MySQL

When accessing the MySQL database, the project often appears communications link failure error, which seems to be an idle connection over the database settings "Wait_timeout", MySQL will be out of the connection, The MySQL connection pool also

Tag:mysql   my.cnf    optimization     [client]port            = 3306socket           = /tmp/mysql.sock[mysqld]port             = 3306socket           = /tmp/mysql.sockskip-external-lockinglog-error=/usr/local/mysql/log/error.logkey _buffer_size = 5

The building of a table is actually the process of declaring a column, building a table statement: The Create Tables table name (column name 1 column Type column property default value, column Name 2 column type column property default value, Index

LOADDATA LOCAL INFILE'C:/xampp/htdocs/test/file/sample.csv' into TABLESample1fields TERMINATED by ','Enclosed by '\"'LINES TERMINATED by '\ r \ n'IGNORE1LINES (Presidency, President,@x,@x,@x, Party,@x,@x,@x)You can insert the specified line,

Summary You have a error in your SQL syntax; Check the manual, corresponds to your MySQL server Versio This sentence for us is not unfamiliar, nothing more than "," and so on. But if you inadvertently add a reserved field in MySQL as the field name

There has been a misunderstanding of the index, plus index of the disadvantage is that the increase in storage space, and increase the cost of adding and removing, but these I think for more and more good hardware, there is no big problemSo I always

MySQL Modify table field name:ALTER TABLE tablename Change oldname newname TINYINT;To import data from one table into another table:Category one, if the fields of the two tables (export table and target table) are consistent, and you want to insert

1. Install MySQL serverHttp://cdn.mysql.com/Downloads/MySQL-5.6/mysql-5.6.21-winx64.zip2. Install MySQL vs plugin (version please download the latest version)Mysql-for-visualstudio-1.2.3.msi3. Install for. NET ConnectorsMysql-connector-net-6.9.4.msi4

Last night to help friends set up a server, has been a yum MySQL can not install. The error message is as follows:Transaction Check Error:File/etc/my.cnf from install of mysql-libs-5.1.66-2.el6_3.x86_64 conflicts with file from package lunamp-1.1.9

When MySQL is compiled in centos6.5, the following error occurs: exec: g ++: not found. ./Configure -- prefix =/usr/local/mysql -- with-extra-charsets = all -- with-innodb -- with-plugins = partition Then make The following error is

Install the mysqlzip package in 64-bit win7 1) download the zip package and decompress it. 2) Configure environment variables to the bin directory. For example, your own directory is: F: \ mysql \ mysql-5.6.21-winx64 \ mysql-5.6.21-winx64 \ bin 3)

MySQL study note _ 12_Linux C ++/C connect to MySQL database (2) -- return the data SQLZookeeperConnect C ++/C to the MySQL database in Linux (2) -- SQL statement for returning data reference: SQL statement for returning data refers to extracting

MySQL study note _ C ++/C in 13_Linux connect to MySQL database (3) -- Process returned dataZookeeperConnect C ++/C to MySQL database in Linux (3) -- Process returned data 1. Number of fields in the returned result setUnsigned int mysql_field_count (

Design and writing of MySQL learning note_6_ SQL language (II) SQL language design and writing (II) -- SELECT query   Summary: SELECT [ALL | DISTINCT] # distinct is DISTINCT, clear, and different. {* | Table. * | [table.] field1 [asalias1] [,

MySQL obtains slow log information by time. Handle a case today: the database is abnormal and the number of connections suddenly increases.I want to analyze the slow log, but I can see that the slow log is several GB, and it is a short log format.

Some Suggestions on using Perl DBI for MySQL operations, perldbi Using perl to connect to mysql, there are many cases on the Internet. Generally, we use the DBD: MySQL module under DBI. Here we create a mask to get a TIPS:Perl DBI MySQL Character

Mysql common SQL statements (1)[1] Clear TABLE statement truncate table fke_message; [2] resetting the start value of the auto-increment Field alter table fke_message auto_increment = 10001; [3] common table creation statements Drop table if

MySQL study note _ 5_ SQL language design and writing (I) SQL language design and writing (I) I. SQL statement Classification Data Definition Language (DDL ): Defines and manages data objects, including databases, data tables, views, and indexes.

A simple paging Optimization Method for MySQL in Big Data scenarios. Usually, an application needs to flip the data in a table. If the data volume is large, it may cause performance problems: root@sns 07:16:25>select count(*) from reply_0004 where

Optimization of not in and minus in MySQL, mysqlminus Before optimization: select count(t.id) from test t where t.status = 1 and t.id not in (select distinct a.app_id from test2 a where a.type = 1 and a.rule_id in (152