# mysql -h localhost -u root
# mysql -h localhost
# mysql -u root
# mysql

rootのパスワードを変える

mysql> SET PASSWORD FOR 'root'@'localhost'=PASSWORD('newPassword');

匿名ユーザーを削除する

mysql> DELETE FROM mysql.user WHERE user='';

mysql> grant all privileges on *.* to 'userName'@'%'identified by 'newPassword';

mysql> grant all privileges on *.* to 'userName'@'localhost' identified by 'newPassword';

ykaccデータベースのaccテーブルのみ書き換えできるユーザー

mysql> grant insert on ykacc.acc to 'userName'@'localhost' identified by 'newPassword';

特定のカラムだけ閲覧できるユーザー

mysql> GRANT SELECT (price) ON ykacc.pro TO 'test'@'localhost';

このユーザーをshowコマンドで見ると次のようになっている。

mysql> show grants for 'test'@'localhost';
+-------------------------------------------------------------+
| Grants for test@localhost |
+-------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'test'@'localhost' |
| GRANT SELECT (price) ON `ykacc`.`pro` TO 'test'@'localhost' |
+-------------------------------------------------------------+
2 rows in set (0.00 sec)

ユーザーの権限を見る

mysql> show grants for 'userName'@'localhost';

ユーザーを削除する (4.1ではいきなりdrop文が使えないので次の手順に従う)

mysql> REVOKE all on *.* from 'userName'@'localhost'; <---最初にユーザーの権限を剥奪する
mysql> DROP USER 'userName'@'localhost';

登録したユーザーを見る

mysql> select host,user,password from mysql.user;

[root@vsp root]# ps axf | grep mysqld

or

[root@vsp root]# mysqladmin -uroot ping

or

[westhost][~]$ mysqladmin version

or

[westhost][~]$ mysqladmin variables

[root@vsp root]# /etc/rc.d/init.d/mysqld restart

データベースを作る。

mysql> CREATE DATABASE bank;

作業するデータベースを選択する。

mysql> USE bank;
Database changed

テーブルを作る。

mysql> CREATE TABLE customer
(name_f VARCHAR(16) CHARACTER SET utf8,
id_f INT
);

データベースの一覧を見る。

mysql> SHOW DATABASES;

テーブルの一覧を見る。(USE bank;の後、)

mysql> SHOW TABLES;

テーブルのカラム名とデータ型を見る。

mysql> SHOW COLUMNS FROM customer;

mysql> show create table t \G
*************************** 1. row ***************************
Table: t
Create Table: CREATE TABLE `t` (
`name` varchar(10) character set utf8 default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1

mysql> show create table t \G
*************************** 1. row ***************************
Table: t
Create Table: CREATE TABLE `t` (
`name` varchar(10) default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1

Example 1 Apollo

Connection id: 135
Current database:
Current user: root@localhost
Current pager: stdout
Using outfile: ''
Server version: 3.23.58
Protocol version: 10
Connection: Localhost via UNIX socket
Client characterset: latin1
Server characterset: latin1
UNIX socket: /var/lib/mysql/mysql.sock
Uptime: 2 days 10 hours 47 min 30 sec

Threads: 1 Questions: 473 Slow queries: 0 Opens: 14 Flush tables: 1 Open tables: 8 Queries per second avg: 0.002

[mysql.server]
user=mysql
basedir=/var/lib

[safe_mysqld]
err-log=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[root@ki root]#

Example 2 VPS

Connection id: 1938
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Server version: 4.0.27-standard
Protocol version: 10
Connection: Localhost via UNIX socket
Client characterset: latin1
Server characterset: sjis
UNIX socket: /var/lib/mysql/mysql.sock
Uptime: 2 days 13 hours 54 min 19 sec

[mysql.server]
user=mysql
basedir=/var/lib

[safe_mysqld]
err-log=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
root@vps [~]#

Example 3

Connection id: 31
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: more
Using outfile: ''
Using delimiter: ;
Server version: 4.1.19
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: ujis
Db characterset: ujis
Client characterset: ujis
Conn. characterset: ujis
UNIX socket: /tmp/mysql.sock
Uptime: 14 hours 48 min 3 sec

default-character-set = ujis

[client]
default-character-set = ujis

[mysqldump]
default-character-set = ujis

[mysql]
default-character-set = ujis

Example 4 WestHosting

Connection id: 3
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: less
Using outfile: ''
Using delimiter: ;
Server version: 4.1.9-standard-log
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: latin1
Client characterset: latin1
Conn. characterset: latin1
UNIX socket: /var/lib/mysql/mysql.sock
Uptime: 37 min 37 sec

