MySQL

1. Why can I set it to multiple redo log? (Innodb_log_files_in_group, the default value and the recommended value are 2, we set the line of unity is 4);2. What conditions will trigger the brush dirty? In addition to master_thread\ mandatory

Error log: Log_error,log_warningsInformation in the server startup and shutdown processError message during server runEvent scheduling information that is generated when an event is runInformation generated from the server process when it is started

#!/bin/bash#MySQL备份dates= ' Date +%y%m%d 'datey= ' date-d ' days Ago "+%y%m%d"Mkdir-p/home/backupCd/home/backupMysqldump-uroot-pwyqj_root fight_cancer > Fight_cancer. $dates. sqlMysqldump-uroot-pwyqj_root redmine > Redmine. $dates.

#!/usr/bin/env pythonImport Time,mysqldbFrom subprocess Import PopenFrom subprocess Import PIPEImport Dns.queryImport Dns.messageImport Dns.tsigImport dns.tsigkeyringImport Dns.updatedef set_dns (ip_list):Key=dns.tsigkeyring.from_text ({"cui.com":

Define a stored procedure, use a cursor, take a value from one table, and insert it into another table.drop procedure if exists search_test;CREATE PROCEDURE search_test (in ID int,out out_min_id varchar (200))BeginDeclare finished boolean default

Many high-performance sites use the "explode-connect" technique, which is to change a single multi-table connection query to multiple but table queries, and then merge the data into the program, such as:Select A.*,b.* from a a joins b b on a.id =

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 --存储过程名和参数，参数中in表示传入参数，out标示传出参数，inout表示传入传出参数create procedure p_procedurecode(in

1. Prepare the file system for data storageCreate a new logical volume and mount it to a specific directory. The process is no longer given here.This assumes that the mounted directory of its logical volume is/mydata, and then needs to create

1. Create a Java project in Eclipse 2. Introduce the JDBC Library (in extenrnal of bulid path) 3. 1) import the SQL package (import java. SQL .*) 2) load (Register) the mysql jdbc driver Class. forName ("com. mysql. jdbc. Driver "); 3) connect to

Show [session | global] status you can add the parameter "session" or "global" as needed to display the session-level (current connection) statistics and global-level (since the last time the database was started). If this parameter is not specified,

Start MySQL 1. initialization module execution & initial storage engine execution 2. After the execution is completed in step 1 ----> the connection management module takes over 3. The connection management module starts the listening program

Mysql provides three installation methods: binary, rpm, and source code compilation. Here we will discuss in detail how to compile and install mysql source code. Mysql does not support configure compilation after version 5.5. Instead, it uses the

LNMP1.0 can be used to quickly build a PHP environment in a Linux system. Previously, the LNMP environment has been used to operate other servers, and similar errors have not been detected. Now we will record the solution process. I. server

Use case when for string replacementCopy codeThe Code is as follows: mysql> select * from sales; 9 rows in set (0.01 sec) SELECT name AS Name,CASE categoryWHEN "Holiday" THEN "Seasonal"WHEN "Sion" THEN "Bi_annual"WHEN "Literary" THEN "Random" end as

Mysql update select usage example Inner join should be used, I .e: UPDATE friends inner join users ON friends. friendid = users. userid SET friends. friendname = users. username MySQL uses a temporary table to implement nested queries in The FROM

I. First explain why Table sharding is required:When a piece of data reaches several millions, it takes more time for you to query it at a time. If there is a joint query, it may die there. The purpose of table sharding is to reduce the burden on

Scenario:Master database DB: utf8 Character SetSlave database DB: gbk character set Requirements:Verify that the master and slave data are consistent and repair Verification process:Set the master database connection to utf8, set the slave database

Mysql Stored Procedure in END compound statement usage example Begin_label:] BEGIN [Statement_list] END [end_label] You can use the in... END compound statement to store subprograms to contain multiple statements. Statement_list indicates the

Mysql database KEY partition usage Partitioning by KEY is similar to partitioning by HASH. Except for the User-Defined expression used by HASH partition, the HASH function of KEY partition is provided by the MySQL server. MySQL Cluster uses the MD5

I have been familiar with relational databases mainly oracle and sqlserver, But I know little about mysql. However, I found that mysql is very similar to oracle, so it should not be difficult to learn it, in summary, we may focus more on the