在几个线程中卸载少数几个大表，并相应地分阶段转移数据，以此估算时间。
Estimate your time by unloading a few large tables in a few threads, and accordingly stagger the movement of the data.
通过编辑文件，删除不需要的表并把它分割为几个输入文件，这样就可以采用分阶段转移方式，也就是并行地执行从源数据库卸载和装载到目标数据库。
Edit the file to remove unwanted tables and split it into several input files to do a staggered movement approach where you perform unload from source and load to target in parallel.
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