MySQL

MySQL database encryption and decryption:Data encryption and decryption are important in the area of security. For programmers, storing user passwords in a database with ciphertext is significant for intruders to steal users ' privacy.There are a

Workaround:There are two workarounds, the first one being declared as deterministic or no SQL with reads SQL data when creating subroutines (stored procedures, functions, triggers), for example: Create Definer = Current_User PROCEDURE ' Newproc ' ()

The implementation principle of database replication replication:1: The primary server where the statement is run produces a binary log binlog2: Continuously read the binlog of the master server from the server3: Binlog translated from the server to

MySQL restricts the size of packets accepted by the server according to the configuration file.Sometimes large inserts and updates are limited by the Max_allowed_packet parameter, resulting in failure.View current configurationShow VARIABLES like

1, the inquiry "001" course is higher than "002" of all students of the school number;Select a. ' s# ' from (select ' s# ', score from SC where ' C # ' = "001") A,(SELECT ' s# ', score from SC where ' C # ' = "002") bwhere A.score>b.score and A. ' s#

The ORDER BY keyword is used to sort the data in the recordset.ORDER by keywordThe ORDER BY keyword is used to sort the data in the recordset.The ORDER BY keyword defaults to sorting the records in ascending order.If you want to sort in descending

Everybody whether to import the database when the guide will appear this error, the reason for this error is that your database is a bit large, the data is a bit more, the import time is too long and the server lost connection, let us see how to

The main record is the process of configuring master-slave replication and issues. Reference link: http://blog.sina.com.cn/s/blog_4c197d4201017qjs.html.First, MySQLLocal Windows environment, download the free install version, extract two copies to

1, Main library: Back up Database to from library 1), Backup scriptmycnf=/etc/My.cnfuser=Rootpasswd=Xxxxxxxxxxxxxxxxxsocket=/data/mysql/3306/var/run/mysql.sockdest_ip=192.168.30.27Dest_user=Rootdest_dir=/data/Mysql_19backupname=mysql_ 'Date+%f_%h-%m-

MySQL root password forget, view or modify the workaround:1. Start the command line first2. Run at the command line: taskkill/f/im Mysqld-nt.exe3. Continue to run at the command line: Mysqld-nt--skip-grant-tables4. Open a new command line run: mysql-

Tar XF mysql-5.5.49.tar.gzCD mysql-5.5.49cmake-dcmake_install_prefix=/webapp/marlonm/mysql5.5.49.MakeMake installcd/webapp/marlonm/mysql5.5.49scripts/mysql_install_db--user=marlonmNohup Bin/mysqld_safe--user=marlonm &sudo cp

Straight to the subjectOne, SQL statement: SELECT * FROM table limit Startpagenum,everypagenum1) Statement parsing:Table: The tables you want to queryStartpagenum: Starting from how many barsEverypagenum: Number of pages per pageMore than two, the

MySQL pre-compilation featurePre-compilation BenefitsEveryone uses the PreparedStatement interface in JDBC, which has pre-compiled functionality. What is a precompiled feature? What good does it have?When a client sends an SQL statement to the

Cause investigation:Receive a large number of email alerts Presumably, ask colleagues what happened? Colleague login from the library view, found the following error prompt, indicating that synchronization with the main library failed, always stuck

http://www.dbasquare.com/2012/04/01/how-to-find-mysql-configuration-file/A customer called me today asking for help with locating the configuration file used by one of the their production MySQL inst Ances. From the description I am given it

According to the error, the obtained main library file format is wrong.First, lock the master-slave Normal LibraryMysql> flush tables with read lock; Lock tableUnlock tables; UnlockSHOW MASTER STATUS;Main MySQL add user to connect from server: GRANT

For a user, there are three things about permissions: What permissions I have (how to view), how I delegate permissions to others (how to authorize), and how to retrieve permissions. InThere are three types of syntax that can be done in MySQL:First,

From:http://www.cnblogs.com/allenblogs/archive/2010/08/12/1798247.html1. First verify that the server is in a secure state, that is, no one can connect to the MySQL database arbitrarily.Because the MySQL database is completely password-protected

MySQL MHA configuration FAQ MHA is widely used in MySQL databases. It is compact, easy to use, and powerful. It enables manual master-slave failover Based on the MySQL replication architecture, redirects from the database to the master database, and

MySQL Date and Time Functions DAYOFWEEK (date)The return date is the day of the week (1 = Sunday, 2 = Monday ,...... 7 = Saturday, ODBC Standard)Mysql> select DAYOFWEEK ('2017-02-03 ');-> 3WEEKDAY (date)Returns the date of a week (0 = Monday, 1 =