The in-memory sort operation can be made effective (from storage and computation standpoints) under the fact that each list li is ordered by itself.

如果每个列表Li由自已排序，那么内存内的排序操作(从存储和计算的角度)可以变得很有效。

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Cleanup: This operation is used for storage maintenance.

cleanup：该操作用于存储维护。

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Successfully posting to the log is also considered a commit (the data is safely stored to persistent storage), allowing the database operation to complete and continue.

提交时也会查看是否成功发布到日志（数据是否安全地存储到持久性存储器），成功后才允许数据库完成操作或进行下一步操作。

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