DUAL¶
DUAL is a single-column "dummy" table with one record whose value is X; for example:. DUAL 是一个单列虚拟表，仅有一条值为 X 的记录。
图例
- ✅ = 字段存在于该版本
- ❌ = 字段不存在于该版本
- 备注列标注首次出现或类型变更的版本
| 字段名 | Data Type | 11.0.x | 11.1.x | 12.0.x | 23.3.x | 23.4.x | 24.1.x | 24.2.x | 24.3.x | 24.4.x | 25.1.x | 25.2.x | 25.3.x | 25.4.x | 26.1.x | 26.2.x | 备注 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| IS_ENABLED | BOOLEAN | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | |
| IS_LOCAL_SEGMENT_ENABLED | BOOLEAN | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | |
| IS_REBALANCE_RUNNING | BOOLEAN | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | |
| LOCAL_SEGMENT_LAYOUT | VARCHAR | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | |
| MAXIMUM_SKEW_PERCENT | INTEGER | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | |
| SCALING_FACTOR | INTEGER | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | |
| SEGMENT_LAYOUT | VARCHAR | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | |
| VERSION | INTEGER | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |