add mysql basic

cspell_dict_bash.txt

@@ -496,4 +496,9 @@ strconv
 RGBA
 rect
 pbqr
-penpxrq
+penpxrq
+Goroutines
+
+mysqladmin
+devel
+mariadb

docs/source/reference/database/mysql/mysql-basic.md

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+# MySQL Basic
+
+A popular open source DBMS.
+
+* bought by Oracle
+* has open-source fork MariaDB
+
+## Common Packages
+
+```bash
+mysql
+mysql-sever
+mysql-devel
+
+mariadb-server
+```
+
+secure
+
+```bash
+sudo mysql_secure_installation
+```
+
+## Files
+
+Config file
+
+* e.g. can change the location of database files
+
+```bash
+/etc/my.cnf
+```
+
+Database files
+
+* each directory represents a database with the same name
+* has some databases by default, like `mysql` and `test`
+
+```bash
+/var/lib/mysql/
+```
+
+Log
+
+```bash
+/var/log/mysqld.log
+```
+
+## Network
+
+MySQL uses TCP protocol.
+
+The default port is 3306.
+
+## Basic Commands
+
+Use `mysqladmin`
+
+* if password is omitted, will prompt user to input later
+
+```bash
+mysqladmin -u root -p <some-password> <some-commend>
+mysqladmin --user=root --password=<some-old-password> password "some-new-password" # change password
+
+mysqldump -R some_db > dump
+```
+
+Connect to local mysql server
+
+* -u user
+* -p login using password
+* -h specify host
+
+```bash
+mysql -u <some-user-name> -p
+> input your password
+
+mysql -h 192.168.1.1 -u root -p
+```
+
+Cannot login unless `sudo`?
+
+[ERROR 1698 (28000): Access denied for user 'root'@'localhost'](https://stackoverflow.com/questions/39281594/error-1698-28000-access-denied-for-user-rootlocalhost)
+
+Log out mysql shell
+
+```sql
+mysql>
+mysql> quit
+```
+
+Sample queries
+
+```sql
+SELECT VERSION();
+SELECT CURRENT_DATE;
+
+SELECT VERSION(), CURRENT_DATE\g
+SELECT VERSION(), CURRENT_DATE\G
+
+SELECT 4+4;
+```
+
+Databases commands
+
+```sql
+SHOW DATABASES;
+USE some_database;
+
+CREATE DATABASE some_database;
+DROP DATABASE some_database;
+```
+
+[About renaming database](https://stackoverflow.com/questions/67093/how-do-i-quickly-rename-a-mysql-database-change-schema-name)