phpMyAdmin is a program used to manipulate databases remotely through a web interface. A good hosting package will have this included. For information on backing up your WordPress database, see Backing Up Your Database.
Information here has been tested using phpMyAdmin 4.0.5 running on Unix.
The following instructions will replace your current database with the backup, reverting your database to the state it was in when you backed up.
Using phpMyAdmin, follow the steps below to restore a MySQL database.
Now grab a coffee. This bit takes a while. Eventually you will see a success screen.
If you get an error message, your best bet is to post to the WordPress support forums to get help.
The restore process consists of unarchiving your archived database dump, and importing it into your MySQL database.
Assuming your backup is a .bz2 file, created using instructions similar to those given for Backing up your database using MySQL commands, the following steps will guide you through restoring your database:
1. Unzip your .bz2 file:
user@linux:~/files/blog> bzip2 -d blog.bak.sql.bz2
Note: If your database backup was a .tar.gz file called blog.bak.sql.tar.gz, then
tar -zxvf blog.bak.sql.tar.gz
is the command that should be used instead of the above.
2. Put the backed-up SQL back into MySQL:
user@linux:~/files/blog> mysql -h mysqlhostserver -u mysqlusername -p databasename < blog.bak.sql Enter password: (enter your mysql password) user@linux~/files/blog:>