MySQL

Problem: A large number of warning occur when executing the following statement 1292mysql> UPDATE show_info INNER JOIN show_like on show_like.show_id = show_info.show_id SET show_info.status = 0 WHERE sh ow_like.show_id = 1 and show_like.cid = '

Preparatory work:Master-Slave operation----Close SELinux and iptables or open 3306 ports (iptables-a input-p TCP--dport 3306-j ACCEPT iptables-a output-p TCP--spo RT 3306-j ACCEPT), time synchronization ntpdate time.windows.comMysql_1 Information:

Simple question about MySQL embedded application. Post a Reply7 posts page1Of1Simple question about MySQL embedded application.by Tanghz »mon Oct 2010 23:29HiI am wondering how I can use the embedded MySQL server in a Delphi application via UNIDAC?

Yesterday just to the company server installed LNMP Server environment, here simply record the process memo.Here I am in the installation of the time is used Dotdeb source, for reference only.1. Import Dotdeb Source, it is said that the Dotdeb

How to add LocksSyntax for locking tables:LOCK TABLESTbl_name [as alias] {READ [LOCAL] | [Low_priority] WRITE}[, Tbl_name [as alias] {READ [LOCAL] | [Low_priority] WRITE}] ...Unlock syntax:UNLOCK TABLESThe InnoDB storage engine provides row-level

1, using the Count function to generate the summaryThe function function is easy to use, and the COUNT (*) statement is quick for the MyISAM table, but for BDB or InnoDB tables, avoid using it as much as possible, because the statement requires a

Source Address: http://www.blogjava.net/zyskm/archive/2013/04/09/361888.html The concept of a character set everyone knows, proofing rules many people do not understand, the general database development is also not used in this concept, MySQL in

Original link: http://www.cppblog.com/wolf/archive/2014/05/09/69089.htmlAfter MySQL version 3.23.44, the InnoDB Engine type table supports foreign KEY constraints. Use conditions for foreign keys:1. Two tables must be a InnoDB table, the MyISAM

Reprint Address: http://www.2cto.com/database/201212/175536.htmlIntegral type  www.2cto.com            integer types are the most basic data types in a database. Both integer and smallint types are supported in standard SQL. In addition to

About 50 pieces of graphs monitored by cacti on the mysql server have been obtained and shown. Some problems have been encountered and the impressive records are as follows:(1 ):Add io monitoring   Click Create Graphs for this Host to Create an IO

Linux Study Notes-install and uninstall mysql in ubuntu   Abstract: this article mainly introduces how to install and uninstall mysql, how to install mysql using apt commands, and how to solve the encoding problem. It will be solved in the following

1. Sample Problem: Log Of Failures Problem example: Fault RecordWhen INSERT fails, I want to record it in the log file to demonstrate the error handling example. I want to get an error record. When the INSERT operation fails, I want to record the

MySQLDatabaseMaster/Slave latencyHow to judge? This article introduces two methods for judging: 1. Seconds_Behind_Master vs 2. mk-heartbeat. Next we will introduce these methods separately. In daily work, for MySQL master-slave replication check, on

According to the Twitter project blog,Twitter decided to open source its optimized MySQL version. Twitter engineers Jeremy Cole and Davi Arnaut said in their blog: Reference MySQL is the main storage technology for most Twitter data,

How to manually split mysql Databases and mysql Databases Most Internet website applications use mysql as the database storage, which is limited to the bottleneck of mysql Single-host performance. To support larger capacity and larger access volumes,

Security equals operator () This operator and = Operator perform the same comparison operation, but can be used to determine the NULL value. When both operands are NULL, the return value is 1 instead of NULL; When an operand is NULL, the return

This document describes how to use the addslashes, mysql_escape_string, and mysql_real_escape_string functions to escape the form data submitted by users. The first thing to note is that the addslashes, mysql_escape_string, and

Basic Syntax: Load data [low_priority] [local] infile 'file _ name txt '[replace | ignore]Into table tbl_name[Fields[Terminated by 'T'][OPTIONALLY] enclosed by ''][Escaped by ''][Lines terminated by 'n'][Ignore number lines][(Col_name,)] The load

Mysql database groups are divided into three methods. Temporary tables are used for group by, compact (Tight) index scanning, and group by and Loose index scanning, but I often use 1. Use Loose index scanning to implement GROUP What is loose index

Mysqldump: one of its features is that the list needs to be locked during processing. Therefore, if we need to perform backup during working hours, it will cause DML blocking. However, MySQL usually has master and slave databases, and most of the