MySQL

Recently in the MySQL batch data test, simply summarize the problems encountered:First I was simply writing a MySQL loop to insert data into the SP, as follows:This is the process of inserting 100W data and results, you can see that the 55min +20s

method One: Directly run the command export PATH= $PATH:/usr/local/webserver/php/bin and Export path= $PATH:/usr/local/webserver/mysql/ ~/.bash_profile Modify the PATH line in the file, adding/usr/local/webserver/php/bin

REM *******************************code start*****************************@echo offSet "ymd=%date:~,4%%date:~5,2%%date:~8,2%"MD D:\xl\%Ymd%D:\xampp\mysql\bin\mysqldump.exe-u yunwei-p123456-h 192.168.10.176 Zentao--default-character-set=utf8--opt-q-R-

In different versions of MySQL, many of the features and syntax may not be the same, how can we know the current installation version of the syntax? In fact, MySQL comes with a set of help for us to use. We can look at the layers.Enter the command

Write in front: indexes have a critical impact on the speed of queries, and understanding indexes is also a starting point for database Performance tuning. Consider the following scenario, assuming that a table in the database has 10^6 records, the

In my study of hibernate, I encountered an error: The JUnit test passed, but the database did not create a table, the console error message is as follows:HHH000388:Unsuccessful:create table T_user (user_id bigint not NULL auto_increment, Card_number

The Explian command can display the execution plan of the SELECT statementEach row in the result of explain corresponds to a table in the SELECT statement, and the order in the output is the order in which the tables are processed by the statement.

Binary log-related server variables:Sql_log_bin = {on| OFF} whether to log binary logs. Enable binary logging, this must be onSometimes, we want to execute some of the statements do not sync to slave, you can execute set Sql_log_bin=off, temporarily

Grant Replication Slave on * * to [e-mail protected] ' IP ' identified by ' xxx ';Flush privileges;Change Master to master_host= ' 192.168.1.103 ', master_port=3306,master_user= ' repl ', master_password= ' ffffff ', master_ Auto_position=1;Start

Reference http://www.linuxidc.com/Linux/2016-04/130436.htmEnvironment:Zabbix sever:192.168.234.131mysql:192.168.234.130MySQL Client operation:1 Add monitoring users, log in to the data and then:GRANT USAGE on *. Zabbix ' @ ' localhost ' identified

DescriptionA MySQL database server on the line suddenly loses power, causing a system failure to start, and after reinstalling the system, locate the previous MySQL database folder.Problem:Restore the previous MySQL database by copying the file,

I just started sending random passwords that made me sick.Finally, with the help of the great God, the reset of the password was completed, and the following is the method of the great God.Http://dev.mysql.com/doc/refman/5.7/en/resetting-permissions.

MySQL Duplicate data insertionReplace into t (ID, Update_time) VALUES (1, now ());OrReplace into t (ID, update_time) Select 1, now ();MySQL replace into has three different forms:1. Replace into Tbl_name (col_name, ...) VALUES (...)2. Replace into

The current mainstream database is typically MySQL, SQL Server, Oracle. Sometimes we forget the database password when we have to do, to crack someone else's database password when we doIt's a headache to forget your password.1, First we have to

Error log the log service started offQuerying logs query log Normal query log General query log client link and SQL Slow query log slow query log execution time exceeds specified value Binary log binary logs information about the

The event scheduler in MySQL is a new feature after MySQL 5.1. The database can be made, added, deleted, modified and manipulated in accordance with the specified time period. Equivalent to the unmanned scheduler in Linux crontab ( For the operation

Install MySQL using yum under Linux 1, installation view has been installed:           yum list installed mysql*           rpm-qa | grep mysql*  See if there is an installation package:           yum list mysql*  Install MySQL client:           yum

MySQL trigger, mysql trigger instance MySQL versions 5.0.2 and later support triggers. A trigger has some time with commands to trigger certain operations.Events include insert statements, delete statements, and update statements..Triggers can be

Basic concepts and architecture of Mysql Databases Database 1. Key: The primary key is the flag column in the table. A key may consist of several columns. You can use keys as references between tables.   CustomerID is the primary key of the MERs

Mariadb DML statement and user authorization, mariadbdml DML (Data Manipulation Language): INSERT, DELETE, UPDATE, SELECT INSERT [INTO] tbl_name [(col1,...)] {VALUES | VALUE} (val1 ,...),(...),...   Suppose there is a table above Insert a row of