Metro Mirror用于对数据进行第一次备份，再由Global Mirror复制第一次备份作为第二次备份。

Metro Mirror is used to replicate to the first backup, and then Global Mirror is used to replicate from the first backup to a second backup.

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在工作中能运用高等数学概念，如指数，对数，二次方程序和排列。

Ability to apply advanced mathematical concepts such as exponents, logarithms, quadratic equations, and permutations.

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根据测井生产中的对数据加以管理的实际需求，本文简要地论述了设计一个小型、易于移植和可供二次开发的数据库管理系统的设计和实现方法。

This article is devoted to the design and implementation of a small, portable and ease to handle DBMS, according to the real need of the management to data used in well logging.

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We've seen log, we've seen linear, we've seen quadratic, we've seen exponential.

我们看过了对数级的，线性的，二次平方的，指数级的算法。

麻省理工公开课 - 计算机科学及编程导论课程节选