MySQL

What scenarios does MySQL backup need to back up? What is the effect of such a backup? Remember that the purpose of the backup is to recover.Scenario One:Development students require DBA update or delete some data, at this time you feel it necessary

Direct SQL (self-extracting code, unable and order by rand () multiplexing):Select from Select @tt:=CONCAT (@tt,',' as from a table A, ( Select@tt:='ORDERbydesc 0,1Stored Procedure version:BEGIN DECLAREIs_endINT DEFAULT 0; DECLARE_Str VARCHAR( -

Installation of MySQL 5.6:1, install the dependent library environment in advance.Yum install-y make Bison cmake gcc-c++ ncurses ncurses-devel git2, download unzip.wget http://mirrors.sohu.com/mysql/MySQL-5.6/mysql-5.6.31.tar.gzTAR-ZXVF mysql-5.6.31.

Database, we know is to store data warehouse, data can be text, images, audio and video (like this relatively large data is usually stored in the database is its corresponding storage address), then what is the relational database, simply speaking,

MySQL startup failure cannot find a reason later queryLocalhost.localdomain.err files in the/var/lib/mysql directoryAn error occurred[[Email protected] local]# service MySQL start160704 15:57:28 [ERROR]/usr/sbin/mysqld:can ' t find file:

How do I build a MySQL index?CREATE INDEX principle1. The left prefix principle:The MySQL index match will be matched from right to the end of the encounter (> 3 and d=4. At this point, index d is not used. A truly valid index (a, B, c). If the

http://blog.itpub.net/133735/viewspace-691196/Init_connect can be dynamically adjusted online, so there are some other usesAfter testing the Init_connect, the user logs on to the database and executes the contents of the content before executing the

MySQLThe query is as follows: SELECT b. MemberID,b. MemberName,AA. OrderID,AA. ProductID,AA. ProductName,AA. Other,AA. Num,C.Paytime from (SELECT a. OrderID,a. ProductID,a. ProductName,a. Other,SUM (A. Number) num from Pengcz_order.order_details_b2b

Posted by Talks on 2012/02/23 |The first chapter of the prefaceSecond connection optimizationThird Article index optimizationFourth query optimizationThe fifth chapter to the actual combatIndex optimizationIndex optimization involves several aspects,

Today research Cobar, do the execution time test, need to lock the table record. The following two methods are used to lock the table records.The first way:Begin Start a transactionSELECT * FROM table name (where ...)   ) for update; So the result

Note: Because the mysql5.5 source package installation and the previous version of MySQL installation method is different, so write an essay record. The version of 5.5 is no longer the./configure make made install the CMake is used here, CMake is a

innochecksum:--offline InnoDB data file checksum checkMsql2mysql: Used to convert an app written by mSQL to MySQL.Myisamchk:myisam the integrity of the table and fix the detected errors.Myisam_ftdump: After you create a full-text index, you can use

Error Recurrence:use rm-f ib* to delete data files and redo log files. At this MySQL process also exists, MySQL can also be used normally. File Recovery:1 : Find mysqld the process number. # NETSTAT-NTPL | grep mysqld TCP 0 0 0.0.0.0:3306 0.0.0.0:*

Query the trace information for the specified SQLMysql-uUSER -PPWD -HHOST"\INS_TC_PRD; Set session Optimizer_trace='enabled=on'1638400SQL Select * from Information_schema.optimizer_trace\g; " > Trace_log.logTo view the usage of a tablespaceSelect

Because for performance reasons, general log does not open. Slow log can locate some performance-related SQL, and the general log records all SQL.mysql5.0 version, if you want to open slow log, general log, need to restart, starting from the MySQL5.1

[[Email protected]]# cmake The following error message appears: --Could not find Curses (missing:curses_library curses_include_path)CMake Error at cmake/readlinenanake:82 (MESSAGE):Curses Library not found. Pleaseinstall appropriate

1. Time TypeMySQL's Date,datetime,timestamp and time data types.A datetime type is used when you need a value that contains both date and time information. MySQL retrieves and displays the datetime value in ' yyyy-mm-dd HH:MM:SS ' format, supported

MySQL repication1MySQL repicationprinciple    The write operation of the front-end user, or the database modification operation, is logged to the binary log file, save as an event, Master sends Binlog to slave MySQL server via port 3306, slave MySQL

Distributed consistency algorithm-Raft, consistency-raft In the previous article, we talked about the Paxos protocol. This article describes the Raft protocol, which is simpler and easier to implement than the Paxos protocol. For Raft protocol and

Mysql optimization and mysql optimization solution 1. enable one data file setting for each table in InnoDB InnoDB can store the information of each database in A. idb data file. Each. ibd file represents its own tablespace. In this way, the class