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Print defaults for the current client connection $ my_print_defaults client mysql --port=3306 --socket=/tmp/mysql.sock --no-auto-rehash Note, for client connections, you can put setting in the user's .my.cnf file. ... Read more..

Creating tables in databases is the  first step to store your data To create a table you must describe the columns and their atributes. We will create a table to hold contact information with four columns: contact_id, name, email, and birthdate. contact_id column =  integer number that is 20 decimal places long ( it is created with an INT(20) datatype). name column holds the full name of a contact, which we  will will set be no longer than 50 characters long, so the ... Read more..

Remove duplicate entries. Assume the following table and data. CREATE TABLE IF NOT EXISTS dupTest ( pkey int(11) NOT NULL auto_increment, a int, ... Read more..

If you want to change the  max_allowed_packet fast, without modifying any confis or restart mysql ? Follow this howto : mysql> show variables like 'max%' ; +-----------------------+------------+ | Variable_name | Value | +-----------------------+------------+ | max_allowed_packet | 1048576 | ... mysql> set max_allowed_packet = 1500000; Query OK, 0 rows affected (0.03 sec) mysql> show variables like 'max%' ; +-----------------------+------------+ | Variable_name | Value ... Read more..

Can the order of the columns in a create statement make a difference? YES create table t ( a int, b int, timeUpdate timestamp, timeEnter timestamp ); The first timestamp will always be the "automatically ... Read more..

If you use  innodb tables and foreign key constraints, importing a mysqldump may generate foreign key errors. To resolve this issue please read on : At the beginning of the dump file add this : SET FOREIGN_KEY_CHECKS=0; At the end of the dump file add this : SET FOREIGN_KEY_CHECKS=1; This will disable foreign key checks for the mysqldump import session only. This will allow the data to be imported without the error being generated. Read more..

This is how to change the name of an existing table tableone to tabletwo : RENAME TABLE  tableone TO tabletwo;  Note : you must issue this command with an user that has the correct priviledges Read more..

You can use mysql to import directly a csv file . You do not need to make a script to do this anymore From an Excel file , you need to export it as CSV ,  Remove the CSV Headers and the Excel data  from the file ,  and after that it can be inserted in MySql Here is an example : load data local infile 'your.csv' into table tblUniq fields terminated by ',' enclosed by '"' lines terminated by '\n' (yourName, yourCity, yourComments) Read more..

Show status information on a table. Note, if the database was started with --safe-show-database or --skip-show-database some of these commands may not work. Note the "\G" option may provide a nicer format. Show the create statement: mysql> show create table dupTest\G ... Read more..

Log in MySql To create a database called 'yourdatabase' use the following SQL command: create database yourdatabase; Read more..

Clean up binary log files. For a default install they may be in /usr/local/var/ or /var/lib/mysql/ with names ending in -bin.000001,-bin.000002,.. The following command may help find out where the logs are located. mysql> show variables like '%home%'; ... Read more..

This is how to remove a table from a MySQL database, and remove all of its data, use the following SQL command: 1.  log in mysql 2.  issue command : use yourdatabase;  3. issue command : drop table if exists yourtable; The last command will delete the database if it exists , it is usefull because if it does not exist it will not output any error Read more..

To increment or decrement and existing number in a table (you do not need to read the value first)  please read on : Increment the value 'timer' by one for the row in table 'movies' where 'movie_id' is '24', use: UPDATE movies SET timer=timer+1 WHERE movie_id=24 Note  to decrement use timer=timer-1 Enjoy Read more..

Find out who is doing what, and kill the process if needed. This example kills Id 657. mysql> show processlist; show processlist; +-----+------+-----------+---------+---------+-------+-------+------------------+ | Id | User | Host | db | Command | Time | State | Info | ... Read more..

Recovering / Changing Your MySQL Root Password Sometimes you may have to recover the MySQL root password because it was either forgotten or misplaced. The steps you need are: 1) Stop MySQL [root@bigboy tmp]# service mysqld stop Stopping MySQL:  [  OK  ] [root@bigboy tmp]# 2) Start MySQL in Safe mode with the mysqld_safe command and tell it not to read the grant tables with all the MySQL database passwords. [root@bigboy tmp]# mysqld_safe --skip-grant-tables --skip-networking & [1] 13007 [root@bigboy tmp]# Starting mysqld daemon with databases from /var/lib/mysql [root@bigboy tmp]# Note: In Fedora ... Read more..

Transactions: Not all table types support transactions. BDB and INNODB type do support transactions. Assuming the server has NOT been started with --skip-bdb or --skip-innodb the following should work: mysql> create table tran_test (a int, b int) type = InnoDB; mysql> begin; mysql> insert into tran_test (a,b) values (1,2); ... Read more..

This is how to create a user youruser with password YourPassword  and grant them full access to the  database named yourdatabase, connect to the database with mysql and issue the command: grant all on yourdatabase.* to user@localhost identified by 'YourPassword'; Read more..

Monitor port 3306: tcpdump -i eth0 -nN -vvv -xX -s 1500 port 3306 and host not 192.168.1.102 The -s is length of each packet. This monitors all traffic on port 3306 excluding the good client 192.168.1.102. The out will be in the following format: [root@third-fl-71 root]# tcpdump -i eth0 -nN -vvv -xX -s 1500 port ... Read more..

This is how to list the databases that exist in a MySQL server, use the 'show databases' SQL command: show databases; +------------------+ | Database                | +------------------+ | database1              | | mysql                     | | test                         | +------------------+ It will display all the databases your user has access to Read more..

MySQL Replace(), here's the syntax. update [table_name] set [field_name] = replace([field_name],'[string_to_find]','[string_to_replace]'); Read more..