riverbed optimization

Text: Table design and optimization (true technical text)Optimize ①: Create normalized tables to eliminate data redundancyDatabase paradigm is a database design method that ensures reasonable database structure, satisfies all kinds of query needs and avoids abnormal database operation. To meet the formal requirements of the table, called the normalization table, the paradigm was generated in the early 1970s, the general table design to meet the first

2 Index and Query Optimization Index type Ø normal index: This is the most basic index type and has no restrictions such as uniqueness. Ø unique index: It is basically the same as a normal index, but all index column values are unique. Ø primary key: The primary key is a unique index, but must be specified as "primary key ". Ø full-text indexing: MYSQL supports full-text indexing and full-text retrieval from 3.23.23. In MYSQL, the full-text index type

Texture Optimization in Cocos2d-x optimization, cocos2d-x optimization texture1. Texture pixel formatAnother important indicator of texture optimization is the texture pixel format. To maximize the user's fidelity requirements, select the appropriate pixel format, this greatly improves the processing speed of textures.

Performance Optimization-database optimization and performance optimization database This article optimizes the performance of databases. The principle applies to most databases, including Sqlite, Mysql, Oracle, and SQL server,The index (advantages and disadvantages, categories, scenarios, rules) and transactions are introduced in detail. Finally, some optimizati

As we all know, the new station on-line, especially in the face of Baidu SEO optimization, many times we seem very powerless, because Baidu for the new station of the examination cycle is very long, the content quality is better than at least 1 months, the content of low quality three months may not enter the top 100, So I think the optimization Baidu must follow its relevant rules, the author recently opti

result set type returned by the subquery is a simple value. b) Single-row sub-query. The result set type returned by the subquery is 0 or one unit group. Similar to the scalar subquery, but may return 0 tuples. c) Multiline single-row subquery. The result set type returned by a subquery is a multi-tuple but has only one simple column. d) Table sub-query. The result set type returned by a subquery is a tabl

, distance distance, large map2. Scene: More style changes3, many people with screen4, there are many interactions(see here, UE + The above is directly said Fortress night is good Bai)(because of the length of the road, the path is opened directly, you crossing)Memory 2 Texturestreaming The UV scale factor of the corresponding map used in the screen size x material of the object bounds on the CPU x a scalar value that can be tweak by the fine art

IOS25 performance optimization, memory optimization, and ios25 Performance Optimization 1. Use ARC to manage memory ARC (Automatic ReferenceCounting, Automatic reference counting) and iOS5 are released together to avoid Memory leakage, which is often caused by memory loss. It automatically manages retain and release processes for you, so you don't have to interve

Optimization of Max ()For example: Explain select Max (' Payment_date ') from payment; The number of rows that can be viewed to row is very much, which means that the entire table is scanned.Add an index to payment_date.CREATE INDEX Idx_payment on payment (' payment_date ');Execute SQL statement explain select MAX (' Payment_date ') from payment order by Payment_date; You can see that rows is null.Extra:select tables optinized away;Does not scan the e

Here is mainly divided into table design optimization and SQL statement optimization two aspects to achieve.The first is table design optimization:1. Do not exceed 8020 bytes of data row length. If it exceeds this length, the data will take up two lines to reduce the efficiency of the query.2. Do not use a string type if you can use a numeric type. String types c

MySQL Optimization-InnoDB Optimization-mysql Optimization-innodb Learning Plans are easily interrupted, and persistence is not easy. We have recently held a meeting in the company. To adjust the business direction, we suggest learning NodeJS. I would have done a little before NodeJS, but I have not studied it in depth. The syntax of Node is basically the same as

Database optimization-SELECT optimization for SQL optimization-mysql internal optimization policy bitsCN.com Database Bottlenecks often occur in query statements. when such problems occur, the general step is to check whether the correct index is used, You can use the explain SQL statement to check the corresponding fi

NumberAnnotation of factor effective optimization factors1KeywordsKeywords in the URL first best, second, and so on, Chinese also useful2Keywords in the domain name3Title tags in the keyword not too long, 10-30 words within the best, do not use special characters, excessive optimization has penalties4Description tags in the same keyword not too long, within 100 words, over the

optimization scheme (http://www.cnblogs.com/huangye-dream/archive/2013/05/21/3091906.html) Viii. explain viewing index usage in SQLSince the index is important, but there is no index in the SQL execution process, this can be viewed using explain, using the method: Explain SELECT * FROM table_name; is to add explain before the SELECT statement.My local test explain SELECT * from w1000 where id = ' 0000c51e-0ede-4dc2-871a-78c1eebd0041 '; We can see tha

Android Optimization-UI optimization (2), android ui OptimizationUseincludeTag reuse Layout-1.includeFunctions of tags What should I do if I use this layout on many interfaces? If every page is written, the code is too redundant and the maintenance difficulty increases. I will use this layout aboveincludeLabels, code is obviously more neat, and the layout is more reusable, reducing the memory usag

Android Optimization-UI optimization (1), android ui OptimizationOptimize layout level 1. Avoid layout mosaic depth (as shown below) We can remove the id as follows:main_ll_duoyuThe LinearLayout of can also achieve the desired effect (the effect is as follows) 2. Use tools to view the Layout Tool Path Sdk \ tools \ hierarchyviewer. bat | double-click to open View Layout Comparison Now we

The RAND () Optimization Method for MySQL optimization and the rand Method for mysql Optimization As we all know, in MySQL, if order by rand () is used directly, the efficiency is very poor because it will be executed multiple times. In fact, this is also true if the equivalent query uses RAND (). Let's take a look at the different execution plans and execution t

Cocos2d-x Optimization in image optimization, cocos2d-x optimization picturesIn 2D games, images are undoubtedly the most important resource files. They are loaded into the memory and converted to textures, which are rendered by the GPU on top of the genie. It can be optimized in many aspects, including: image format, puzzle and texture format. Below we will intr

I used to optimize it.AlgorithmBut for most numerical optimization algorithms, local optimization is required. Global optimization is the convex problem on the Convex Set. Simply put, this type of problem is a local optimal solution. The Board is the best. The global optimization problem of multiple local extreme val

The speed of the website is a problem that many people are faced with, in fact, many sites, have not deliberately to optimize the speed of loading, for a site, acceleration not only improve the user experience (if a site in a few seconds did not open, most users choose to be closed rather than waiting), but also for the flow of SEO has a great impact, We can understand this: the speed of the Web site faster, the speed of the loading of the Web page, so that in the same time, search engine spider