Intro to MySQL MySQL (Windows) MySQL (Ubuntu Desktop) MySQL...

DBMS : 1: Intro to MySQL

2: MySQL (Windows)

3: MySQL (Ubuntu Desktop)

4: MySQL (CentOS Server)

5: Tuning MySQL (Linux)

DBMS

part 1/5: Intro to MySQL

1. Intro to

• MySQL is the world's most popular open source database

– used by high profile web properties including Facebook, Twitter, YouTube, Yahoo! and many more

– Oracle drives MySQL innovation, delivering new capabilities to power next generation web, cloud, mobile and embedded applications

Spring 3 Junqiang Jimmy Liu

1. Intro to

• https://www.mysql.com/

• A variety of Editions: MySQL Enterprise Edition MySQL Cluster CGE MySQL Community Edition

• https://www.oracle.com/

• Oracle Database (19c)

• Java


https://www.mysql.com/

https://www.oracle.com/

DBMS

part 2/5: MySQL (Windows)

2.1 MySQL

– MySQL in Windows (5.5.20)

• MySQL database server (engine)

• MySQL Client (command line)

• MySQL Workbench 5.2.44 (GUI)


2.2 Installing MySQL

in Windows

• mysql-5.5.20-win32.msi

– MySQL database server (engine)

– MySQL Client (command line)


mysql-5.5.20 : MySQL Server Instance Configuration

• Usage: Mutlifunctional, Transactional only, Non-transactional

• InnoDB Tablespace Settings: physical location

• Approximate number of concurrent connections: OLAP, OLTP, Manual Setting

• Enable TCP/IP Networking: Port 3306

• Enable Strict Mode

• Default Character Set: Standard, Multilingualism

• Install As Windows Service with Name: MySQL

• Security - New root password: 123456


MySQL Workbench 5.2.44

• mysql-workbench-gpl-5.2.44-win32.msi

– MySQL Workbench 5.2.44 (GUI)

• Download prerequisites (as prompt)

– MySQL Workbench requires to be installed

• the Visual C++ 2010 Redistributable Package

• The .Net Framework 4.0


2.3 Start MySQL engine

• In Windows

– As a windows service (automatically start yes/no)

– Or, MySQL Workbench


DBMS

part 3/5: MySQL (Ubuntu Desktop)

3.1 MySQL in Ubuntu Desktop

– in Ubuntu Desktop (5.1.66)

• MySQL database server (engine)

• MySQL Client (mysql -u root -p) (command line)

• MySQL Navigator

• MySQL Administrator

• MySQL Query Browser


3.2 Installing MySQL

Search and install by “Software Center”

in Ubuntu Desktop

• MySQL Sever

• MySQL Client

• MySQL Administrator

• MySQL Query Browser

• MySQL Navigator


3.3 starting MySQL

• By GUI: MySQL Administrator

Server Hostname, user, password

• Tuning

• by command line (see next section)


3.4 using MySQL

• By GUI: MySQL Query Browser

– Executing any SQL statement in the browser

– show databases;

– show tables;

• by command line (see next section)


DBMS

part 4/5: MySQL (CentOS Server)

4.1 Install MySQL in command line

Initial (default) installation by command line only

yum install mysql-server • mysql-5.1.73-3.e16_5.x86-64.rpm

• mysql-libs-5.1.73-3.e16_5.x86-64.rpm

• mysql-server-5.1.73-3.e16_5.x86-64.rpm

• openssl-1.0.1e-30.e16.contos.9.x86-64

• perl-DBD-MySQL-4.013.e16.x86-64.rpm

Spring Junqiang Jimmy Liu 17

Setting up after initial (default) installation

• service mysqld start

• mysql_secure_installation – Current password for root (blank at the first time)

– Set root password : Y

– New password: 123456

– Remove anonymous users? [Y/n] n

– Disallow root login remotely ? [Y/n] n

• service mysqld stop


4.2 Start MySQL in command line

start the engine by command line only

• service mysqld start

• mysql –u root -p



Another command line only

• mysqld_safe --verbose

• mysqld_safe --bind-address=172.31.100.203

Messages:

mysqld_safe Logging to syslog.

mysqld_safe Starting mysqld daemon with dbs from /var/lib/mysql


mysqld_safe options

--verbose

--help

--bind-address=name IP address to bind to.

