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Update dm-precheck.md
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qiancai committed Mar 21, 2022
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## 使用场景

为了使数据迁移任务顺利进行,DM 在启动迁移任务时会自动触发任务前置检查。只有当前置检查通过后,DM 才开始执行迁移任务。
为了使数据迁移任务顺利进行,DM 在启动迁移任务时会自动触发任务前置检查,并返回检查结果。只有当前置检查通过后,DM 才开始执行迁移任务。

如果你想要手动触发前置检查,运行 `check-task` 命令即可。

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