How to disable user sessions for frontend in Joomla?

Question

PHP

Given: many (100+) sites on Joomla 3.2+. Spam bots come to many sites, although in principle they have nothing to do there, almost all sites are business card sites, while bots are persistently looking for K2 components, mosets tree, jcomments, etc. to leave your spam comments.
Everything would be fine, but the problem is that for each bot, even on a cached page, requests are made to create a session, delete old sessions, and update the session. With high activity of bots (100+ hits per minute for each site) purely on these queries (INSERT, DELETE, UPDATE to the #__sessions table), the database becomes loaded.
The setting in the site configuration where you can specify Session storage does not really work (even if you specify None, the site will continue to communicate with the #__sessions table).
Is there any way to generally disable user sessions in the front?

Answer 1

configuration.php in the root of the site -
$lifetime : session duration in minutes. Specifies the time that will elapse before a user who is inactive is disconnected.
$session_handler : "database" or "none". Specifies how the session will be handled after the user connects.
specify session_handler: none

Answer 2

"session_handler = none" only means that the default handler will be used, that is, the file handler.
Salvation without Joomla Platform hacks I see only the use of session_handler APC or Memcached