How to backup/export a single table from a MySQL database
The other day I was testing a feature on my development box when I realized that my local data was indeed out of date and I needed some fresh data from production if I wanted to make any progress with my testing. The problem is that our main MySQL database is very large and restoring a 10GB MySQL database would take hours even on the fastest machines.
Of course, everyone can point fingers and laugh at us for not using a better database like PostgreSQL , but since our site is based on WordPress, we have to use MySQL and make the most of it.
Luckily I remembered that command line arguments existed and looked to see if there was a way to use mysqldumpexport only one table, and sure enough there was. The syntax is this:
mysqldump [OPTIONS] database [tables]
Of course, this example is terrible, so here’s a better one – if you only wanted wordpressdbto back up the wp_users table from a WordPress database called , you could do something closer to this, which would export it all into a file called users.bak .
mysqldump -uUser -pPassword -hHostname wordpressdb wp_users > users.bak
Of course, we want to wp-configreplace the user, password, and hostname with the values in .
If we wanted to export more than one table—for example, if we realized we wp_usersmight need to export more than one table wp_usermeta—we could simply add this to the command:
mysqldump -uUser -pPassword -hHostname wordpressdb wp_users wp_usermeta > users.bak
To import this backup later, transfer it to wherever you want to use it and run the following command:
mysql -uUser -pPassword -hHostname databasename < users.bak
That's how to export a table and my local database is now up to date.
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