[Floyd R Turbo]

My site is not that active. I have less than 100 users, and I do have people register successfully, just not that often, only a couple a month.

So it seems to me that someone is trying to 'ping' the database or something. Maybe someone can explain to me what actually causes the error. Because to me it does not make sense that I get this error message

Invalid SQL:
SHOW COLUMNS FROM user LIKE 'username';

MySQL Error   : Incorrect key file for table '/tmp/mysqltmp/#sql_1851_0.MYI'; try to repair it

for Usernames that are not registered!! Like these, all received in the last 24 hours

IP Address    : 118.101.4.158
Username      : HumbertoC

IP Address    : 91.207.8.157
Username      : tzhang216

IP Address    : 188.123.248.25
Username      : Flapidolilt

IP Address    : 108.61.95.217
Username      : ShanaZSS

IP Address    : 222.76.80.244
Username      : turejrn

IP Address    : 109.169.82.12
Username      : DanuncoqH

IP Address    : 75.136.23.77
Username      : DonaldRHW

IP Address    : 113.212.68.20
Username      : MartaMont

IP Address    : 5.9.251.139
Username      : Antoinett

So it's not like someone is trying to register and failing. They are trying to do SOMETHING that seems to set off this error. It seems like bot or spammer activity or something.