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Designing an application system does not seem difficult, but it is not easy to optimize the system performance. In the development of tools, database design, should There are multiple options for application structure, query design, and interface selection, depending on the specific application requirements and the skills of the development team. This document uses SQL Server is used as an example to discuss application performance optimization techni

calculates a field of view for the connection, and then loops the players on the entire map when the broadcast is required, find players whose coordinates are within their field of view. The advantage of using this method is that a large amount of messages need to be broadcast at one time when there is no conversion block. The disadvantage is that players on the whole map need to traverse when calculating the broadcast object, if there are too many players on a map, this operation will be slow.

SQL Server date calculation Generally, you need to obtain the current date and calculate some other dates. For example, your program may need to determine the first or last day of a month. Most of you probably know how to divide a date (year, month, day, and so on ), then, just use the split year, month, and day to calculate the date you need in several functions! In this article, I will show you how to use the DATEADD and DATEDIFF functions to calcul

end; otherwise, it will make you depressed.@ SortType INT, -- sorting Rule 1: Forward asc 2: reverse desc 3: Multi-column sorting method@ RecorderCount INT, -- total number of records 0: the total number of records is returned.@ PageSize INT, -- number of records output per page@ PageIndex INT, -- current page number@ TotalCount int output, -- Record total returned records@ TotalPageCount int output -- tot

at the end; otherwise, it will make you depressed.@ SortType INT, -- sorting Rule 1: Forward asc 2: reverse desc 3: Multi-column sorting method@ RecorderCount INT, -- total number of records 0: the total number of records is returned.@ PageSize INT, -- number of records output per page@ PageIndex INT, -- current page number@ TotalCount int output, -- Record total returned records@ TotalPageCount int output

SQL statement test in mysql. The execution time is very short, so this is not the biggest bottleneck. Finally, during the page generation process, we found that the Program executed several master table (dede_archives) queries and retrieved operations that meet a set of complex query conditions. The query efficiency was very low, it affects efficiency! Through debugging tracking, we have located the key to the problem. The culprit is the arclist tag in the template. The Arclist label is a favor

section Serv-u installation and basic settings First, installation Expand the compressed file "Servu3b7.zip", perform the "setup.exe" in it, start the installation, and select all the default options. After the installation is complete without restarting, you can see the relevant files directly in the start → program →serv-u FTP Server. The following figure: Second, the establishment of the first available FTP

contents of the servlet in the previous version of the Web. xml file in Servlet3.0:The functions of the two styles are the same, but it is easier and more efficient to configure the annotations after Servlet3.0. Speaking in fact, the Doget method in the Firstservlet we created above is as follows:protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException { Response.getwriter (). Append ("\ n Initialize parameter UserName =" + Getinitpara

Learning node (2) from 0 to 1 and building an http server During the course of the previous section, we learned about the connection and differences between different module specifications. In this section, we officially started learning about node. First, we started from setting up an http server and running simple p

matter what the situation is ", microsoft even has an article in KB about how to restore a database only by using log files. I really don't know what I thought at that time ?!This is broken! The database cannot be connected, and the enterprise manager says "(doubt)" next to it )". And the most terrible thing is that this database has never been backed up. The only thing I can find is another database server that was migrated six months ago. The appli

ensure the existence of database log files no matter what the situation is ", microsoft even has an article in KB about how to restore a database only by using log files. I really don't know what I thought at that time ?!This is broken! The database cannot be connected, and the enterprise manager says "(doubt)" next to it )". And the most terrible thing is that this database has never been backed up. The only thing I can find is another database server