udacity statistics

not NULL, PRIMARY KEY (' id ') ) Engine=myisam DEFAULT charset=gb2312 auto_increment=4; "; mysql_query ("DROP TABLE IF EXISTS '". $table _prefix. " Sp_count '; '); /delete already exists $sql =str_replace ("Spilder_", $table _prefix, $sql);//Replace Prefix if (mysql_query ($sql)) { echo "Table created successfully! Writing to File "; } $f =file_get_contents ("spilder_config.php");//Get Configuration content $f =str_replace ("", "", $f);//Remove spaces $f =preg_replace ("/mysql_host=

Today, a bug was found in the data pump import operation. Database version Oracle 10203 for Solaris RAC, performing import statistics in the processing table The times wrong, the error message is: ORA-39083 and ORA-917. After careful investigation, comparing the source database analysis and the target database table analysis, found that all the partition table statistics are not imported. The basic confi

Statistics Report The system provides a multi-angle of statistical reports, including inventory statistics, sales profit statistics, employee performance statistics. 1, enter the application desktop, click the "Statistical report" icon, or from the main Menu "statistical report" to select the corresponding report, as

Starting from 10 Gb, Oracle introduced a job to automatically collect statistics to ensure that the statistics in the data dictionary correctly reflect the Data Object status. This greatly relieves Starting from 10 Gb, Oracle introduced a job to automatically collect statistics to ensure that the statistics in the data

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

are very low.The database design problem, of course, is also very important, but for a few years of the system, tinkering is almost.For the coding problem, it is better to combine with the index, many times it is not an index problem, but your writing results in the optimizer does not use the index. In addition, if it is an index problem (no index, no index, no use, too many indexes, etc.), you can look at my other two index related articles:1. SQL Server Index Maintenance (1)--How to get Index

As a benchmarking platform in the field of mobile application statistics, flurry has a very comprehensive range of functions, not only for data statistics and analysis functions, but also for app Circle advertising and promotion platform functions. It can be said that flurry is currently the most comprehensive mobile application statistical analysis products, in addition to

For example, I want to make a statistics on the homepage, such as the number of articles, number of users, and the latest users. If I want to count from mysql every time, it will take up too much resources. so how do I occupy less resources? Do I need to create a table for statistics? What are the solutions? For example, I want to make a statistics on the homepag

Common SQL sorting, grouping, and statistics statements: 1. Sort data in order. Generally, all you really need is to sort data in a certain order. The ORDERBY Statement of SQL can organize data in alphabetical or numerical order. Therefore, similar values are sorted by group. However, the sorting results of this grouping are not true grouping. ORDERBY Common SQL sorting, grouping, and statistics statements:

EXP-00091 Exporting questionable statistics may be frequently encountered in our EXP process for Oracle. in fact, it is the exp error message, which is generated because the environment variable where our exp tool is located is inconsistent with the NLS_CHARCATERSET in nls lang. But it should be noted that the EXP-00091 error has no impact on the generated dump file, the generated dump file can also be normal imp. Next we will solve this problem so th

Today, the customer reported that the query was slow. Because the query was in a production environment, the test was not allowed. Therefore, refer to the following blog to export the statistics to the test server for SQL statement optimization.1. Create a storage statistics tableEXECUTE DBMS_STATS.CREATE_STAT_TABLE ('Scott ', 'stattab', 'sysaux ');Create stattab on the sysaux tablespace to store

Recently, Twitter developed a distributed real-time statistics system, Rainbird. Usage Rainbird can be used for real-time data statistics: 1. count the number of clicks on each page and domain name on the website 2. Internal System Operation Monitoring (count the running status of the monitored server) 3. Record the maximum and minimum values Performance Requirements As a distributed app

Atmadm The connection and address of the monitor registered by the ATM Call Manager on the asynchronous transmission mode (ATM) network. You can use atmadm to display the statistics of incoming and outgoing calls uploaded by the ATM adapter. If this parameter is not included, atmadm displays statistics on the status of active ATM connections. SyntaxAtmadm [/C] [/A] [/S] Parameters/CDisplays call infor

Statistics By extracting samples from the population to construct appropriate statistics, the sample function of the population is inferred from the sample nature. Common statistics 1) average sample value 2) sample variance and standard deviation 3) coefficient of variation of samples-c = root code (d (x)/E (X) 4) K Degree 5) center distance 6) Sample sk

When I use the "database engine optimization consultant" of sqlserver2008 to optimize an SQL statement today, the following suggestions are provided in the index recommendations:-- Create statisticsCreate statistics [_ dta_stat_1758629308_16_10_1] on [DBO]. [prmorderpromisetime] ([distributionid], [storeid], [orderid]) -- Include IndexCreate nonclustered index [_ dta_index_prmordersiteactualtime_6_1582628681 _ k1_2_7] on [DBO]. [prmordersiteactualti

To view the number of IIS connections, you can use "website statistics" to view the number of IIS connections. The current number of online users in "website statistics" can be considered as the number of current IIS connections. However, the current online statistics of "website statistics" takes a long time, generall

Arcgis for JS extends GraphicLayer to achieve clustering statistics and display of regional objects. arcgisgraphiclayer Functional requirements: Provincial and municipal statistics show the number and location of the national rainfall stations. General Practice: The number of provincial and municipal rainfall stations is displayed on the page through a statistical table. The positions are marked on the map

streaming server deployment structure brings up the following issues:1 due to the high cost of the core network, the traffic expense of the source media server is higher;2 Intermediate multistage Streaming Media server increases the end-to-end delay, Reduced user experience;3 backbone network core room is stable, but the distribution of the national media Stream publishing end with the network quality is not necessarily the fastest . In order to overcome these problems, this paper proposes a me

Weekend want to statistics xcl-charts exactly how many lines of code, the go language to write a code statistics tool, the effect is good, statistical speed is also fast.The statistical report part of the perfect today, abruptly the very short code Peng rose to more than 200 lines.In addition to the required number of lines of code and file totals, the number of code files with 300,500,1000,5000 and more th

Program | design | statistics | online | When browsing the Web, you can often see a number of online numbers of people on the current site who are xxx. How to use ASP to do one? First of all, the analysis of its practice, in general, these online statistics refers to the number of visitors in a period of time statistics. For example (within 5 minutes, 10 minutes)