ucsc statistics

After a period of time, as the database object is modified, statistics must be collected regularly. To determine the database objects that require new database statistics, the oracle database provides After a period of time, as the database object is modified, statistics must be collected regularly. To determine the database objects that require new database

Use dbms_stats or analyze Since Oracle8.1.5 introduced the dbms_stats package, Oracle and experts have recommended dbms_stats to replace analyze. The reasons are as follows: 1. dbms_stats can be analyzed in parallel. 2. dbms_stats has the automatic analysis function (alter table monitor) 3. The analyze analysis statistics are sometimes inaccurate. The first, second, is easy to understand, and point 2nd is actually the most attractive in VLDB (Very Lar

?? To build a user behavior in line with their needs of the statistical system, I believe that many operators dream, but also the development of the technology of the persistent pursuit. Below, I share the user's behavior statistics system that we have built for the company.?? User behavior statistics (users Behavior Statistics, UBS) has always been an essential

1. IntroductionJstat is used to monitor the hotspot-based JVM for real-time command-line statistics on the use of its heap, and with jstat we can monitor the specified JVM as follows:-Loading and unloading of classes-View capacity and usage of new generation, Laosheng generation and durable generation-View the new generation, Laosheng generation and durable generation of garbage collection, including the number of garbage collected and the time taken

Data statistics for Oracle databases (ANALYZE) Oracle data Optimizer has two optimization methods: Based on cost/cost optimizer (CBO) and rule-based Optimizer (RBO), when the system optimizes the SQL, which optimization is used to determine the initialization parameter Optimizer_mode, The parameter value can be set to: Choose,rule,all_rows,first_rows. New tuning parameter commands are also introduced in later versions of Oracle9i: First_rows_1,first_r

Simple Website Traffic Statistics tool Of course, talking about the website traffic statistics, now open source also have, free also has, XX statistics, XX statistics, online casually can find, individual reason writes this tool, completely out of personal preference, as a "occupation" yards nong, in yards Nong's path

Tags: des style blog HTTP Io color ar OS usage In the previous article statistics-filtering index statistics expiration test, there is a problem left over. When the number of updated rows meets the automatic statistics update condition, what kind of queries will trigger automatic updates? Under the guidance of Lin Yong Hua, find the following two tracking sig

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

Baidu's two Webmaster-related products, Baidu Statistics and Baidu sharing, set off a wave at the launch. After the official launch of Baidu Statistics, the webmasters of major webmasters forums strongly reflected that all posts are full-screen and portal websites are competing Baidu's two Webmaster-related products, Baidu Statistics and Baidu sharing, set off a

I recently tried several traffic statistics tools and compared them roughly. I hope to correct them:163 traffic statistics: (not fully tested)Advantage: almost no advertisement is seen, and the page is cleanDisadvantages: 1. It is quite satisfactory, and there is no place to make a lottery2. After the installation, the webpage display speed is reduced, and browser alarms "block cookie sending"51Ye

This article describes a basic idea and implementation method for implementing Web data statistics and reports using ASP, and provides a solution for cleverly calling word printing reports. Key words: Asp, data statistics, reports, printing, word 1. Introduction With the rapid development of Internet, more and more business application systems are developed based on Web, such as office automation, E-Commer

Nearly a year has not been in the blog Park to write things, from the company has been working hard to learn the company's framework and business. Now take over an e-commerce data statistics project, in the blog Park Search statistics Project Solutions but nothing, and finally design and continue to develop in the process of continuous updating, I hope to communicate with you.DemandThe project group's e-com

Baidu Company in July last year High-profile publishing Baidu statistics This functional statistical service system, the system can help webmaster tracking every user in the enterprise website behavior, help webmaster Improve website Construction Tutorials and adjust the search promotion strategy. It is reported that Baidu has been committed to the webmaster needs of the understanding and research, with its strong technical team, Baidu