{"id":2281,"date":"2013-07-12T15:31:47","date_gmt":"2013-07-12T07:31:47","guid":{"rendered":"http:\/\/rmohan.com\/?p=2281"},"modified":"2013-07-12T16:25:27","modified_gmt":"2013-07-12T08:25:27","slug":"mysql-database-in-linux","status":"publish","type":"post","link":"https:\/\/mohan.sg\/?p=2281","title":{"rendered":"Mysql DataBase in linux"},"content":{"rendered":"
We\u00a0 can check how to install mysql db in a linux machine<\/div>\n
All files of mysql including DB are stored in\u00a0\/var\/lib\/mysql\/<\/div>\n

 <\/p>\n

All configuration files are in\u00a0\/etc\/my.cnf<\/div>\n

 <\/p>\n

Install the package using yum<\/div>\n
# yum install mysql mysql-server<\/div>\n

 <\/p>\n

And then start the mysql server<\/div>\n
# service mysqld start<\/div>\n

 <\/p>\n

Here no root password set for the DB so any one can access the DB command<\/div>\n
# mysql<\/div>\n

 <\/p>\n

For securing it set a root password for mysql<\/div>\n
# mysqladmin -u root password ‘password’<\/div>\n

 <\/p>\n

this will set a root password for mysql. If you want to update the mysql root password the do the following<\/div>\n
# mysqladmin -u root -p’oldpassword’ password ‘newpassword’<\/div>\n

 <\/p>\n

Then to enter into mysql database run<\/div>\n
# mysql -u root -p<\/div>\n
enter password:<\/div>\n
<\/div>\n
or we can specify password after -p option but it will be visible to all<\/div>\n
<\/div>\n
Now your\u00a0 mysql data base is ready for operation with a default port of\u00a03306.<\/div>\n

 <\/p>\n

Some basic mysql queries are<\/div>\n
To list all databases on the mysql sql server<\/div>\n
mysql> show databases;<\/div>\n

 <\/p>\n

Create a database on the sql server<\/div>\n
mysql> create database [databasename];<\/div>\n

 <\/p>\n

To use a database<\/div>\n
mysql> use dbname;<\/div>\n

 <\/p>\n

To create a table in the database<\/div>\n
mysql> create table tablename(name varchar(20),dob int(20));<\/div>\n

 <\/p>\n

To see all the tables in the db<\/div>\n
mysql> show tables;<\/div>\n

 <\/p>\n

To drop a particular table<\/div>\n
mysql> drop table tablename;<\/div>\n

 <\/p>\n

To see the structure of a particular table<\/div>\n
mysql> describe employee;<\/div>\n
mysql> show columns from table-name;<\/div>\n

 <\/p>\n

Show all data in a table<\/div>\n
mysql> SELECT * FROM [table name];<\/div>\n

Granting\u00a0 Database permission to a user, * will give all default permissions
\n<\/b><\/p>\n

mysql> grant usage on *.* to ‘ctechz’@’localhost’ identified by ‘ctechz123’;<\/div>\n

 <\/p>\n

Granting\u00a0 particular permission to users,<\/div>\n
mysql> grant select,insert,update,delete,create,drop on TestDb.* to ‘ctechz’@’localhost’ identified by\u00a0 ‘ctechz123’;<\/div>\n

 <\/p>\n

Creating a user to access db<\/div>\n
mysql> create user ctechz identified by ‘ctechz123’;<\/div>\n

 <\/p>\n

To change the password for a user<\/div>\n
mysql> set password for ‘ctechz’@’localhost’=password(‘ctechz123’);<\/div>\n
\u00a0mysql> flush privileges;<\/div>\n

 <\/p>\n

Granting permission from any host<\/div>\n
mysql> GRANT ALL PRIVILEGES ON *.* TO ‘monty’@’%’ WITH GRANT OPTION;<\/div>\n

% means for all host<\/p>\n

We can get the mysql history file from<\/div>\n
\u00a0\u00a0# vim .mysql_history<\/div>\n
from the above file we can get the commands that we run the mysql bd.<\/p>\n
If you want to connect to a remote mysql server from your machine<\/div>\n

#\u00a0 mysql -uroot -p -h 192.168.1.245<\/p>\n

Granting permission to access the database from a particular Ip<\/div>\n

# grant all privileges on *.* to ‘root’@’192.168.1.67’ identified by ‘mysql1’;<\/p>\n

# flush privileges;<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

We can check how to install mysql db in a linux machine All files of mysql including DB are stored in \/var\/lib\/mysql\/ <\/p>\n

 <\/p>\n

All configuration files are in \/etc\/my.cnf <\/p>\n

 <\/p>\n

Install the package using yum # yum install mysql mysql-server <\/p>\n

 <\/p>\n

And then start the mysql server # service mysqld start <\/p>\n

 <\/p>\n

Here no root […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/2281"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2281"}],"version-history":[{"count":8,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/2281\/revisions"}],"predecessor-version":[{"id":2289,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/2281\/revisions\/2289"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2281"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2281"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2281"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}