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results of the database to query, that is, O (n*m) this is required. Instant sensory methodology is important ^_^.Simulation Scenarios Scenario 1 : Buyer Place Order 1, when browsing the product can obtain the store ID and the product ID, as for the shopping guide ID here we can be in a random form (need to determine how to obtain the Business Guide ID) 2, through the shopping guide ID to get the user information guide to get shopping guide data should be placed in that table. 3.

Label:MySQL Sub-Library sub-table schemeThis article turns from: here MySQL Sub-Library sub-table scheme 1. Why Divide the table: When the data of a table reaches tens of millions of, the time you spend querying is much more, and if you have a joint query, I think I might die there. The purpose of the

"Database" sub-Library sub-tableI. Horizontal sub-table: when there is too much data in a table, you can consider the horizontal table.A horizontal table is usually divided by a field in the table, such as by time, the data of each month is placed in a table, the name plus time to identifyHorizontal sub-table for the s

the article information in the 1~10000 into the article table in DB1, user_id all the article information in 10001~20000 into the DB2 table, and so on, until article. In this way, the article data is naturally divided into various databases, to achieve the purpose of data segmentation.The next problem to solve is how to find a specific database? In fact, the problem is simple and obvious, since the Sub-Library when we use the distinction between the

distribute such data to tables in different databases? We can do this by putting user_id all the article information in the 1~10000 into the article table in DB1, user_id all the article information in 10001~20000 into the DB2 table, and so on, until article. In this way, the article data is naturally divided into various databases, to achieve the purpose of data segmentation. The next problem to solve is how to find a specific database? In fact, the problem is simple and obvious, since the

Tags: Dependency core http Asynchronous Execution sub-database sub-table other ALT basic resultsI. OverviewWith the development of time and business, the data volume of the table in the database will be more and more large, correspondingly, the data operation, adding and deleting the cost will be more and more big. Therefore, some of these large tables are split into multiple tables in several databases.On

user_id all the article information in the 1~10000 into the article table in DB1, user_id all the article information in 10001~20000 into the DB2 table, and so on, until article. In this way, the article data is naturally divided into various databases, to achieve the purpose of data segmentation. The next problem to solve is how to find a specific database? In fact, the problem is simple and obvious, since the Sub-Library when we use the distinction

Test instructions: Given a matrix, find the largest and most large sub-matrices with a width of a and a length of B.Analysis: Direct use of the maximum and sub-matrix formula, but here is a more restrictive conditions, so in the sum of a little bit different, is not row by line and a column to seek, but each with a A, a, a span to seekDp[k]=mt[i][k]+....+mt[i+a][k], and then each time Sum=dp[k]+.....+dp[k+b

Navigation menu (move to show sub-menu), navigation menu sub-menuThe Code is as follows: Move the mouse over a menu on the webpage, and a row of sub-menus are displayed below Aspnet uses the menu Control for navigation to achieve horizontal menu, move the mouse over the menu item, and how does the xml of the sub-men

database reading and writing separation and vertical sub-Library, horizontal sub-table As the business of a website expands, data increases, the pressure on the database becomes larger, and the basic optimization of the database or SQL may not be the ultimate result, we can use a read-write separation strategy to change the status quo. Read-write separations are now heavily used in many large Web sites, an

Tags: Execution time thinking error etc script rom mkdir grepShare a MySQL sub-library backup script (original) Development ideas: 1. Path: Specify the location of the backup, the path (the first to determine whether there is no creation of a directory) first defined, my path:/mysql/backup, each backup with compression to improve efficiency, with time convenient to organize 2. Fetch the database: Fetch the database name, I use awk and grep to take the

Tags: MySQL database sub-Library sub-table backup scriptMySQL Database sub-Library sub-table backup script=================== students to share the sub-database sub-table ==========================The difference between a script s

, you need to determine what rules the table will use to divide the database into tables. For example, when a new user is available, the program has to decide which table to add this user information to, so when we log in we have to find the corresponding record in the database through the user's account, all of which need to follow a certain rule.RoutingThe process of finding the corresponding tables and libraries by using the Sub-Library table rules

First, the problem analysisIn the case of violent resolution, the total number of cases considering the sub-paragraph is 1+2+...+n=o (n^2). Considering the dynamic programming algorithm, the complexity of O (n) algorithm can be realized.Second, the program designIii. Results of the procedureIf the sequence is full of negative numbers, it is actually choosing the maximum valueGiven a sequence of n integers a1,a2,..., An to find the maximum value of the

\-dwith_readline=1 \-dwith_embedded_server=1 \-dwith_debug=0#--Build files has been written to:/home/oldboy/tools/mysql-5.5.32Tip, there are many options to configure at compile time, refer to the end of the appendix or official documentation:Make#[100%] Built Target my_safe_processMake installLn-s/application/mysql-5.5.32//application/mysqlIf there is no error in the above operation, the installation of the MYSQL5.5.32 software CMake mode is successful.1.3 After you install the database succes

Title Description: Hertz occasionally takes some professional questions to confuse students who are not computer Majors. Today JOBDU Test team after the meeting, he said Again: in the ancient one-dimensional pattern recognition, it is often necessary to calculate the maximum sum of continuous sub-vectors, when the vector is all positive, the problem is well Solved. however, If the vector contains a negative number, should it contain a n

Table is a good way to distribute the pressure of the database.Table, the most straightforward meaning, is to divide a table structure into multiple tables, and then, can be in the same library, can also be placed in different libraries.Of course, the first thing you need to know is how to divide the table. Individuals think that the number of single-table records to reach the million to tens the use of the table.Vertical Sub-tableThe content that wou

1 What is a sub-database tableThe situation discussed here is a database on a single machine.The object of a library is a table, and the object of a table is a row. The Sub-Library is about placing tables that are highly correlated to the same module in the same database. The table is to say that the rows of the same table are divided into multiple sub-tables, an

Tags: and database start COM question solution for HTTPS 1. mysql Sub-database sub-table scheme 1.1. Question: 1.2. Answer: 1.2.1. The best way to divide MySQL is: don't do it unless you have to. 1.2.2. Your SQL statement is no longer declarative (declarative) 1.2.3. You incur a lot of network delays. 1.2.4. Your time zone. Many of the powerf

Tags: MySQL sub-Library sub-table Oneproxy oneproxy Database middleware Instructions#wget http://www.onexsoft.com/software/oneproxy-rhel5-linux64-v6.0.0-ga.tar.gz# TAR-ZXVF oneproxy-rhel5-linux64-v6.0.0-ga.tar.gz-c/usr/local/# cd/usr/local/oneproxy/1 . Specifies the middleware-initiated Shell program directory location for scripts and startup files# sed-i ' s/^export.*$/export\ oneproxy_home=\/usr\/local\