MySQL

MySQL log:140614 9:45:36 [Note] Plugin ' federated ' is disabled.140614 9:45:36 innodb:the InnoDB memory heap is disabled140614 9:45:36 innodb:mutexes and rw_locks use Windows interlocked functions140614 9:45:36 innodb:compressed tables use zlib 1.2.

Create a TriggerGrammar:Create TRIGGER Trigger NameCreate trigger Xiaoshou_update_trigger after update on Xiaoshou for each row begin update Jiangjin set xiaoshouer= (select SUM (Taoshu*danjia) from Xiaoshou where Userid=new.userid and

#统计指定架构的所有表的数据和索引大小情况#tablesize. Sh#!/bin/sh#[email protected]If ["$#"-GT 2];thenecho "**********************************"echo "Too many input parameters"echo "**********************************"echo "USAGE01: $ schema_name table_name"echo "EG01: $

MySQL Custom sort orderExample: Adding an ORDER by FIELD (status,3,4,0,2,1) statement to a SQL statement defines the sort orderSELECTtsdvoucher0_. voucher_id asvoucher1_0_, Tsdvoucher0_.comment_device_type ascomment2_0_, tsdvoucher0_.comment_id

MySQL Lock:There are many types of locks inside MySQL, which can be divided into two categories depending on the purpose:1. Lock that protects the memory structureThe server layer is basically protected with Mutex,rwlock for thread-shared

Open Navicat MySQL management toolConnecting to a databaseSelect Test DatabaseClick QueryEnter the corresponding SQL commandCreate TableTuser (unamevarchar( -) not NULL Primary Key, Upwdvarchar( -) not NULL );Create TableP_info (Pkeyvarchar( the)

I found the password was wrong when I logged in to MySQL with the root user.[Email protected] ~]# mysql-u root-pEnter Password:ERROR 1045 (28000): Access denied for user ' root ' @ ' localhost ' (using Password:no)Workaround1. Stop MYSQLD

in order to learn the ORM, chose the EntityFramework, experienced three days and two nights of suffering, n times wrong, in the group of the help of master, finally succeeded, now will my mind history record down, one is let oneself have a record,

Overview There are two ways to import and export mysql Databases 1) Export the SQL script first and then import it (there are two types of Import and Export: 1. commands. 2. Tools. Here we only introduce commands ). 2) directly copy database

Operating System: win7 Mysql version: mysql 5.5 (64-bit) 1. Re-installing mysql stops at the last step. Problem description: After mysql is installed for the first time, Chinese characters written using jdbc are garbled, but Chinese data already

Customize a mysql STARTUP script according to the working environment --- 1. Save As/usr/local/mysql/scripts/mysql_env.ini # Set mysql init variablesMYSQL_USER = system # mysql UsernameMYSQL_PASS = 'Password' # mysql logon User password # Check

This article summarizes all the tools related to MySQL O & M development and will be continuously updated. 1. Toolkit set Percona-toolkit: http://www.percona.com/software/percona-toolkit Oak-toolkit:

Let's take a look at the width range of integer data types. Create a table Copy codeThe Code is as follows:Create table tb_emp (id BIGINT (1 )) The data type of the id field is BIGINT (1). Note the following number 1, which indicates the display

(1) Data Type Type Remarks Tinyint/smallint/mediumint/int/bigint 1B/2B/3B/4B/8B Float/double Single precision/Double Precision Floating Point Decimal No single-precision/double-precision floating point

Basic FormProperty name regexp 'matching Method'Regular Expression Pattern character^ Starting from matching charactersEg1: query records starting with L from the name field of the info tableSelect * from info where name regexp '^ l ';Eg2: query

Copy codeThe Code is as follows:#/Usr/share/mysql/my-huge.cnf# MariaDB configuration file sample template (huge, giant ).## This file applies to dedicated database servers with a memory of 1 GB to 2 GB.# Only large MariaDB systems are running on the

When using MySQL, you often create an auto-increment ID field in the table and use the auto-increment ID to quickly create an index. This is also a recommended method for MySQL. However, this method may cause synchronization failure due to

After two insert date types recently, the value is 0000-00-00 00:00:00, so I checked the official documentation and found the reason. In Mysql, we often use three data types to store dates: Date, Datetime, and Timestamp. The Date data type is used

PREPARE statement_name FROM SQL _text/* definition */ EXECUTE statement_name [USING variable [, variable...]/* EXECUTE preprocessing statement */ Deallocate prepare statement_name/* delete definition */This is used in my project for

1. sudo apt-get install mysql-server, input administrator password, '123' 2. enter mysql promot in command line, 'mysql-u root-p', input password 3. create database "create database xoops ;" 4. allow root remote login: grant all privileges on *. *