MySQL

The first is the problem encountered during the installation of CMake:1. Start using the Yum command when installing, do not know why not always, then prepare wget to download the compressed package, and then manually compiled. Due to network

Today, the original MySQL garbled problem, the past is always a hasty solution to forget. I can't stand it this time. Every time it was a change of a daze. This decision to explore a good, read a lot of information and blog after understanding the

database files in normal data directory as long as table structure file frm file ... I know what I'm doing after I dig.MySQL's default database engine mode is set to InnoDB.The InnoDB table has no myd and. MYI, and its data file corresponds to the

1. List all the character sets supported by MySQL:SHOW CHARACTER SET;2. Current MySQL server character set settingsSHOW VARIABLES like ' character_set_% ';3. Current MySQL server character set checksum settingsSHOW VARIABLES like ' collation_% ';4.

1. What is a transactionA transaction is a combination of one or more database operation statements with acid,4 characteristics.Atomicity: Either all succeeds or all is undoneIsolation: Transactions are independent from one another and are not

Today's new start of the project in the database design, found that they are not familiar with the varchar type of MySQL, so the online collection of data collated as follows. Variations of the 1.varchar typeThe maximum length of the MySQL

what is a storage engine? Relational database tables are data structures for storing and organizing information, and you can interpret tables as tables of rows and columns, similar to the form of spreadsheets in Excel. Some tables are simple, some

Recently learning MySQL, the installation environment is a Windows Server 2003 32-bit operating system +mysql 5.1.47mysql command line and MySQL Workbench are also installed.This is the test database.CREATE TABLE fortest (empno int

MySQL master-slave replication is believed to have been used a lot, but because of the work of the reason has not been used. While this period of time is relatively idle, it will be realized again. Although there are a lot of similar articles on the

MySQL main master sync server buildInstall the database first here is the mysql5.6.15 version of the[Email protected] ~]# RPM-UVH mysql-*.rpmPreparing ... ########################################### [100%]1:mysql-devel ###############################

MySQL relational database management systemMySQL is a relational database management system , developed by the Swedish MySQL AB Company, is currently owned by Oracle Corporation. MySQL's most popular relational database management system, MySQL is

In the third edition of High-performance MySQL, the evaluation of indexes is mentioned: Samsung Evaluation (Three-star system).In the original English version of "High Performance MySQL (3rd Edition)" The third edition is: The index earns one star

Installing MySQL on Ubuntu is very simple and requires just a few commands to complete.1. Sudo apt-get install mysql-server 2. Apt-get Isntall mysql-client 3.sudo apt-get install Libmysqlclient-devDuring installation, you will be prompted to set a

PhpMySQL inserts more than one data Inserting multiple data into MySQL using MYSQLI and PDOThe Mysqli_multi_query () function can be used to execute multiple SQL statements.The following instance adds three new records to the "myguests"

Read-uncommitted (read not submitted)Testing process:1, a set read-uncommitted, start transaction2, b Execute Start transaction, modify a record,3, a query record, got the correct record4, b rollback.Problem: A reads a record of B without committing,

The premise is that the previous database data must be retainedBefore introducing this method, it is advisable to remind you that the best way to transfer data is:Export the SQL file in the original MySQL server, and then import the data in the new

Basic Concepts• The character (Character) refers to the smallest of the ideographic symbols in the human language. such as ' A ', ' B ' and so on;• Given a series of characters, each character is given a numeric value that represents the

PHP Configuration1. Configure Disable_functionDisable_functions = Eval,assert,popen,passthru,escapeshellarg,escapeshellcmd,passthru,exec,system,chroot,scandir ,

[Blog recommendations] use shell scripts to automate Database Backup This blog post is from the Bkjia blogger Lemon. If you have any questions, go to the blog page for an interactive discussion!Blog: http://maomaostyle.blog.51cto.com/222

MySQL MIN () function usage tutorial, mysqlmin MySQL MIN function is used to find the minimum value of a record set. The EMPLOYEE_TBL table for MIN functions has the following records: mysql> SELECT * FROM employee_tbl;+------+------+------------+---