MMFM constructs streamlines like in-core methods through mapping largedatafile into virtual RAM, and reduces page faults by organizing data in spatial blocks.
方法MMFM将大规模数据文件映像成虚拟RAM,利用空间分块组织数据,减少缺页请求;
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Every time you move to a row, you probably do not want to retrieve the column with the largedatafile, because doing so would slow down your application's performance.