加载指定数量的Amazon EC2实例。
如果未检测到指定数量的Mbean，工具将会无限期等待。
If the specified number is not detected, the tool will wait in an infinite loop.
检查点定义数据库在加载流程中成功处理指定数量的记录时的时间点。
A checkpoint defines a point during the loading process at which the database has successfully processed a specified number of records.
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