Site performance, Server errors, outages and tunings

[Like Ra]

I'm using MS Edge

You found the bug! 😉 😋

[Like Ra]

Heard of the global PHP bugs/hacks? The PHP is updated!

The past few days I had periods that I could not connect with the site at all. The last one was yesterday I believe, after you must have addressed the PHP update.
I did get a lengthy error message though, which did indeed mention that it was a PHP error and some buffer was full. Alas I wasn't smart enough to keep a copy of the error. Maybe more people had this problem?
I do connect via eduvpn@surf.nl which is quite handy as I am currently not in the Netherlands.

[Like Ra]

The last one was yesterday I believe

I restarted PHP several hours ago. Possibly, you got this error message exactly at that time.

Did you restart it again. I could not get to the site a little over an hour ago. This time I have the full error message just in case it is not due to a restart:

Fatal error: Uncaught mysqli_sql_exception: The table 'mybb_sessions' is
full in /home/likera/public_html/forum/mybb/inc/db_mysqli.php:335 Stack
trace: #0 /home/likera/public_html/forum/mybb/inc/db_mysqli.php(335):
mysqli_query() #1
/home/likera/public_html/forum/mybb/inc/db_mysqli.php(378):
DB_MySQLi->query() #2
/home/likera/public_html/forum/mybb/inc/db_mysqli.php(1337):
DB_MySQLi->write_query() #3
/home/likera/public_html/forum/mybb/inc/class_session.php(571):
DB_MySQLi->replace_query() #4
/home/likera/public_html/forum/mybb/inc/class_session.php(419):
session->create_session() #5
/home/likera/public_html/forum/mybb/inc/class_session.php(116):
session->load_guest() #6
/home/likera/public_html/forum/mybb/global.php(49): session->init() #7
/home/likera/public_html/forum/mybb/index.php(18): require_once('...') #8
{main} thrown in /home/likera/public_html/forum/mybb/inc/db_mysqli.php on
line 335

[Like Ra]

The table 'mybb_sessions' is full

Aha! That's different!!! Apparently, the AI bots overloaded the site. MySQL mybb_session table is kept in memory (not on disk). I wonder what the limitations are. Will check ASAP. Thanks much!

[Like Ra]

MySQL mybb_session table is kept in memory

It has 95,576 entries, and it's 128MB in size.
The daily cleanup task did not decrease it. Hm...