n some cases, you can see that your wp_options table is growing too fast and is becoming huge because of WooCommerce. If so, you can see that the sql table is full of _wc_session_xxx and _wc_session_expires_xxx entries. These can happen because of two things:

  • Cron tasks aren’t working on your site
  • A bot is crawling your site and creates sessions on the fly

But sometimes, the database is so big, that the process fails because of the PHP max execution time, or because of a lack of memory. In that case you can use the following MySQL query directly in phpMyAdmin:

DELETE FROM wp_options
WHERE option_name LIKE '_wc_session_%' OR option_name LIKE '_wc_session_expires_%'

And finally, to avoid the wp_options to become so big, make sure that cron aren’t disabled on your site, to do so check if your install does NOT contain this line of code:

define('DISABLE_WP_CRON', 'true');

If so, remove it.

One last thing, if you want, you can add the following code to the robots.txt file to avoid bots to create sessions while crawling your site:

User-agent: *
Disallow: /*add-to-cart=*


SOURCE