MySQL/MariaDB Reference

• List Databases

 mysql> show databases;

• List Tables

 mysql> show tables;

• Change Passwords

 # mysqladmin -u root password 'new-password'

Note: the mysqladmin command should be run from a shell script, so as to not have this critical password exposed in the command history - make sure to delete the shell script after running

• Delete Database

 mysql> drop database test;

• Creating a new DB and assigning permissions

Command line/scripted

 # mysqladmin -p create wikidb
 # echo "grant index, create, select, insert, update, delete, alter, lock tables on wikidb.* to 'wikiuser'@'localhost' identified by 'password';" | mysql -p

Note: the echo command should be run from a shell script, so as to not have a critical password exposed in the command history - make sure to delete the shell script after running

mySQL command line - note: this is added to the mysql command history (not a good idea to leave the password exposed):

 # mysql -p
 mysql> create database wikidb;
 mysql> grant index, create, select, insert, update, delete, alter, lock tables on wikidb.* to 'wikiuser'@'localhost' identified by 'password';

• Table Structure

describe SystemEvents;

• View Data (Some Query Examples)

select * from user;
select Host,User,Grant_priv from user;
select * from SystemEvents where SysLogTag='CROND';
select * from SystemEvents limit 5;
select * from SystemEvents where SysLogTag like '%[%' limit 5; 

• Modify Data

update SystemEvents set SysLogTag='CROND:' where SysLogTag='CROND';
update SystemEvents set SysLogTag='sshd:' where SysLogTag like 'sshd[%';

• Delete From Table