最近在看<Spark for Data Science>这本书,阅读到<Machine Learning>这一节的时候被稀疏矩阵的存储格式CSC给弄的晕头转向的.所以专门写一篇文章记录一下我对这种格式的理解. 目的 Compressed Sparse Column Format (CSC)的目的是为了压缩矩阵,减少矩阵存储所占用的空间.这很好理解,手法无法就是通过增加一些"元信息"来描述矩阵中的非零元素存储的位置(基于列),然后结合非零元素的值来表示矩阵.这样在…
翻译没有追求信达雅,不是为了学英语翻译,是为了快速了解新特性,如有语义理解错误可以指正.欢迎加微信12735770或QQ12735770探讨oracle技术问题:) In-Memory Column Store内存列存储 Starting in Oracle Database 12c Release 1 (12.1.0.2), the In-Memory Column Store (IM column store) is an optional, static SGA pool that sto…
Normally, we have created a table, view in database or cube in SSAS, user can use Excel as a BI tool to display data. Here we have an Actual, Budget and Forecast data cube in SSAS. Open Excel, click "Data"->"From Other Sources"->…
P6 Professional Installation and Configuration Guide (Microsoft SQL Server Database) 16 R1 May 2016 Contents About This Guide...................................................................................... 11 Shared Topics in This Guide .…
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常用commond alter user scott account unlock; --解锁账号 alter user scott identified by new_pwd; --设置密码 lsnrctl status/start/stop:监听服务的状态,启动,停止命令 conn sys/password@... as sysdba; --切换管理员账号 sqlplus scott/tiger@localhost:1521/orcl.168.11.134 jdbc:oracle:thin:…
The world is awash with digital transformation. Every customer and partner that I talk to, across every industry, is pursuing it. Why? To stay ahead of the competition, realize new opportunities, new markets and reimagine how they do business. For co…