如何快速学习bootstrap bootstrap中文网 http://www.bootcss.com/ 解决了我所有使用bootstrap的问题,从0开始,下面的全部链接都是该网站的子链接。 例子 http://v3.bootcss.com/examples/theme/ 解决了我按钮、panel(面板)、警告提示(该链接在http://v3.boo
如何快速学习bootstrapbootstrap中文网
http://www.bootcss.com/
解决了我所有使用bootstrap的问题,从0开始,下面的全部链接都是该网站的子链接。
例子
http://v3.bootcss.com/examples/theme/
解决了我按钮、panel(面板)、警告提示(该链接在http://v3.bootcss.com/getting-started/中)
jQuery API
http://jquery.bootcss.com/
解决了我滑动显示、滑动隐藏
组件:
http://v3.bootcss.com/components/
暂时还没用到
如果是2.3.2版本:
http://v2.bootcss.com
暂时还没用到
说明事项:
1、如果是刚开始,可以直接用3.3.2版本当然,2.3.2可能会对老的浏览器支持有点不同);
2、文档就是网站上的,我没找到可以下载pdf或者chm的地方;
3、基本打开例子,看着源代码就知道怎么用了;
4、如果你英文好,完全可以访问http://getbootstrap.com/,内容和v3.bootcss.com是一样的,也有getting-started、CSS、组件、例子;至于jQuery API(在bootcss首页里)不属于bootstrap里,因此没有;如果你英文不好,当然直接看中文网(bootcss)是最快的;
本文出处:http://blog.csdn.net/ouyida3/article/details/43992121
2015.2.28
InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB

MySQL/InnoDB supports four transaction isolation levels: ReadUncommitted, ReadCommitted, RepeatableRead and Serializable. 1.ReadUncommitted allows reading of uncommitted data, which may cause dirty reading. 2. ReadCommitted avoids dirty reading, but non-repeatable reading may occur. 3.RepeatableRead is the default level, avoiding dirty reading and non-repeatable reading, but phantom reading may occur. 4. Serializable avoids all concurrency problems but reduces concurrency. Choosing the appropriate isolation level requires balancing data consistency and performance requirements.

MySQL is suitable for web applications and content management systems and is popular for its open source, high performance and ease of use. 1) Compared with PostgreSQL, MySQL performs better in simple queries and high concurrent read operations. 2) Compared with Oracle, MySQL is more popular among small and medium-sized enterprises because of its open source and low cost. 3) Compared with Microsoft SQL Server, MySQL is more suitable for cross-platform applications. 4) Unlike MongoDB, MySQL is more suitable for structured data and transaction processing.

MySQL index cardinality has a significant impact on query performance: 1. High cardinality index can more effectively narrow the data range and improve query efficiency; 2. Low cardinality index may lead to full table scanning and reduce query performance; 3. In joint index, high cardinality sequences should be placed in front to optimize query.

The MySQL learning path includes basic knowledge, core concepts, usage examples, and optimization techniques. 1) Understand basic concepts such as tables, rows, columns, and SQL queries. 2) Learn the definition, working principles and advantages of MySQL. 3) Master basic CRUD operations and advanced usage, such as indexes and stored procedures. 4) Familiar with common error debugging and performance optimization suggestions, such as rational use of indexes and optimization queries. Through these steps, you will have a full grasp of the use and optimization of MySQL.

MySQL's real-world applications include basic database design and complex query optimization. 1) Basic usage: used to store and manage user data, such as inserting, querying, updating and deleting user information. 2) Advanced usage: Handle complex business logic, such as order and inventory management of e-commerce platforms. 3) Performance optimization: Improve performance by rationally using indexes, partition tables and query caches.


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