Comments: Several methods to crack the mysql root PASSWORD circulating on the Internet: Method 1: Use phpmyadmin, which is the simplest. Modify the user table of the mysql database, but do not forget to use the PASSWORD function. Method 2: Use
Step 1: upgrade linuxphp5.3.x to php5.5.x:
If the server is 32-bit, run the following command:
Wget http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpmWget http://rpms.famillecollet.com/enterprise/remi-release-6.rpmRpm-Uvh
The cause of this problem is:The number of connections exceeds the value set by MySQL. It is related to max_connections and wait_timeout. The larger the value of wait_timeout, the longer the idle waiting time for the connection, which leads to the
Early in the morning, I received a MySQL custom language warning: replication interrupt. It seems that an error was reported during master-slave synchronization.Log on to MySQL and run show slave status \ G to find that salve has stopped. Therefore,
After innodb_log_file_size is modified, InnoDB cannot be enabled. When/etc/init. d/mysqld restart is restarted, no error is prompted. When I use mysql> show engines;, InnoDB does not exist and I sweat. Check the log./var/log/mysqld. Log found an
MySQL does not support InnoDB solution bitsCN. comG. the solution is as follows:
In the/var/lib/mysql Directory, delete ibdata1, ib_logfile1, and ib_logfile0, and restart MySql to recreate the above files:
Mysqladmin-uroot-p shutdown
Sudo
The concept of Dual-machine Hot Standby is simply to maintain automatic synchronization of the two databases. Operations on any database are automatically applied to another database, and data consistency is always maintained between the two
Problem: the system time is different from the database time. the system time is, and the time saved to the database is.
The first intuition is caused by different time zones.
First look at a piece of code:
Java code
Public static void main
Error description:
There was no problem in the test for a period of time. Today, the user suddenly cannot log on, and an error is reported, such as data source rejected Establishment of connection, message from server: "Too has connections"
Error
MySQL Common ErrorsError message:InnoDB: Unable to lock./ibdata1, error: 11Solution:PS-Ef | grep mysqld, killing dead processes
Then restart MySQL---------------------------------------------------------------------------------Error message:Error
1. log on to MySQL-uroot-P.
2. MySQL cannot be accessed from the Internet in Linux
You have granted permissions in MySQL. It is still inaccessible on the Internet.
Problem:
CAT/etc/MySQL/My. conf
Find the following line
Bind-address =
How to set the maximum number of connections of MySQL
MySQLAfter the database is installed, the defaultMax connectionThe number is 100. Generally, forum orWebsiteThis number of connections is far from enough. There are two ways to increase the
MySQL Master/Slave configuration note:
There are four machines in total: A (10.1.10.28), B (10.1.10.29), C (10.1.10.30), and D (10.1.10.31 ).
After the configuration result: the A-C is the master and slave, B is the slave of A, D is the slave of C.
The solution is to modify/etc/MySQL/My. CNF and add the following line:
Set-variable = max_connections = 500
Or add the parameter max_connections = 500 to the startup command.It is to modify the maximum number of connections, and then restart
G, the solution is as follows:
In the/var/lib/MySQL directory, delete ibdata1, ib_logfile1, and ib_logfile0, and restart MySQL to recreate the above files:
Mysqladmin-uroot-P Shutdown
Sudo mysqld_safe &
Done!
Below are otherArticle. For more
An error occurred while backing up mysql, but the website is running normally
Localhost :~ #/Usr/local/mysql/bin/mysqldump -- lock-tables = FALSE-uroot-p webadb_com>/root/webabc. SQL
Enter password:
Mysqldump: Got error: 2002: Can't connect to local
MySQL Optimization-permission management and mysql permission management
Reprinted please indicate the source: http://blog.csdn.net/l1028386804/article/details/46763767
In the mysql database, the mysql_install_db script initialization permission
The MySQL master-slave structure is based on mysql incremental logs, which is different from the master-slave replication structure.
In the master-master replication structure, any changes to the data inventory on one of the two servers will be
MySQL multi-instance Configuration
Lab environment: RHEL6.4 for minimal installation, mysql installation package for general binary installation package, version for mysql-5.6.26
1. Create a mysql user
# Useradd-M-s/sbin/nologin mysql
# Yum-y
MySQL root Password forgot SolutionSummary in many cases, the default password of the root user is not blank after mysql is installed. In this case, you need to log on to mysql to reset the password. Step 1: View/root /. mysql is installed in the
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