When the database is configured to retain logs, each time a log is filled, a request is issued for allocation and initialization of a new log.

当将数据库配置成保留日志，每当写满一个日志时，就会发出一个分配和初始化一个新日志的请求。

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If many resource units of a resource class exist in the system, a resource request only indicates the resource class and the OS checks if any resource unit of that class is available for allocation.

若系统中同一资源类中存在许多资源单位，程序的资源请求只指明要求哪类资源而由操作系统检查该类中是否有可用的资源单位可以分配。

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The method for a group of container storage space request that have been given the priority sequence, recurrent allocation of space, to achieve the minimum use of space.

该方法对于给定了优先序列的一组集装箱空间存放请求，通过递归思想来分配空间，以达到空间占用的最小化。

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