This document describes and compares the features supported by different types of TencentDB for MySQL instances, providing a guide for you to learn more about the features of all architectures and purchase instances according to your needs.
| Feature | Two-node Instance | Three-node Instance | Single-node Instance | |
|---|---|---|---|---|
| Resource isolation policy | General | General | General | Basic |
| Database engine version | MySQL 5.7 | |||
| Node quantity | 2 | 3 | 1 | 1 |
| Memory/Disk | Up to 488 GB/6 TB | Up to 488 GB/6 TB | Up to 488 GB/6 TB | Up to 8 GB/1 TB |
| Upgrading database engine version | Supported (MySQL 5.5 and 5.6 only) | Supported | Supported | Supported |
| Upgrading to three-node instances | Supported | - | - | - |
| Read-only replicas | Supported (only in MySQL 5.6, 5.7, and 8.0) | Supported | Supported | - |
| Managing accounts | Supported | Supported | - | Supported |
| Setting parameters | Supported | Supported | - | Supported |
| Backup | Supported | Supported | - | - |
| Rollback | Supported | Supported | - | - |
| Data migration | Supported | Supported | Supported | - |
| Importing SQL files | Supported | Supported | - | - |
| Security groups | Supported | Supported | Supported | - |
| Monitoring and alarms | Supported | Supported | Supported | Supported |
| Operation logs | Supported | Supported | Supported | Supported |
Note：
"-" in the table above means "unsupported".
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