MySQL

When you operate MySQL in C #, the data inserted in Chinese is garbled, only the question mark is displayed, and the database itself uses the Utf-8 characterThere are two ways to solve this problem:One is set in front of the execution statement,

SELECT * FROM table where to_days (dateline) = To_days (now ());SELECT * FROM table where date (dateline) = Curdate ();--Query yesterday recordsSELECT * FROM table where to_days (dateline) = To_days (now ())-1;SELECT * FROM table where date

1. Authorization for all UsersGRANT all privileges on * * to ' user name ' @ '% ' identified by ' password '2. Database-based operations(1) Login MySQL database: mysql-u root-p, enter the password before entering(2) View all databases: show

1, in fact, a very simple point to note is, do not abuse -The database does have a lot of things to do, but it's easy to get into the database by doping business logic, which is a bit less maintainable. Because the intermediate data can not be

1. Stored procedures with no parametersDELIMITER $$ -- creating terminator Create PROCEDUREBEGIN SELECT* from users; -- SQL statements, be sure to end with; END $$ DELIMITER; -- Restore Terminator Call Proce1 -- calling a stored

You see this article from HTTP://WWW.CNBLOGS.COM/AYANMWThe PHP code is simple:$server = "127.0.0.1";p rintln ("Begin"), $link = mysql_connect ($server, "MySQL", "MySQL"), if (! $link) {die (' Could Not connect: '. Mysql_error (). Mysql_errno ());}

The system environment is CentOS 6.5 64-bitFirst add 3306 ports inside the firewall:650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/54/12/wKiom1R268HTLup6AAHmX55iVUk276.jpg "title=" QQ picture 20141127151904.png "alt="

When there is no double write attributeAfter the data is updated, the dirty page is placed in the InnoDB buffer cache. The checksum value of this page changes.The head fileheader section of the page has a checksum entry, named

First, xtrabackup backup recovery principleWhen you back up the InnoDB table, xtrabackup several threads to copy the. ibd file for a stand-alone tablespace, and constantly monitor the changes in the redo log in this process and add it to your own

The first is to determine the mysql_connect() mysql_pconnect() problem, the fault phenomenon is that the function returns NULL, and mysql_error() returns "No such file or directory". Write a phpinfo page, find mysql.default_socket ,

First1. Buffer poolThe InnoDB storage engine is disk-based and manages the records in it as a page. Buffer pools are typically used to improve the overall performance of the database. The buffer pool is simply a piece of memory, which compensates

Library single TableA library single table is the most common database design, for example, a user table is placed in database db, and all users can be found in the user table in the DB Library. Library Multi-tableAs the number of users increases,

The following steps run the environment is centos6.51. Find out if MySQL was previously installedCommand: Rpm-qa|grep-i MySQL2. Delete MySQLDelete command: RPM-E--nodeps package Name3, delete the old version of MySQL development header files and

mysql> show global status; Can list MySQL server running various status values, my personal preferred usage is show status like ' query value% '; One, slow query mysql> show variables like '%slow% '; +------------------+-------+ | variable_name

Demand: 1, backup MySQL data at 4 points per day; 2, in order to save space, delete more than 3 months of all backup data; 3, delete more than 7 days of backup data, retain 3 months of 10th number 20th number 30th of the backup data; #创建shell文件vim

Question 1. Chinese garbled problemConnection string has been set Charset=utf8, but still garbled, workaround: Configure string field Conventions support Unicodeprotected Override void onmodelcreating (Dbmodelbuilder modelBuilder) {

What is the difference between MySQL index type normal,unique,full text? Normal: Indicates normal index Unique: Represents a unique, not allowed duplicate index, if the field information is guaranteed not to be duplicated such as a social security

How to Implement orderby in mysql Order by clsesIn general, the optimizer will skip the sort procedure for the order by clause if it sees that the rowsWill be in order anyway. But let's examine some predictional situations. For the query:SELECT

Transactiontimedout: deadline problems caused by the RUNNING status of MySQL transactionsPreface:A friend said that a simple query caused the Transaction timed out: deadline problem. It is suspected that the database table is locked,1. Deadline:---

MySQL security issues, mysql garbled issues When using MySQL, you must pay attention to security issues. The following are 23 notes for MySQL:1. If the connection between the client and the server needs to span and pass through an untrusted network,