Previously we look at on how to Clean up Comment Meta in WordPress Database. If you would like to optimize your database further you may want to Cleanup Unnecessary Plugin RSS Feed as well.
Remember to backup your database prior to removing these entries.
Once done with the database backup log in to phpMyAdmin, select the right database & click on “SQL” menu on the top.
DELETE FROM wp_options WHERE option_name LIKE '_transient_timeout_rss%';
DELETE FROM wp_options WHERE option_name LIKE '_transient_rss_%';
DELETE FROM wp_options WHERE option_name LIKE '_transient_timeout_feed_%';
DELETE FROM wp_options WHERE option_name LIKE '_transient_feed_%';