MySQL

When doing an e-commerce project, when adding goods, add the product involves the picture table and the Minimum Sales Unit table, the two tables have the Product ID, add the picture and the smallest sales unit, to first return the product ID. The

PHP low-level programming of the brothers to see this problem, I made the following statement, I hope to be able to objectively understand the advantages and disadvantages of this enum field:Fat Brother View:Enum has advantages. But personally feel .

How do I get random numbers in a data range via MySQL?MySQL itself provides a function called Rand, which returns a V range of 0 The MySQL document that describes this function also describes the way that can be calculated by this formula floor (i +

MySQL is divided into regular users and root users. These two types of users have different permissions.First, the Authority tableWhen you install MySQL, a database named MySQL is automatically installed. The MySQL database is stored in the

When you take over a MySQL database management, you first need to look at the version of the MySQL database that you maintain, and when the developer asks you about the MySQL database version, and you forget it, you also need to look at the MySQL

MySQL Status View qps/tps/cache Hit rate view running MySQL Status View   monitor running MySQL, one way is to view MySQL running status.    (1) QPS (query amount per second)  qps = Questions (or Queries)/seconds mysql > show  global  status Like '

1. The error message is as follows:Last_sql_error:error ' Can ' t drop database ' Oldboy '; Database doesn ' t exist ' on query. Default database: ' Oldboy '. Query: ' Drop database Oldboy 'Replicate_ignore_server_ids:Master_server_id:11 row in Set (

A. mysql table structure:The data type of the Member_price column is float (20,2) (Note: Maximum 20-bit floating-point number, 2-bit precision )Insert Record:INSERT into ' member_price ' (' id ', ' data_type ', ' month ', ' member_count ', '

Production system with the growth of business will always go through a business volume from small to large process, scalability is considered a database system high availability of an important indicator; When the single table/database data volume

IntroductionThe PHP development environment should not be a difficult thing for every phper, like breathing. Below I teach you how to build PHP environment, is also a summary of my own, I hope to work with you to improve. (I hope you share, don't

RDS realizes read-write separation via Mysql-porxyIf your application SQL has process processing, then this scenario is not feasible, and this scenario is limited to read-write separation of SQL without process daemon.1. The machine where MySQL is

MySQL replication Problem of the last one, on the two-way synchronous replication architecture design of some design points and constraints.Problems and constraintsThe two-master double-write and bidirectional synchronization scenarios of the

[MySQL]# Set the MySQL client default character set#default-character-set=utf8Default-character-set=gbk[Mysqld]#设置3306端口Port = 3306# set up the MySQL installation directoryBasedir=d:\install\mysql\mysql-5.6.27-winx64# Set up a storage directory for

first, start and close the MySQL servicewindows under Start (Method 1) Administrator rights into CMD, execute net start MySQL (Method 2) Administrator rights into CMD, execute mysqld-uroot--console (Method 3) in the computer--service--mysql, through

First we use the new API method to connect MySQL load data to create DFImportOrg.apache.spark.sql.DataFrameImportOrg.apache.spark. {sparkcontext, sparkconf}ImportOrg.apache.spark.sql. {savemode,

Want to upload a picture, can the foreground with input type= ' file ' name= ' file ', backstage with something like $_post $_files[' file ' to receive, $_files this thing is also a super global variable, there is [' name '],[' size '] these

1. Description of the problemin the Report development tool Finereport, the MySQL database connection through the data connection encoding conversion to encode the conversion, in the report input to the database input Chinese data, always appear

Mysqlbinlog parsing binlog garbled issue decryption The binlog of mysql database is garbled as follows: Binlog'Ixzqvhniaaaalqaaagcbaaaaahoaaaaaeabhrlc3qaano0aaedaabuocnyIxzqvh5iaaaakaaaai8baaaaahoaaaaaeaagab // 4 BAAAAcu + UpA =. If you use-v to

Compile a shell script in CentOS to monitor MySQL master-slave replication, Objective: To regularly monitor whether the MySQL master-slave database is synchronized. If not, record the fault time and execute commands to restore the master-slave

Why does MySQL rollback cause an increase in ibd files?A simple test: start transaction; insert into tb1 values (3, repeat ('A', 65000), 'x', 1); -- commit; rollback; these are the size of the files after rollback before tb1.ibd is inserted and