MySQL

My colleague reported that the system could not log on to the background, and reported that the system could not connect to the database. I immediately checked that the number of connections had reached 1000, and the number of connections had been

  Since an import process was roughly interrupted in September 30, I found that MySQL could not be started, so I had to uninstall and reinstall it (maybe it may take some time to find the problem, but it is faster ). When the import process is

Error:1)Caused by changing the master:Last_IO_Error: error connecting to master 'repl1 @ IP: 100'-retry-time: 60 retries 2)Stop the slave process without unlocking:Mysql> stop slave;ERROR 1192 (HY000): Can't execute the given command because you

  Mysqld Program-directory and file Reference Basedir = path uses the given directory as the root directory (installation directory ).   Character-sets-dir = path indicates the directory where the character set is stored.   Datadir = path reads

  How to check and analyze logs under Freebsd is still a new topic for me. I haven't processed it before, and I don't even know where the logs are stored or how to record them.   There are some good information on the network. mysql manuals can also

  I recently encountered various problems when configuring mysql. I would like to summarize them.   After mysql is installed, the local machine can be connected, but other machines cannot be connected. The reasons are as follows:   1. For

  Disable/enable Red hat Firewall   /* Disable the firewall */   Service iptables stop   /* Enable Firewall */   Service iptables start   /* Disable the firewall by default */   Chkconfig iptables off   Authorization method. For example, if you want

  On a high-concurrency MySQL server, transactions will recursively detect deadlocks. When the depth is exceeded, the performance decline will become unacceptable. FACEBOOK has long proposed a deadlock prevention test. We conducted an experiment to

Today, I will continue reading the book "mysql database development" recommended by the instructor. I encountered a problem when I saw the foreign key association problem with the innodb database, in the book, you can modify the parent table and

Many people think of MySQL Cluster or Heartbeat + DRBD when it comes to the high availability of MySQL. However, the complexity of these solutions is often daunting, using MySQL replication to achieve high availability is much easier. Currently,

The insert statement exported by tools is incorrect. The exported result Insert to values (ENTERNO, sequence, sequence, INNO, INTP, INBILLNO, PRODENTERID, PRODLVL, BIGVARIETY, SMALLVARIETY, SPECIFICATION, PIECE, BOXES, PRICE, TOTALAMT, PRODDT,

1. Download The pdo_mysql package Wget http://pecl.php.net/get/PDO_MYSQL-1.0.2.tgz 2. append and compile php so that pdo_mysql.so files are generated under the module Directory.Tar zxf PDO_MYSQL-1.0.2.tgzCd

There are many unequal situations in our project. This article briefly analyzes how to optimize it. The table sharding logic here is based on the number of user_name groups in the t_group table.In this case, the index on the user_name field is a bad

A new library is created with the default encoding. Import utf8 encoded tables and data. The results are all garbled. Changing the encoding of the SQL file still does not work. Finally, we found that utf8 encoding was not set during database

The error message is as follows:$ Mysql-urootERROR 1040 (00000): Too connector connections I used the mysql5 server as win2000 to solve the problem. I found the mysql installation directory, such as C: windowsmysql, and found the my. ini

In MySQL, we generally use show status to query the server STATUS. The syntax is generally as follows: SHOW [GLOBAL | SESSION] STATUS [LIKE 'pattern' | WHERE expr] After executing the command, you will see a lot of content, some of which are Handler_

Difference between mysql and mysqli: mysqli connections are permanent connections, while mysql does not. Mysql connection: a new process is opened every second time. Mysqli connection: only the same process is used all the time. Benefit: this can

InnoDB and MyISAM are the two most common table types used by many people when using MySQL. The two table types have their own advantages and disadvantages, depending on the specific application. The basic difference is that the MyISAM type does not

The method for adding fields in MySQL is not complex. The following describes how to add and modify fields in MySQL. It is helpful for you to learn how to add fields in MySQL.1. log on to the database> mysql-u root-p database name 2. query all data

MySQL uses the default Character Set of latin1. That is to say, the Chinese character fields are stored directly using the GBK internal code encoding, if you want to sort the fields with Chinese characters in pinyin (especially those with names),