MySQL

Problem: mysqlhotcopy backup Error/Usr/local/mysql/bin/mysqlhotcopy-u root-p -- addtodest -- noindices -- flushlog-q qeedoo/tmp/bakInstall_driver (mysql) failed: Can't locate DBD/mysql. pm in @ INC (@ INC contains: /usr/lib/perl5/site_perl/5.8.8/i386

  Create two tables first. 1. student table 2. grade Table     I. mysql replication technology 1. Copy tables and data-> synchronize table structures and Data Create table desttable select * from srctable; (Desttable: target table, srctable:

Several principles for data type selection:   1. Smaller is usually better. Select the minimum type that correctly represents the data.   2. Easy to use. Simple types are better than complex types.   3. Avoid NULL. Try to define the field as not

  Five configuration parameters that closely affect MySQL Performance The following articles mainly introduce the five configuration parameters that closely affect MySQL performance. I saw the five configuration parameters that closely affect MySQL

Reprinted, please sign: Yin Feng-----------------------------------------------------------Recently, I encountered a problem where an online machine waited for the semaphore for a long time. The mysql monitoring thread thought that mysqld had been

The latest mysql versions require cmake compilation and installation. It is estimated that this method will be used in future versions. Therefore, we will record the installation steps and procedures for your reference.Note: This installation is the

Author: skateTime: 2012/02/17 Mysql records time-consuming SQL statements Mysql records time-consuming SQL statements or SQL statements without indexes in slow log for optimization analysis. 1. mysql slow query log enabled: Mysql slow query logs are

Author: skateTime: 2012/02/16 Mysql memory usage analysis  2. Global shared memory In global sharing, MySQL Instance (mysqld process) and underlying storage engine are used to store various global operations and shared temporary storage information,

1. Create mysql Stored Procedure p3 (first change the terminator delimiter $)Create procedure p3 (IN nameid int, OUT person_name varchar (10) nameid is the input parameter, and person_name is the output parameter.BeginSelect * from t_user;Select

20 million records need to be inserted in mysql. The insert statement has a limited insert speed. Hundreds of records are inserted every second. This speed can also be applied to hadoop clusters, which may be caused by database problems, the insert

Environment: One 10.32.33.120 is used as a data node, an SQL node, and a management node 10.32.34.116 as a data node and an SQL node. The operating system is CentOS5.4 64-bit.1. Download MySql Cluster7.2.5 http://www.mysql.com/downloads/cluster/

Mysql simple startup command 1. startup method 1. Use service to start: Java code www.2cto.com service mysqld start 2. Use mysqld script to start: Java code/etc/inint. d/mysqld start 3. start with safe_mysqld: Java code safe_mysqld & 2. stop 1.

When you modify the mysql character encoding, the following error occurs: Job failed to start. When you fill in the MySQL database in python mange. py shell, you cannot enter Chinese characters.Modify the MySQL database encoding.Find the following

Step 1 of configuring mysql master-slave synchronization in linux: host environment HOST: master Operating System: rhel6.0IP: 172.16.0.100 MySQL version: 5.1.47 slave: www.2cto.com slave Operating System: rhel6.0IP: 172.16.0.200 MySQL version: 5.1.47

There are many ways to set a password for mysql: 1. after entering mysql with root, mysql> set password = password ('your password'); mysql> flush privileges; 2. use the GRANT statement mysql> grant all on *. * to 'root' @ 'localhost' identified by '

Transient appearance on the MySQL server (5 ~ 30 seconds) when the performance fluctuates, it is difficult for general performance monitoring tools to grasp the fault site, and it is difficult to collect the corresponding fine-grained diagnosis

I found a rule in my project to solve the connection timeout problem of mysql for 8 hours. If the connection between an application and a database is established for more than 8 hours, if the application does not access the database, the database

Mysql show profiles is added after 5.0.37 to analyze SQL Performance. To use this function, make sure that the version is later than 5.0.37. Check my database version mysql> Select version (); + --------------------- + | version () | + --------------

Install mysql in Linux: Download the mysql source package and place it in/usr/local/src. Assume that my source package is: mysql.5.1.tar.gz create a user group and a user groupadd mysql // create a mysql user group useradd-g mysql // create a mysql

MySQL algorithm analysis in MySQL, there is only one Join algorithm, that is, the famous Nested Loop Join. It does not have Hash Join provided by many other databases, nor does it have Sort Merge Join. As the name suggests, Nested Loop Join uses the