MySQL

1.mysql-server only allow native (localhost, 127.0.0.1) to connect access for security reasons. This is not a problem for the site architecture of Web-server and Mysql-server on the same server. However, as the site traffic increases, the late

The ID of Google analytics is generally like: ua-18xxxxx-1, ua-18xxxxx-4, we can divide it into two segments: field 1:ua-18xxxxx refers to the ID of the account Field 2:1, 4 appended to field 1, respectively, refers to two sites under the account

A: whyBecause the data is stored in a database table, the index is created on a database table object, consisting of keys generated by one field or multiple fields in the table, stored in a data structure (b-tree or hash table) that can quickly and

A: whyBecause the data is stored in a database table, the index is created on a database table object, consisting of keys generated by one field or multiple fields in the table, stored in a data structure (b-tree or hash table) that can quickly and

First on the InnoDB frame composition:The top-down sequence is the memory area structure, background thread, operating system, disk storage, log files and so on.Where memory consists of buffer pool, additional buffer pool, log buffer pool. Where the

MySQL Installation Download the community version of the MySQL package (address), or Windows Installer To the target path by compressing the installation package Adding a target path to the system variable path Under the MySQL

Conceptif The index contains all of the data that satisfies the query, the index becomes the overwrite index (covering index), which is what you usually say does not require a table operation.Judging criteriawith explain, you can tell by the output

View all users in the MySQL databasemysql> SELECT DISTINCT CONCAT (' User: ', user, ' @ ', host, '; ') as query from Mysql.user;+---------------------------------------+| Query |+---------------------------------------+| User:' cactiuser ' @ '% '; ||

Working on MySQLMysql>create database du;Mysql>grant all on du.* to ' Benet ' @ ' 192.168.1.3 ' identified by ' 123 'Mysql>flush privileges; Refresh PermissionsWorking on the Web[[email protected] ~]#/usr/local/nginx/sbin/nginx-v//See which modules

System: Win8 64-bitMySQL 5.7 32The original project was debug 32-bit compiledLater changed to release 64-bit result compilation yes, external symbols that cannot be resolved when the connection is made.Workaround:1 Download x64-bit DLL, lib file

1. Create a function1 CREATEFUNCTIONFactorial (nDECIMAL(3,0))      2 RETURNSDECIMAL( -,0)3 Deterministic4 BEGIN  5DECLAREFactorialDECIMAL( -,0)DEFAULT1;6DECLARECounterDECIMAL(3,0);7SETCounter=N; 8 factorial_loop:repeat9

View the version of the database serverSelect version ();Create a databaseCreate DATABASE dbname Character_set=utf8 collate=utf8_general_ciDeleting a databaseDrop Database dbname;Select the database to useMysql>use dbname;View the table names that

All data is stored in binary form in the calculation, whereas a 8-bit binary number represents 1 bytes.Usually we say how many bytes a data type is, which means that the data type can represent how many bits of binary number, and the binary number

The InnoDB engine is currently using the following steps to perform DDL:1 Create a new non-visible temporary table (tmp_table) According to the table structure and DDL statements of the original table (original_table)2 Add write lock on the original

1, the query results in the useful data with a delimiter to obtain, updated to another table.DELIMITER $$ DROP function IF EXISTS ' func_splitstring ' $$ CREATE FUNCTION ' func_splitstring ' (f_string varchar (+), F_delimiter varchar (5), F_

MySQL error writing file \ ' xxx\ ' (errcode:28) for a number of reasons, let me summarize some common reasons for causing errcode:28 errors and solutions.Problem one, is the log log too large also causes the MySQL prompt error writing file ' xxx ' (

Windows:Way one uses symbolic connectionsFirst: Ensure that the D:\data\foo directory exists, if not created or you c:\mysql\data below, cut it, of course, in the case of stop MySQL move, otherwise it will not play any role. Again: In the

Mysqldump Backup for MySQLFrom MySQL technology insider InnoDB storage Engine--single-transaction: Valid only for InnoDB tables--lock-tables: The MyISAM table is used, but for the InnoDB table does not need this parameter, with the

What is definer in MySQL and what is the role?We will define a definer= ' xxx ' when MySQL creates view, trigger, function, procedure, event, similar to the following:CREATEalgorithm=UNDEFINED Definer=' Root ' @ '%`SQL SECURITY DefinerVIEW' V_

1. CREATE ROUTINE1 GRANT CREATE ROUTINE 2 on Database - * 3 to User (s) 4 [withGRANT OPTION]Create routine creates stored procedures and functions, and you can create views and tables. Now the built-in root has this permission, while