Example 5 A2 Hosting

Connection id: 247613
Current database:
Current user: twinknob@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 4.1.20-standard
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: latin1
Client characterset: latin1
Conn. characterset: latin1
UNIX socket: /var/lib/mysql/mysql.sock
Uptime: 4 days 21 hours 1 min 19 sec

Threads: 5 Questions: 6996524 Slow queries: 1 Opens: 41066 Flush tables: 1 Open tables: 256 Queries per second avg: 16.608

twinknob
bodegefr

# The following options will be passed to all MySQL clients
[client]
#password = your_password
port = 3306
socket = /var/lib/mysql/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
port = 3306
socket = /var/lib/mysql/mysql.sock
skip-locking
key_buffer = 256M
max_allowed_packet = 1M
table_cache = 256
sort_buffer_size = 8M
read_buffer_size = 2M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache = 8
query_cache_size= 32M
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 4
set-variable = max_connections=350
safe-show-database
log-error=/var/log/mysql.error.log
log-warnings
ft_min_word_len=3
wait_timeout=300
connect_timeout=300

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking

# Replication Master Server (default)
# binary logging is required for replication
#log-bin

# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id = 1

# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
# the syntax is:
#
# CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
# MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
# where you replace <host>, <user>, <password> by quoted strings and
# <port> by the master's port number (3306 by default).
#
# Example:
#
# CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
# MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
# start replication for the first time (even unsuccessfully, for example
# if you mistyped the password in master-password and the slave fails to
# connect), the slave will create a master.info file, and any later
# change in this file to the variables' values below will be ignored and
# overridden by the content of the master.info file, unless you shutdown
# the slave server, delete master.info and restart the slaver server.
# For that reason, you may want to leave the lines below untouched
# (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id = 2
#
# The replication master for this slave - required
#master-host = <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user = <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password = <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port = <port>
#
# binary logging - not required for slaves, but recommended
#log-bin

# Point the following paths to different dedicated disks
#tmpdir = /tmp/
#log-update = /path-to-dedicated-directory/hostname

# Uncomment the following if you are using BDB tables
#bdb_cache_size = 64M
#bdb_max_lock = 100000

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /var/lib/mysql/
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /var/lib/mysql/
#innodb_log_arch_dir = /var/lib/mysql/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 256M
#innodb_additional_mem_pool_size = 20M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 64M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
connect_timeout=200

[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout
twinknob@a2s11 [~]#

Example 6 West Host

[fjapan][~]$ cat /etc/my.cnf
[client]
password = 1458Sa
port = 3306
user = root
socket = /var/lib/mysql/mysql.sock

[mysqld]
port = 3306
user = fjapan
bind-address = 208.131.134.96
socket = /var/lib/mysql/mysql.sock
pid-file = /var/run/mysqld/mysqld.pid
skip-locking
skip-innodb
#Added by HostDirector Plugin Installer -- Don't remove -- begin
#skip-networking
#Added by HostDirector Plugin Installer -- Don't remove -- end
set-variable = key_buffer=16M
set-variable = max_allowed_packet=1M
set-variable = thread_stack=128K
log = /dev/null

[mysqldump]
quick
set-variable = max_allowed_packet=16M

[mysql]
no-auto-rehash

[isamchk]
set-variable = key_buffer=16M

ルートユーザーのパスワードの変更

% passwd root <Enter>
Changing local password for root.
New password:変更後の新しいパスワードを入力 <Enter>
Retype new password:確認のため新パスワードを再入力 <Enter>
passwd: updating the database...
passwd: done ←パスワードの変更完了メッセージ

ルート権限で、一般ユーザのパスワードを変更する

% passwd servit <Enter>
Changing local password for servit.
New password:新しいパスワードを入力 <Enter>
Retype new password:確認のため新しいパスワードを再入力 <Enter>
passwd: updating the database...
passwd: done ←パスワードの変更完了メッセージ

SUコマンドの使い方

% Admin ~> su root <Enter>
Password:ルートユーザパスワードを入力 <Enter>
↑入力するパスワードは画面上には表示されませんが、認識されている。

% Admin /home/Admin#

ここで、ユーザ確認に「whoami」コマンドを入力してみる。

% Admin /home/Admin# whoami <Enter>
root
↑ルートユーザにユーザ変更が完了している

特定ユーザーによるMySQLへのログイン

% Admin#　mysql -u root -p
Password:ルートユーザパスワードを入力 <Enter>
↑入力するパスワードは画面上には表示されないが、認識されている。

mysql> とプロンプトが出れば成功。