Reasonable allocation of MySQL cache to improve cache hit rate

It is well known that the system reads data from memory hundreds of times times faster than it does from the hard disk. So now most of the application system, will maximize the use of caching (in memory, a storage area) to improve the system's operational efficiency. MySQL database is no exception.   Here, the author will combine their own work experience, with you to explore the MySQL database Cache management skills: How to properly configure the MySQL database cache, improve cache hit rate.   When will the application get the data from the cache? Database read from server ...

Get MySQL change character set scheme

Do you have a headache for getting MySQL to change the character set? Don't worry, the following article will give you the correct solution, the following article is mainly introduced to get the MySQL change character set scheme, the following is the specific description of the relevant content.   ROR+MYSQL5 UTF8 collocation problem Solution C # +mysqldriver.dll garbled problem 1, with the SET syntax to specify, do not add "GLOBAL" is only valid for this session. ...

MySQL tips: do limit optimization

When querying data, we often need to specify a few rows of data to be returned. As now there is a B/s architecture application, each page may display only 30 records. In order to improve the efficiency of the display, the database is generally required to return only 30 records at a time. When the user presses the next page, return 30 records from the database, and so on. This can shorten the time that the data is displayed. This is very effective when the base table for the query is larger. You can use the Limit keyword to implement this requirement at this time. The limit clause can be used to force a SELECT query statement to return ...

MySQL scheduled backup Windows host

For Windows host ============== hypothetical environment: MySQL Installation location: C:mysql Forum database name: BBS MySQL root password: 123456 database backup destination: D:db_backup program code @ech o off c:mysqlbinmysqladmin-u root--password=123456 shutdown ...

MySQL sometimes forget the password how to do?

MySQL sometimes forget the password how to do? I give a case and explanation!   The actual operation under Windows is as follows 1. Close running MySQL.   2. Open the DOS window and go to the Mysqlbin directory. 3. Enter Mysqld--skip-grant-tables carriage return.   If you don't get a hint, that's it.   4. Open a DOS window again (because the DOS window is already unable to move), go to the Mysqlbin directory. ...

MySQL does not use the rand () function to implement random read database records method

The MySQL tutorial does not use the rand () function to randomly read the database tutorial records, as well as Google the relevant files, found that everyone almost exclusively using ORDER by RAND () to achieve this, but in fact there are very serious performance problems. If your database has only hundreds of, and the number of calls is not many times, you love what method to use what method. But if you have 100,000 or 1 million or more data, then each time you execute the SQL with ORDER by rand () ...

Reason analysis and solution of MySQL automatic stop

MySQL tutorial automatic stop cause analysis and solution Start menu-run-services.msc find MySQL service and double-click the Recovery tab to fail for the first time: default is "Do not operate", change to "restart service". Adding "0" at the bottom of "Restart Service: ___ Minutes" means that the service restarts immediately if it terminates unexpectedly. Click OK to make the settings effective. At this point you end the MYSQL-NT process in the Task Manager, you will find that the end is not lost but pay attention, so mys ...

MySQL Add new user and modify password method

MySQL tutorial Add new user and modify password method format: Mysqladmin-u username-P Old password password new password 1, give root add a password ab12. First in DOS into the directory mysqlbin, and then type the following command: Mysqladmin-uroot-password AB12 Note: Because the beginning of the root does not have a password, so-p old password one can be omitted. 2, and then the root of the password changed to djg345. Mysq ...

Forget MySQL root password mysqladmin Modify password method

Generally come out forget the password is a new MySQL novice friend, below we tell you how to use mysqadmin to change the password to come. I'll take a few examples and I'm sure I'll see. 1, the original password is 123456 c:>type mysql5.bat @echo off mysql-uroot-p123456-p3306 correct changes to the MySQL user password format is: We use the User: root (can be replaced by other) Password: WoS ...

Forget MySQL's root password reset method under Linux and Windows servers

Article to introduce about the forgotten MySQL root password reset method, also introduced in different operating systems, the following describes the Linux and Windows solutions, there is a need for friends to understand. If you forget the MySQL root password, you can reset it in the following ways: Linux action method in my.cnf [mysqld] field add: Code as follows Skip-grant-tables ...

