sjsu statistics

A: Knowledge supplement (this HashMap map and C + + map is still a big difference, the difference between the big people jaw-dropping, of course, the role of the two is consistent, but the function name is very large, even iterator difference is very large)(1) difference between HashMap and Hashtable (only map wood in C + + is HashMap)HashMap is not thread-safeHastmap is an interface that is a sub-interface of the map interface, an object that maps keys to values, where the keys and values are o

First: Using the Application object (or ServletContext object) for statistics, the effect is that every time the page is entered once.Because the general Statistics page traffic, refresh is not counted in the statistics, here is this shortcoming. Second: Using application objects and session objects to count,The principle of this method is to access the browser f

awk Statistics IP Access times Now there is a file, the amount of data in the 200多万条 record, want to use the shell of awk to do statistics, the file format is as follows#关键字 #url#ip Address #Test|123|1Test|123|1Test|123|2Test2|12|1Test2|123|1Test2|123|2Now want to count the result is: see the same keyword and URL the total number of visits, as well as how many different IP, output to a fileSQL implementati

complete. There are minor changes in the previous HTML file. Put all the All changed to If you're recording clicks, these are basically enough. But the results of this record need to be downloaded to know, it seems a bit too primitive. So the following is also added to the function of online statistics. The program used for statistics should be able to arrange records in ascending or descending order, sho

Some statistical data on the server: 1) Statistics 80 port connection number Netstat-nat|grep-i "|wc-l" 2) Statistics HTTPD Protocol connection number Ps-ef|grep httpd|wc-l 3), the statistics are connected, the status is "established Netstat-na|grep established|wc-l 4), find out which IP address is the most connected, it closed. Netstat-na|grep Es

Traffic | Statistics using ASP to write a simple daily flow, maximum daily flow statistics ----------------------------------------------------------------------------- ' #########-statistics today, maximum daily flow-########## Sub My_today_counter () Day1 = CStr (date ()) ' ######-get current date Day_counter_file = Server.MapPath ("Counter/day_counter.ini")

Label:Jobs: Site Statistics 　　1, record the user's access information to the file, exclusive line, record the IP address 1PHP2 //Site Statistics 3 Header(' Content-type:text/html;charset=utf-8 '); 4 5 //Get user Information 6 $ip=$_server[' REMOTE_ADDR ']; 7 8 //Write file (append) 9 file_put_contents(' Record.text ',$ip." \ r \ n ", file_append); 　2. All information is calculated by the conte

Recently wrote a few about the "project-subitem-task" management system, said the system is still a little exaggerated, basically is a multi-table query call and INSERT, update database operation, but there are a lot of computational and statistical problems, making SQL appear complex. Therefore, it is necessary in a phase after the completion of the task, do a summary, some of the test process of SQL code to summarize, in case later use and forget, but also welcome you db yards together spit gr

Create an experiment table and insert 100,000 rows of dataSql> CREATE TABLE Test (ID number,name varchar2 (10));Table created.Sql> DeclareBeginFor I in 1..100000 loopINSERT into test values (1, ' a ');CommitEnd Loop;End/PL/SQL procedure successfully completed.Sql> commit;Commit complete.View statistics for a table, empty statisticsSql> Select table_name, Num_rows,blocks,avg_row_len from User_tables where table_name= ' TEST ';TABLE_NAME Num_rows BLOCKS

(area_code, ' total ') area_code,sum (local_fare) local_fare From T GROUP BY rollup (NVL (area_code, ' total ')); SQL code Select Area_code,bill_month,sum (local_fare) local_fare From T Group by Cube (Area_code,bill_month) Order by Area_code,bill_month nulls; SQL code Select Decode (Grouping (Area_code), 1, ' All area ', To_char (Area_code)) Area_code, Decode (Grouping (bill_month), 1, ' All month ', Bill_month) Bill_month, SUM (local_fare

11i-12 Gather Schema Statistics fails with Ora-20001 errors after 11G database Upgrade (document ID 781813.1) Go to bottom In this Document Symptoms Changes Cause Solution

Because many VPS or server are limited traffic, but many service providers do not provide a detailed flow chart, such as daily traffic table, so it is certain that some people would like to know how much traffic on their servers.Vnstat is a very useful server traffic statistics command. I'll get a few pictures to show you.Statistics days and month of statistics:is not very intuitive. Let's take a look at how this command is used. Estimated is the mean

When using indexes to query data, the optimizer determines whether to perform index scanning or index search based on the statistics related to the index. However, the statistical step size cannot exceed 200 (the third part of the result returned by DBCC show_statistics). This makes the accuracy of statistical information increasingly inaccurate in tables with a large amount of data. Of course, this impact will not be fatal, and there will be very few

Linux disk space size statistics du command common usageIn Linux, you can collect statistics on the space occupied by a file or folder. Here we will summarize some common usage as follows: 1. Make statistics on the specified file or folder. The default unit is kbyte (k or kilobytes). In the following example, perform statisti