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Automatic Collection of Oracle 10g statistical information (automatic statistics gathering)

1. What is statistics: Optimization statistics are collected to describe the database and database objects in more detail. These statistics are used to select the optimal execution plan for SQL statements. The optimized statistics include: Table statistics (Table

Oracle Automatic Performance statistics

Oracle Automatic Performance statistics?? Efficient diagnosis of performance problems, need to provide complete statistics available, like the doctor to the patient's palpation, to be able to correctly diagnose, and then prescribe the corresponding prescription. The Oracle database generates multiple types of cumulative statistics for systems, sessions, and indiv

Analysis on the concept of website traffic statistics and website visit

Access | concept | traffic | statistics The basic meaning of website traffic statistics:Website traffic statistics, refers to the site access to the relevant indicators for statistics, commonly used Web site traffic statistics include three categories: (1) Web site traffic indicators, such as in a certain statistical c

Using distribution statistics in the DB2 optimizer

This article supporting source code Brief introduction In order to execute a query or DML statement (INSERT, UPDATE, DELETE), DB2 must create an access plan (access plans). The access plan defines the order in which the tables are accessed, which indexes are used, and what connection (join) methods are used to correlate the data. A good access plan is critical for fast execution of SQL statements. The DB2 optimizer can create access plans. This is a cost-based optimizer, which means that it ma

Oracle Performance Analysis 11: System statistics

The cost calculation for the early Oracle query optimizer is based on the physical reading required to execute the SQL statement, which is called the I/O overhead mode (I/O cost model), and the main disadvantage of this method is that the Stompbox read and the multiple block read overhead are equivalent. In Oracle 8i, initialization parameters optimizer_index_caching and Optimizer_index_cost_adj solve this problem, but the default values for parameters apply only to reporting systems and data wa

SQL Server collects statistics and analyzes _mssql of statement operations

For a statement to run, there are other factors to consider, in addition to the execution plan itself, such as the compile time of the statement, the execution time, how many disk reads have been made, and so on. If the DBA is able to run the problem statement individually, you can open the following three switches before running to collect statistics about the statement running. This information is valuable for analyzing problems. Copy Code c

Analysis of the effect of statistics on query in SQL Server _mssql

And every time the Query Analyzer looking for the path, and not every time to statistics the number of rows included in the index, the range of values, but based on certain conditions to create and update the information after the save to the database, which is called statistical information. How to view statistics Viewing SQL Server statistics is simple, using

Baidu statistics easy to use the advantages and disadvantages of Baidu statistical function

This is an article and Baidu statistics related articles. Every person engaged in the work related to the site operation should use the site Statistics tool, familiar with its usage. Website Statistics tool can help us to statistics website traffic data (IP, UV, PV and so on, so as to combine the site's own situation o

Experience analysis of several characteristics of Baidu statistics

Some time ago promised to write an article about Baidu statistics, using Baidu statistics for a period of time, this time to write, so that Baidu statistics interested and dare not use the webmaster reference. Thought for a moment, I from Baidu Statistics report order to Baidu sta

SQL Server statistics impact on queries

Introduction The SQL Server Query analyzer is overhead-based. Generally, the query analyzer determines how to select an efficient query route based on the predicate, such as the index to be selected. When the analyzer looks for a path, it does not count the number of rows and ranges of values contained in the index every time, instead, the information is created and updated based on certain conditions and saved to the database. This is the so-called statistical information. How to view

How to Use distribution statistics in the DB2 optimizer?

This article describes how to use distribution statistics in the DB2 optimizer? We all know that the DB2 optimizer is a cost-based optimizer. It makes a decision based on the statistical information of the table and the actual operation index. DB2 not only provides basic statistics, but also allows the creation of so-called distribution statistics. This article e

Oracle system statistics

System statistics mainly describe some features related to system hardware, such as the performance and utilization of cpu and io systems. This information is very important for the query optimizer. During the execution plan selection process, the oracle optimizer uses the system statistics to evaluate the cost of the execution plan. Therefore, accurate system statistic

Blogs statistics Tool, Traffic Analysis

The following is a detailed description of the types of statistical tools used by a blog. I will list the final results: Google Analytics + Yahoo statistics + clicki I personally suggest you add feedsky if your website has many RSS subscriptions. Reference: http://fairyfish.net/2008/01/03/blog-stat/ What statistical tools does a blog need? This is a problem that has plagued many blogger and is also a general problem, because different levels o

Linux disk space Size statistics du command common usage

Under Linux, you can count the amount of space a file or folder occupies, and here are some common usage summaries:1, the specified file or folder statistics, the default unit is KByte (k or kilobytes), the following example of the folder Testa statistics: [email protected] ~]$ du-s Testa1589308 Testa 2, the correct method of folder statistics, if you want to kno

Dbms_stats package Update, export, import, lock statistics

With the advent of the Dbms_stats package, we can collect statistical data for the CBO in a new way. The use of old-fashioned analyze analysis tables and dbms_utility methods to generate CBO statistics is no longer recommended. Dbms_stats can well estimate statistics (especially for larger partitioned tables) and get better statistical results, eventually making a faster SQL execution plan.--Create a stage

Oracle Automatic Performance statistics

Oracle Automatic Performance statistics?? Efficient diagnosis of performance problems, need to provide complete statistics available, like the doctor to the patient's palpation, to be able to correctly diagnose, and then prescribe the corresponding prescription. The Oracle database generates multiple types of cumulative statistics for systems, sessions, and indiv

The impact of SQL Server statistics on queries

Tags: SP strong data on BS time as database sqlThe optimizer chooses which execution plan is selected based on the extinction and is related to the row count statistics, which are automatically generated by default in the process of optimization.Once the column is marked for statistical information, the query optimizer looks for the statistics for that column, and if there is a statistic, the next step is t

Professor Zhang Zhihua: machine learning--a love of statistics and computation

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

SQL server-in-depth profiling statistics

Transferred from: http://www.cnblogs.com/zhijianliutang/p/4190669.html Conceptual understanding About statistics in SQL Server, as explained in Books Online Query optimization statistics are objects that contain statistics related to the distribution of values in one or more columns of a table or indexed view. The query optimizer uses these

Examples prove that Baidu statistics included in the is not accurate

You know, since Baidu launched the statistics, that has been our use of long-term site command was said to be inaccurate Baidu, you just use this site command Baidu, it in order to promote its own statistics tools Baidu, is this hint to this number is estimated value, webmaster, if you need to know more accurate collection, Please use Baidu statistics. I believe

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