The reliability of data base system is its important function guideline. Data base fault tolerance and breakdown recover are the necessary function in large data base.

数据库系统的可靠性是数据库系统的重要性能指标，数据库容错和故障恢复是大型数据库必备的功能。

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And competition between Google, Facebook, Yahoo, fixed and mobile operators to seize control of the data opportunities of a global and very large customer base in mobile (at least 4 times the size of the fixed line internet population) is impacting on other sectors.

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With a great data system and assessments in place along with a large user base, the platform will be able to start to do A-B testing between different videos to be able to personalize learning for each student.

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