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MySQL Recover Root Password

To reset a forgotten mysql root password you have to start MySQL by bypassing all privileges and reset the root password. It is highly suggest you do this in single user mode, since it is still possible for every user to access the mysql.sock, if you haven't changed privileges. What you should do:

/etc/init.d/mysql stop
/usr/bin/mysqld_safe --skip-grant-tables --skip-networking &
mysql -u root
use mysql;
UPDATE user SET Password=PASSWORD("your password here") WHERE User="root";
# kill all the mysql processes
/etc/init.d/mysql stop
# Start MySQL again
/etc/init.d/mysql start
Handy MySQL Commands
Description Command
To login (from unix shell) use -h only if needed. [mysql dir]/bin/mysql -h hostname -u root -p
Create a database on the sql server. create database [databasename];
List all databases on the sql server. show databases;
Switch to a database. use [db name];
To see all the tables in the db. show tables;
To see database's field formats. describe [table name];
To delete a db. drop database [database name];
To delete a table. drop table [table name];
Show all data in a table. SELECT * FROM [table name];
Returns the columns and column information pertaining to the designated table. show columns from [table name];
Show certain selected rows with the value “whatever”. SELECT * FROM [table name] WHERE [field name] = “whatever”;
Show all records containing the name “Bob” AND the phone number '3444444'. SELECT * FROM [table name] WHERE name = “Bob” AND phone_number = '3444444';
Show all records not containing the name “Bob” AND the phone number '3444444' order by the phone_number field. SELECT * FROM [table name] WHERE name != “Bob” AND phone_number = '3444444' order by phone_number;
Show all records starting with the letters 'bob' AND the phone number '3444444'. SELECT * FROM [table name] WHERE name like “Bob%” AND phone_number = '3444444';
Show unique records.SELECT DISTINCT [column name] FROM [table name];
Show selected records sorted in an ascending (asc) or descending (desc). SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC;
Count rows. SELECT COUNT(*) FROM [table name];
Switch to the mysql db. Create a new user. INSERT INTO [table name] (Host,User,Password) VALUES('%','user',PASSWORD('password'));
Change a users password.(from unix shell). [mysql dir]/bin/mysqladmin -u root -h -p password 'new-password'
Change a users password.(from MySQL prompt). SET PASSWORD FOR 'user'@'hostname' = PASSWORD('passwordhere');
Switch to mysql db.Give user privilages for a db. INSERT INTO [table name] (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv) VALUES ('%','db','user','Y','Y','Y','Y','Y','N');
To update info already in a table.UPDATE [table name] SET Select_priv = 'Y',Insert_priv = 'Y',Update_priv = 'Y' where [field name] = 'user';
Delete a row(s) from a table. DELETE from [table name] where [field name] = 'whatever';
Update database permissions/privilages. FLUSH PRIVILEGES;
Delete a column. alter table [table name] drop column [column name];
Add a new column to db. alter table [table name] add column [new column name] varchar (20);
Change column name. alter table [table name] change [old column name] [new column name] varchar (50);
Make a unique column so you get no dupes. alter table [table name] add unique ([column name]);
Make a column bigger. alter table [table name] modify [column name] VARCHAR(3);
Delete unique from table. alter table [table name] drop index [colmn name];
Load a CSV file into a table. LOAD DATA INFILE '/tmp/filename.csv' replace INTO TABLE [table name] FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' (field1,field2,field3);
Dump all databases for backup. Backup file is sql commands to recreate all db's. [mysql dir]/bin/mysqldump -u root -ppassword –opt >/tmp/alldatabases.sql
Dump one database for backup. [mysql dir]/bin/mysqldump -u username -ppassword –databases databasename >/tmp/databasename.sql
Dump a table from a database. [mysql dir]/bin/mysqldump -c -u username -ppassword databasename tablename > /tmp/databasename.tablename.sql
Restore database (or database table) from backup. [mysql dir]/bin/mysql -u username -ppassword databasename < /tmp/databasename.sql
Create Table Example 1. CREATE TABLE [table name] (firstname VARCHAR(20), middleinitial VARCHAR(3), lastname VARCHAR(35),suffix VARCHAR(3),officeid VARCHAR(10),userid VARCHAR(15),username VARCHAR(8),email VARCHAR(35),phone VARCHAR(25), groups VARCHAR(15),datestamp DATE,timestamp time,pgpemail VARCHAR(255));
Create Table Example 2. create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastname varchar(50) default 'bato');
handbook/handbook/mysql.txt · Last modified: 2010/04/15 21:18 (external edit)