MySQL

() function to get the length of a string:Select Length (' ABCDEFG '), Length (' 0123456789 ');/*+-------------------+----------------------+| Length (' ABCDEFG ') | Length (' 0123456789 ') |+-------------------+----------------------+|              

MySQL itself does not have built-in functions to remove HTML code, but in some cases it has to extract some plain text from the database hierarchy that removes the HTML code. After Google, found the following two functions, tested, are available.

Small and medium site simple backup policy The small and Medium line Web site based on Drupal, we can use the Backup_migrate module, which provides the function of regular backups, the time of backup, how many backups to keep, and so on, Once you'

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One, slow query log configuration Turn on the slow query log to configure the sample: /etc/mysql/my.cnf[Mysqld]Log-slow-queries Add the above configuration entry in the MY.CNF configuration file and restart the MySQL service, when the MySQL slow

Often see a user to ask some about PHP and XML, database combination of the use of posts, but also often see some beginners Mix the PHP code with the HTML code, and then when the error can not find the error, the rush, I will give a big Home about

If you specify on DUPLICATE key UPDATE and the insert row causes duplicate values to occur in a unique index or primary key, the Row old row update. For example, if column A is defined as unique and contains a value of 1, the following two

See: http://blog.yemou.net/article/query/info/tytfjhfascvhzxcyt336A real number is one with a fractional part. However, they are not just for storing fractional parts, but they can also be usedDeclmal stores an integer larger than the bigint. MySQL

1. Question:An error occurred while testing the php7.0 link MySQL database:Fatal error:uncaught error:call to undefined function mysqli_connect ()Even if you put a line in/etc/php/7.0/apache2/php.ini:;extension=php_mysql.dllModify to (that is,

For MySQL Percona mariadb three have their own audit plugin, but, MySQL audit plugin is only Enterprise version, but also have a lot of third-party MySQL audit plugin, and Percona and MARIADB are GPL audit pluginFirst look at the MARIADB audit

CREATE TABLE ' comment ' (' c_id ' int (one) not NULL auto_increment COMMENT ' Comment ID ',' u_id ' int (one) not NULL COMMENT ' user ID ',' Name ' varchar (not NULL default ' COMMENT ' user name '),' Content ' varchar (+) not NULL default '

http://hongge.blog.51cto.com/ Backups of MySQL databases in a production environment are recurring operations, so it is common to write script implementations that periodically execute backup scripts through Crond scheduled tasks mysqldump Backup

About MySQL TuningThere are 3 ways to speed up the MySQL server, from low to high efficiency:Replace the problematic hardware. Tuning the settings for the MySQL process. Optimize the query.Replacing the problematic hardware is often our first

Two types of temporary tables in MySQLbole Online 2016-07-06 05:16:52 Read (4556) Comments (3) Statement: This article by the Sohu public platform to write the author, in addition to the official Sohu account, the view is only representative of

Simple notes for installing mysql 5.7.17 in windows 10, mysql5.7.17 I have been using MySQL in Linux for a long time, and the installation is also very simple. Today, I tried to install MySQL in windows and found that it is really a pitfall. Now,

Install the decompressed MySql version on Windows 10 (recommended) and decompress mysql Decompress mysql win10 Download and decompress Mysql: Download link for version 5.7.13 (you can download it directly through the zip link on the official website

Mysql int (3) and int (11) Differences, mysqlint Difference between mysql int (3) and int (11) In summary, int (M) zerofill, followed by zerofill, then M shows a little effect. For example, if int (3) zerofill is inserted into the database as 10, it

The importance of system logs, I believe everyone has a deep understanding, when a fault occurs, the first time is to view the relevant error information and log information, to locate the problem, you can also based on the log, analyze logs to

Cause Analysis of excessive MySQL sleep process connectionsWhen the php page is executed, everything is automatically released. I believe many people share the same idea. It turns out that this is not the case. For example, the session will not be