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Library single TableLibrary single table is the most common database design, for example, there is a user table in database db , all users can be in the db library User found in the table. Library Multi-tableAs the number of users increases, the amount of data in the user table becomes larger, and when the amount of data reaches a certain level , the query to the user table slowly slows down, affecting the entire DB the performance. If you use MySQL, A more serious problem is that when you need

How to dynamically add menus/menu items, sub-menus, right-click menus, and menu item sub-menus Menu-related operations mainly use the CMenu class. Of course, the corresponding API functions are also available. The CMenu class is only the encapsulation of the function of the Operation menu in the API by MFC. However, if you can use a class, try to use the class. The class is well organized and the code looks

extension of the maximum sub-segment and classic problem. title Link: http://www.51nod.com/onlineJudge/questionCode.html#!problemId=1052 n integers consisting of a sequence of a[1],a[2],a[3],..., A[n], dividing the n number into disjoint m-sub-segments, and the largest of the M segments. If M >= the number of positive numbers in N, then the sum of all positive numbers is output. For example:-2 11-4 13-5

. I don't think it's good to have indexes on a database, but how do you improve the performance of queries if you don't build indexes?6: It's all a distributed database. Put it in more than one table, it's okay to associate directly. Important is horizontal slicing7: Recognition of sub-tables, sub-libraries, caching practicesReferenceProblem Analysis:Daily forum visits about 3 million, update posts around 1

Label: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 sub-table is to reduce the burden on the database and shorten the query time. one mechanism in MySQL is table locking and row

VI Chinese garbled characters -- VI Chinese garbled characters in LINUX -- general Linux technology-Linux technology and application information. For details, refer to the following section. In windows, the default mode is gb encoding, while in vim mode, the default mode is UTF-8 (gedit is also UTF-8 by default. Modified the configuration file so that vi supports

Vi replacement, vi In the vi editor, you can use the: s command to replace strings. The specific usage is as follows: 1.: s/str1/str2/replace str1, the first character string that appears in the line with string str2; 2. s/str1/str2/g: replace str1 with string str2; 3.:., $ s/str1/str2/g. Use string str2 to replace all the strings str1 from the current row to the

Vi editor introduction, vi editor IntroductionPart 1: Mode Three modes: Command mode (default mode), edit mode, and baseline command mode Command mode --> edit mode (I/o/a/r) Edit mode --> command mode (esc) Command mode --> baseline command (:) Baseline command --> command mode (esc) I, lowercase, insert at current position I, uppercase, insert at the beginning of the line A, lower case, insert after curre

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

Vi and vim Editor (13): Overview of Functions of similar vi Products They are all my brothers: There are many similar products of the vi editor that can be freely obtained. Vi and vim editor focuses on the vim editor and briefly introduces three other common similar products: nvi, elvis, and vile. These similar product

When the MySQL data volume is too large, it will face pressure decomposition, then the sub-database table is a good solution, and now we have to talk about how MySQL library sub-table is ideal, and then use PHP how to invoke.1, master-slave replication, read/write separationTo modify the data for the main library, the query is used from the library. A master multi-slave, to reduce the database read pressure

Master-Slave read-write separation, sub-database sub-table1. Vertical Slicing2. Horizontal segmentationSolutions are: Mysql-agent, TDDL, Amoeba, Cobar, Cobar client, Mycat, SHARDING-JDBCDatabase partition partitionResources:1. Analysis of the realization principle of horizontal segmentation of database----sub-library, sub