You are able to disable all WordPress plugins from your database. This is useful when you have problems with your WordPress and not being able to log in to the admin area or having blank pages.

To disable all plugins via database, you may follow below steps.

1. Log in to phpMyAdmin
2. Select your WordPress database from the menu on the left.
3. Browse the table with name 'wp_options' and find the option 'active_plugins'.
4. Edit the table by click the pencil icon to edit the table. The content will vary, depending on plugins you have enabled.
5. To disable all plugins, simply delete the code and click the Go button to save the changes.

The other option is to use the following query to disable all of your WordPress plugins:

UPDATE wp_options SET option_value = '' WHERE option_name = 'active_plugins';