You should create an index in a separate table space so that if something goes wrong with the index table space, you can easily drop it and then recreate the same indexes.

您应该在单独的一个表空间上创建索引，这样如果索引表空间出现问题，您可以直接删除该表空间，然后重要创建相同的索引。

youdao

If you do decide to drop an index, you should first save its create index statement so that you can easily recreate it if necessary.

如果您决定删除索引，那么首先要保存它的CREATE index语句，以便在需要时轻松地重新创建它。

youdao

You can use ALTER TABLE with the DROP VERSIONING clause for the same purpose, but IBM suggests sparse use of DROP VERSIONING because it can cause invalidation, which should be avoided if possible.

您可以使用ALTER TABLE和DROP versioning子句实现相同用途，但IBM建议尽量少使用DROP VERSIONING，因为它可能导致无效性，这应该尽可能避免。

youdao

So you should drop the homework before you come into class, rather than furiously work on it during class, and the solutions will be posted the same afternoon.

所以你应该在进教室之前交作业,而不是在上课的时候乱写一通,作业答案会在当天下午发布到网上

耶鲁公开课 - 基础物理课程节选