udacity statistics

A push iOS Advanced research engineer Small BagObjectiveWith the rapid development of the mobile internet market, the former "Happy Rodeo" style of rough operation era has become the past. The change of the big environment also leads to the data statistic analysis of the mobile end plays more and more important role in the product research and development, the decision-making, the operation and so on, "the fine operation" has become the hot word for a time-from the factory to the entrepreneurial

Professor Zhang Zhihua: machine learning--a love of statistics and computationEditorial press: This article is from Zhang Zhihua teacher in the ninth China R Language Conference and Shanghai Jiaotong University's two lectures in the sorting out. Zhang Zhihua is a professor of computer science and engineering at Shanghai Jiaotong University, adjunct professor of data Science Research Center of Shanghai Jiaotong University, doctoral tutor in computer sc

statistics on non-indexed columnsSometimes, there may not be an index on a column in a join or filter condition. Even for such non-indexed columns, if the query optimizer knows the data distribution (statistics) of these columns, it is also likely to make the best choice.In addition to the statistics on the index, SQL Server can establish

Tags: drop ora way and data test var sub glob In the recent study of Oracle statistics, the method for collecting statistics is as follows:Dbms_stats. Gather_table_stats (Ownname VARCHAR2,---owner name tabname VARCHAR2,---table name partname VARCHAR2 DEFAULT NULL,---The partition name to parse Estimat E_percent number DEFAULT NULL,---the scale of the sample block_sample BOOLEAN default FALSE,---whether bloc

Tags: why sequential images use text also margin analysis The source of this article: http://www.cnblogs.com/wy123/p/6008477.html For statistics on the number of rows of data estimates, previously written on the non-related columns (separate or separate index columns) of the algorithm, refer to here.Today, let's write the statistical information on the calculation methods and potential problems of the composite index at the time of estimation.This pap

If we want the CBO to use the statistics of reasonable use of the data to correctly determine the quickest way to execute any SQL query, it is necessary to use the Analyze command or dbms_stats the statistics of the data in a timely manner.For example, in the index skip scan example, if you do not collect statistics for table employee and index, it is not the ind

1. Install Baidu statistics on discuz: First, get and install it in Baidu statisticsCodeLog on to the discuz background, go to global> site information>, copy and paste the statistics code to the "Third-Party website statistics code" text box, and click Submit. 2. Install Baidu statistics using phpwind: Fir

1. Statistical Information view1.1 Global statistics for individual tables, viewing of statistical effects2. Statistical information Analysis (collection)2.1 Analysis Tool Selection2.2 To do index reconstruction before analysis2.3 Analyze a data table that can be executed under the PL/SQL command window2.4 Analysis schema, performed in Sqlplus2.5 Dbms_stats.gather_schema_stats Detailed2.6 Initialization parameter Statistics_level relationship to Oracl

However, statistics are inaccurate after dbms_stats analysis on some forums, and some bugs are found on dbms_stats (which may be related to the version, which is to be checked ). However, statistics are inaccurate after dbms_stats analysis on some forums, and some bugs are found on dbms_stats (which may be related to the version, which is to be checked ). Use dbms_stats or analyze Since Oracle8.1.5 int