MySQL DB

How to Backup MySQL Database?

To take a backup of MySQL database or databases, the database must exist in the database server and you must
have access to it. The format of the command would be.

# mysqldump -u [username] –p[password] [database_name] > [dump_file.sql]

The parameters of the said command as follows.

  1. [username] : A valid MySQL username.
  2. [password] : A valid MySQL password for the user.
  3. [database_name] : A valid Database name you want to take backup.
  4. [dump_file.sql] : The name of backup dump file you want to generate.

How to Backup a Single MySQL Database?

To take a backup of single database, use the command as follows. The command will dump database [rsyslog]
structure with data on to a single dump file called rsyslog.sql.

# mysqldump -u root -ptecmint rsyslog > rsyslog.sql

How to Backup Multiple MySQL Databases?

If you want to take backup of multiple databases, run the following command. The following example
command takes a backup of databases [rsyslog, syslog] structure and data in to a single file
called rsyslog_syslog.sql.

# mysqldump -u root -ptecmint --databases rsyslog syslog > rsyslog_syslog.sql

How to Backup All MySQL Databases?

If you want to take backup of all databases, then use the following command with option –all-database.
The following command takes the backup of all databases with their structure and data into a
file called all-databases.sql.

# mysqldump -u root -ptecmint --all-databases > all-databases.sql

How to Backup MySQL Database Structure Only?

If you only want the backup of database structure without data, then use the option –no-data
in the command. The below command exports database [rsyslog] Structure into
a file rsyslog_structure.sql.

# mysqldump -u root -ptecmint -–no-data rsyslog > rsyslog_structure.sql

How to Backup MySQL Database Data Only?

To backup database Data only without structure, then use the option –no-create-info
with the command. This command takes the database [rsyslog] Data  into a file rsyslog_data.sql.

# mysqldump -u root -ptecmint --no-create-db --no-create-info rsyslog > rsyslog_data.sql

How to Backup Single Table of Database?

With the below command you can take backup of single table or certain tables of
your database. For example, the following command only take backup of wp_posts
table from the database wordpress.

# mysqldump -u root -ptecmint wordpress wp_posts > wordpress_posts.sql

How to Backup Multiple Tables of Database?

If you want to take backup of multiple or certain tables from the database, then separate each table with space.

# mysqldump -u root -ptecmint wordpress wp_posts wp_comments > wordpress_posts_comments.sql

How to Backup Remote MySQL Database

The below command takes the backup of remote server [172.16.25.126] database [gallery] into a local server.

# mysqldump -h 172.16.25.126 -u root -ptecmint gallery > gallery.sql

How to Restore MySQL Database?

In the above tutorial we have seen the how to take the backup of databases, tables, structures and
data only, now we will see how to restore them using following format.

# # mysql -u [username] –p[password] [database_name] < [dump_file.sql]

How to Restore Single MySQL Database

To restore a database, you must create an empty database on the target machine and restore the database
using msyql command. For example the following command will restore the rsyslog.sql file
to the rsyslog database.

# mysql -u root -ptecmint rsyslog < rsyslog.sql

If you want to restore a database that already exist on targeted machine, then you will need to
use the mysqlimport command.

# mysqlimport -u root -ptecmint rsyslog < rsyslog.sql

In the same way you can also restore database tables, structures and data. If you liked this article, then do share it with your friends.

ที่มา: http://www.tecmint.com/mysql-backup-and-restore-commands-for-database-administration/

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