh logic and audit performance. |
WT.40.3.11 | Enhanced changeStream capabilities. |
WT.40.3.10 | Supported the maxTimeMS parameter. |
WT.40.3.9 | Supported mongos overload protection. |
WT.40.3.8 | Supported database audit |
WT.40.3.7 | Optimized the session logic. |
WT.40.3.6 | Improved the database connection performance and startup performance in case of many files. |
WT.40.3.5 | Supported password-free access. |
WT.40.3.4 | Fixed abnormal bloats of database disk files. |
WT.40.3.3 | Supported Pv6. |
WT.40.3.2 | Supported blocking writes to full disks. Supported displaying the client connection information. |
WT.40.3.1 | Supported the superGeo command.Supported physical backup. Added new monitoring metrics. |
WT.40.3.0 | Released MongoDB 4.0 based on the WiredTiger engine. |
WiredTiger storage engine on v3.6
Minor Version | Description |
WT.36.8.12 | Optimized the password-free access logic. Optimized the display effect of the client list. |
WT.36.8.11 | Optimized the connection performance. |
WT.36.8.10 | Optimized the logic of session and cross-node data sync. |
WT.36.8.9 | Supported physical backup. |
WT.36.8.8 | Supported password-free access. |
WT.36.8.7 | Optimized the mongos connection pool mechanism. |
WT.36.8.6 | Optimized the connection logic. |
WT.36.8.5 | Supported IPv6. |
WT.36.8.4 | Optimized the monitoring data collection logic. |
WT.36.8.3 | Optimized the disk blocking logic. |
WT.36.8.2 | Optimized the connection model. |
WT.36.8.1 | Optimized the security mechanism. |
WT.36.8.0 | Supported v3.6. |
WiredTiger storage engine on v3.2
Minor Version | Description |
WT.32.12.9 | Supported setting the maximum timeout period of requests and creating indexes with the instance in the background by default. |
WT.32.12.8 | Optimized the mongos connection pool mechanism. |
WT.32.12.7 | Supported IPv6 and its parameter configuration. |
WT.32.12.6 | Optimized kernel connection parameters to improve the performance. |
WT.32.12.5 | Fixed issues such as occasional kernel exception. |
WT.32.12.4 | Supported the superGeoNear command. |
WT.32.12.3 | Optimized kernel parameters to improve the performance. |
WT.32.12.2 | Supported adjusting the oplog capacity. |
WT.32.12.1 | Supported dynamically adjusting the number of connections. |
WT.32.12.0 | Supported the WiredTiger engine of MongoDB 3.2. |
Rocks storage engine on v3.2
Minor Version | Description |
ROCKS.32.12.3 | Optimized connection parameters and performance. |
ROCKS.32.12.2 | Optimized the secondary database read performance. |
ROCKS.32.12.1 | Supported read requests from secondary databases and optimized snapshot expiration parameters. |
ROCKS.32.12.0 | Supported the Rocks storage engine. |
Yes
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