在该例中，分区号是0，因为我们处理的是单分区数据库。
The partition number is 0 in this case because we are dealing with a single-partition database.
对于单分区数据库，您可以对数据库分区号仅指定- 1(当前分区)或- 2(所有分区)，结果是一样的。
For a single partition database, you can just specify -1 (current partition) or -2 (all partitions) for the database partition number and the results will be the same.
您需要在单分区的环境中模拟生产中的整个数据库以进行测试。
You want to mimic the whole database in production to test, in a single partition environment.
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