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change lightning conflict resolution ignore (#18641) #18644

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merged 4 commits into from
Sep 14, 2024
Merged

change lightning conflict resolution ignore (#18641) #18644

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ea89d79
This is an automated cherry-pick of #18641
D3Hunter Sep 14, 2024
02be47b
Update tidb-lightning/tidb-lightning-logical-import-mode-usage.md
D3Hunter Sep 14, 2024
ff9bcb2
Update tidb-lightning/tidb-lightning-logical-import-mode-usage.md
D3Hunter Sep 14, 2024
b58d503
Update tidb-lightning/tidb-lightning-logical-import-mode-usage.md
D3Hunter Sep 14, 2024
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3 changes: 2 additions & 1 deletion tidb-lightning/tidb-lightning-logical-import-mode-usage.md
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Expand Up @@ -49,10 +49,11 @@ TiDB Lightning 的完整配置文件可参考[完整配置及命令行参数](/t

冲突数据是指两条或两条以上记录中存在主键或唯一键列数据重复。TiDB Lightning 的逻辑导入模式通过 [`conflict.strategy`](/tidb-lightning/tidb-lightning-configuration.md#tidb-lightning-任务配置) 配置冲突数据的处理行为，使用不同的 SQL 语句进行导入。

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| 策略 | 冲突时默认行为 | 对应 SQL 语句 |
|:---|:---|:---|
| `"replace"` | 新数据替代旧数据 | `REPLACE INTO ...` |
| `"ignore"` | 保留旧数据，忽略新数据 | `INSERT IGNORE INTO ...` |
| `"ignore"` | 保留旧数据，忽略新数据 | 如果 `conflict.threshold` 大于 `0`，则为 `INSERT INTO ...`；如果 `conflict.threshold` 为 `0`，则为 `INSERT IGNORE INTO ...` |
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| `"error"` | 终止导入 | `INSERT INTO ...` |
| `""` | 不进行冲突检查和处理，但如果存在有主键和唯一键冲突的数据，会在后续步骤报错 | 无 |

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