One is to purge data; the other is to recover costs.
一个是清除数据；另一个就是收回成本。
If yes, purge the data and tune the index if needed.
如果是，清除数据并在需要的情况下优化索引。
Purge: in some recent history tables, every few days the entire table is dropped and recreated because data is now available in another table with a longer history.
清洗：在某些最近历史表中，每过一些天就删除整个表，并重新创建表，数据将放在有更长历史的另一个表中。
The empty table is then ready to ingest new data until its next purge date.
然后，重新创建的空表又可以摄取新的数据，直到清洗日的到来。
The empty table is then ready to ingest new data until its next purge date.
然后，重新创建的空表又可以摄取新的数据，直到清洗日的到来。
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