d sub interface

Reprint a blog, there are a lot of knowledge and ideas worthy of our thinking.——————————————————————————————————————————————————————————————————————In large-scale Internet applications, with the increase of the number of users, in order to improve the performance of the application, we often need to carry out database sub-table operation. In the single table era, we can rely entirely on the database's self-increment ID to uniquely identify a user or d

Label:1, sub-database sub-tableObviously, a main table (that is, very important tables, such as user tables) unlimited growth is bound to seriously affect performance, sub-library and sub-table is a very good solution, that is, the performance optimization approach, now the case is that we have a 1000多万条 record of the

Python: re. sub () second parameter, pythonre. sub Origin: The problem is caused by parsing the website kissanime. io.This video page will have a 5-second delay and submit a form for verification to prevent ddos attacks. The Form Verification is the following html code: Evaluate the jschl-answer value and use a piece of js Code. The js Code is randomly generated as follows: var s,t,o,p,b,r,e,a,k,i,n,

Maximum sub-array product algorithm and sub-array product Algorithm Returns an array a and returns the product of the maximum subarray. Algorithm idea: use dynamic sequence planning. Use maxValue (n) to represent the maximum sub-array product from 0 to n, and minValue (n) to represent the minimum sub-array product from

Tags: mycat sub-Library sub-table reading and writing separation master-slave switchingMycat and MySQL instance deployment scenarios:Mycat:ip:10.20.8.57,port:3310/3311Mysql:db1-m1,ip:10.20.8.126,port:3306db1-m2,ip:10.20.8.126,port:3307db2-m1,ip:10.25.80.7,port:3307The architecture diagram is as follows:Configure MycatServer.xml: Schema.xml: Modify the following configuration items in Rule.xml:The meanings

Label:MySQL Sub-Library sub-table "Turn" Http://blog.itpub.net/29254281/viewspace-1819422/MySQL the scheme of processing large-scale business data is generally a sub-database.Vertical splits are generally selected at the beginning.such as e-commerce website, may be in accordance with household appliances, books, mother and child and other commodity classification

1.mysql Sub-Library backupMyuser=rootmypass=yzg1314520Mycmd= "Mysql-u$myuser-p$mypass"mydump= "Mysqldump-u$myuser-p$mypass"For database in MySQL testDo$mydump $database > $database _$ (Date +%f). sqlTAR-ZCVF $database _$ (date +%f). tar.gz $database _$ (date +%f). sqlRM-RF $database _$ (date +%f). sqlDone2.mysql Sub-database sub-table backupMyuser=rootmypass=yzg1

The sub-database, as the name implies, is stored in a library of a table of data chunked stored in multiple libraries on several tables. For large-scale Internet applications, when the amount of data in a single table reaches tens of millions, the database spends more time per query, and the database faces very high concurrent accesses. through the Sub-database table, so that the data evenly distributed acr

For large-scale Internet applications, the amount of data in a single table can reach tens of millions or even billions of dollars, while facing this high level of concurrency pressure. Master-slave structure can only extend the read ability of the database, write operation or centralized in master, Master does not have the unrestricted hook slave Library, if need to further expand the throughput capacity of the database, you can consider the strategy of using the

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

:192.168.3.101Master_user:affairlogmaster_port:3306Connect_retry:60master_log_file:mysql-bin.000087read_master_log_pos:106relay_log_file:vm111-relay-bin.000002relay_log_pos:251relay_master_log_file:mysql-bin.000087Slave_io_running:yesSlave_sql_running:yesReplicate_do_db:yyyReplicate_ignore_db:mysql,information-schemaReplicate_do_table:Replicate_ignore_table:Replicate_wild_do_table:Replicate_wild_ignore_table:last_errno:0Last_error:skip_counter:0exec_master_log_pos:106relay_log_space:406Until_con

(i) Key issues1. Read and write separation2. Sub-database sub-table3. Categories LIB Library 1) business directly to the database, less a layer of proxy more efficient2) Single point problem with LVs without proxy Proxy 1) Unified management of all connections to the database, connection multiplexing2) Basic Query function abstraction, reduce code coupling3) Easy to implement mon

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

certain restrictions on business Cross-Library Association queries are not supporteda systematic analysis of the sub-list and application needs of the libraryA simple summary is that, with vertical expansion, only a short time to solve the problem, because of its increased performance is ultimately a limit, so it is not the ultimate solution, and the level of expansion is almost unlimited scalability, but the design capabilities of designers have req

certain restrictions on the businessCross-Library Association queries are not supported A systematic analysis of the sub-list and application needs of the library A simple summary is that, with vertical expansion, only a short time to solve the problem, because of its increased performance is ultimately a limit, so it is not the ultimate solution, and the level of expansion is almost unlimited scalability, but the design capabilities of designers h

time. Sub-database table rulesWhen designing a table, 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 tabl

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