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When we design the database table structure, we need to pay attention to the performance of the data operation when we operate the database, especially the SQL statements when we look at the table. Here, we're not going to talk too much about

If you want to do a Java EE development on Linux, first build the Java EE development environment, including the JDK, Tomcat, Eclipse installation (this in a previous essay has explained in detail the Linux learning CentOS (vii)- CentOS under the

Original link: http://www.cnblogs.com/xiaoluo501395377/archive/2013/04/07/3003278.htmlWhen it comes to databases, we mostly think of relational databases, such as MySQL, Oracle, SQL Server, and so on, which are very easy to install on Windows, and

In database tables, using indexes can greatly improve query speed. Suppose we create a testindex table:CREATE TABLE Testindex (i_testid INT not null,vc_name VARCHAR () notnull);We randomly inserted 1000 records into it, including a i_testid vc_name 5

Transactions are required to meet 4 conditions (ACID): atomicity (autmic), consistency (consistency), isolation (isolation), persistence (durability)Atomicity (autmic): The transaction is in execution, to do "either do it or do it all!" ", which

MySQL is prone to garbled problems when porting data containing Chinese. Many of them appeared when transplanted from mysql4.x to mysql5.x. The default character set for MySQL is Latin1, and many people use the latin1 character set when using mysql4.

If an on duplicate key update is specified at the end of the INSERT statement, and the row is inserted to cause duplicate values in a unique index or primary key, update is performed on the row where the duplicate value occurs, and if the unique

First, MySQL IntroductionWhen it comes to databases, we mostly think of relational databases, such as MySQL, Oracle, SQL Server, and so on, which are very easy to install on Windows, and if you want to install a database on Linux, I have to

It cost me a lot of time to solve garbled characters!Garbled reason has1.mysql not set to support kanji2. No header information sent3. The compiler used does not conform to the appropriate encodingThe solution isIn MySQL.I'm using Wanmp Server.1.

Suppose you want to do a Java EE development on Linux. First of all, we must set up the development environment of Java EE. Includes the installation of JDK, Tomcat, eclipse (this has been explained in a previous essay on the Linux learning CentOS

Recently in the collation of the database of slow SQL, but also query the relevant information. Record, learn to use the execution plan to analyze SQL.1. Optimize your query for query cachingMost MySQL servers have query caching turned on. This is

http://blog.chinaunix.net/space.php?uid=374372&do=blog&id=3085009Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the

First, MySQL introduction MySQL is a relational database management system developed by the Swedish MySQL AB company, currently owned by Oracle Corporation. MySQL is an associated database management system that keeps data in separate tables rather

How to upgrade the MySQL under CentOS 6.5The CentOS 6.5 comes with MySQL 5.1 installed, but 5.1 has a lot of limitations, and in practice we've already used MySQL 5.6, which causes some scripts to execute in MySQL 5.1 with an error. We can only

I. What is an index?Indexes are used to quickly look for records with specific values, and all MySQL indexes are saved as B-trees. If there is no index, MySQL must start scanning all records of the entire table from the first record until it finds a

Http://www.cnblogs.com/xiaoluo501395377/archive/2013/04/07/3003278.htmlIf you want to do a Java EE development on Linux, first build the Java EE development environment, including the JDK, Tomcat, Eclipse installation (this in a previous essay has

Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's

In the database select * into outfile '/home/mysql/data.sql ', MySQL also hints error: ERROR 1 (HY000): Can ' t create/write to file '/home/mysql/data.sql ' (errcode:13) Permissions error (ERRCODE:13) workaround1 to see if the

People: I: Not getting Started Linux rookieBrother Fat: TeacherStory:Brother from the script since the advocating through scripting to learn the deployment of various services, the pros and cons of the party through the script Automation deployment

Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's