预迁移步骤非常重要，是实现成功迁移的关键。

The pre-migration steps are very important, and are key to a successful migration. In this section, you will do essentially three tasks.

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迁移完成后，对数据库进行备份，如预迁移一节中的步骤一所示。

Backup your database after migration completion, as shown in step 1 of the Pre-migration section.

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通过运行预迁移一节的步骤2中的相同命令收集所有数据库信息。

Gather all the database information by running the same commands as in step 2 in the Pre-migration section.

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