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。
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。
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