--master-password=name

--master-port=#

--port=#

my.cnf, $MYSQL_TCP_PORT, /etc/services, 3306(default)


4.3 Stop MySQL in command line


• mysqladmin -u root -p -f --verbose shutdown

• mysqladmin --user=root shutdown --password=xxxxx


4.4 Manage and Use MySQL

to check if mysql is running:

• mysqladmin -u root -p status

show you can retrieve data from the server:

• mysqlshow -u root -p

• mysqlshow -u root -p dbname


• Help in a terminal

man mysql

mysql –help

• Get into MySQL:

mysql –u user -p –h hostname dbname

mysql --user=xxxx --password=xxxxxx -e “sqlstmt;”

• Get out MySQL:

quit or exit Spring 24 Junqiang Jimmy Liu

DBMS

part 5/5: Tuning MySQL (Linux)

Across machines


5.1 Host IP

• Error connecting to a server – com.mysql.jdbc.CommunicationsException:

Communications link failure due to underlying exception

– java.net.SocketException MESSAGE: java.net.ConnectException: Connection refused: connect

• Fix:

– specifiying the host IP of the server either in my.cnf

– Or, as an option when start the server

mysqld_safe --bind-address=172.31.100.203


5.2 Firewall vs. Port

Possible connection rejection due to firewall,

please allow access to the port (default 3306)

• CentOS - adding entries into iptables

– iptables -A INPUT -i eth0 -p tcp --dport 3306 …

– …

• Ubuntu

– sudo ufw allow 3306


Disable the whole firewall

• service iptables stop

make it permanent

• chkconfig iptables off


5.3 Allow remote users

• grant all on *.* to ‘root’@’172.31.100.202’ identified by ‘123456’;

Recorded as a row in mysql.user so that a user

at 172.31.100.202 can access the server as root

or

When trying connection from 172.31.100.202, got:

• Host ... is not allowed to connect to this MySQL server

• Access denied for user ‘root’ @ ‘172.31.100.202’


5.4 Globalization : Character Set

• Start up options

– --character-set-client-handshake

– --character-set-filesystem=name

– --character-set-server=charset_name

– --collation-server=collation_name

• To know options,

– show variables like 'ch…';

• Option file


Charset/collation at client side

• SET NAMES 'charset_name' [COLLATE’collaiton_name'];

• Good 4 client-side (either at a terminal or a GUI)

• SET NAMES 'utf8'; equivalent to

– SET character_set_client='utf8';

– SET character_set_results='utf8';

– SET character_set_connection='utf8';


Four levels of charset/collation (Server, Database, Table, Column)

• The simplest way is to specify the default charset (and collation) when creating a database, a table, a column instead of specifying system variables in the option file or the options of starting up the server.

• Examples Good 4 server-side (either at a terminal or a GUI)

– create table chch (chch varchar(20)) charset 'utf8';

– alter database FacilitiesOnLine charset 'utf8';

– alter database FacilitiesOnLine character set 'utf8';


5.5 related conf files

• /etc/my.cnf • /etc/mysql/my.cnf the server configuration file. • /usr/etc/my.cnf • ~/.my.cnf bind-address = 127.0.0.1 port = 3306 • /etc/mysql/debian.cnf

• /var/run/mysqld/mysqld.sock socket file !!! • /var/lib/mysql/ubuntu.pid pid file !!!

• /etc/init.d/mysql

• /etc/hosts


DB and DBMS

Uniform Java API Specific driver for individual DBMS

Client (command line)

GUI


Intro to MySQL MySQL (Windows) MySQL (Ubuntu Desktop) MySQL...

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