Delete string or field hollow function in MySQL

The Ltrim,rtrim function is provided in MySQL to remove the first Mao of the character so if I want to delete the word Furu "ABC Fdsa" How To do it, let's look at the tutorials LTrim the function code below mysql> Select Concat ('. ', LTrim   (' DDD '), '. '); RTrim function code as follows Mysql> sel ...

SQL intercept field last content statement separated by a specific character

This article introduces a MySQL batch intercept the last separated part of the SQL statement to another field to have a friend in need of reference. --field images saved data is: A.jpg;b.jpg;c.jpg to the images of the last picture c.jpg assignment to Images_default execution of the SQL statement is the code as follows UPDATE product SET ' Image_ Default ' = REVERSE ...

MySQL () rand () random query logging efficiency issues and solutions

In our development of the efficiency has been a problem, especially for a lot of large data operations, today we ran into a random query data, at first we may think of the simplest order by RAND () to operate but the efficiency is not flattering ah. Recently, because of the need to study the MySQL random extraction implementation method. For example, to randomly extract a record from the TableName table, the general wording is: SELECT * from TableName ORDER by RAND () LIM ...

MySQL server query slow reason analysis and solution

In the development of friends especially and MySQL have contact friends will encounter sometimes MySQL query is very slow, of course, I refer to the large amount of data millions level, not dozens of, the following we take a look at the resolution of the query slow way. -Often find developers looking up statements that are not indexed or limit n, which can have a significant impact on the database, such as a large table of tens of millions of records to scan all, or do filesort, and the database and server IO impact. This is the case above the mirrored library. And ...

phpMyAdmin resolve to import more than 2MB SQL file method

The default import database file in phpMyAdmin can only be within 2MB, but our data files will be above 2MB for most of the time, so let's look at a couple of different solutions. The easiest way is to open the import.php file in the phpMyAdmin section with WordPad: 1, find the $memory_limit, default to $memory_limit = 2 * 1024 * 1024; 2, below the position of three or four lines have the same statement, repair ...

The method of preventing the MySQL user root password weak password

The article introduces about preventing MySQL user root password weak password attack, we can see their MySQL root is also a security risk. 1, connect to each other MySQL server mysql-u root-h 192.168.0.1 mysql.exe This program in your MySQL installed bin directory. 2, let us look at some of the server database mysql>show databases; MySQL default installation ...

MySQL database table '. Phome_ecms_news ' is marked as crashed and last (automatic?) Workaround

Last night, the msql of the website suddenly had a problem, the index of the article is broken, looking for a long time to fix the Baidu search, said with phpMyAdmin repair damaged table, according to do, the problem did not solve, helpless district of the official find the answer, finally solved, the harm of my cold did not wear clothes for half an hour! If your server is a stand-alone host, it is strongly recommended that you repair it using the command-line method: Stop the MySQL service before fixing it. If it is a win host, open the command line mode, and then enter the MySQL bin ...

Install phpMyAdmin hint PHP 5.3+ is required solution

The simple point is that you download the phpMyAdmin version is too new, the minimum need php5.3.x the above version to run, so there are 2 ways to solve. 1, download the old version of phpMyAdmin 2, upgrade the PHP program to 5.3.x to resolve personal recommendations, or change a phpmyadmin insurance point. Download Address: http://www.phpmyadmin.net/home_page/downloads.php Select Phpmyad ...

Tutorial on cookie variable usage in PHP

PHP cookies Use the detailed tutorial 1, set cookies PHP with the Setcookie function to set cookies. It is important to note that cookies are part of the HTTP protocol header and are used to pass information between browsers and servers, so you must call the cookie function before any content output that belongs to the HTML file itself. The Setcookie function defines a cookie and attaches it to the back of the HTTP header, the prototype of the Setcookie function is as follows: int Set ...

PHP $ _post Function and $_get function

PHP Tutorial $ _post function and $_get function in detail 1, get is to obtain data from the server, post is to send data to the server, 2, gets the form of data in the form of variable=value, add to the action point of the URL after the And both use "?" Connection, and the "&" connection is used between the variables. Post is to put the data in the form in the form's data body, according to the variable and the value of the corresponding side ...

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