We got this message on our website:
Warning : mysqli_query(): (HY000/1021): Disk full (/tmp/#sql-temptable-38c-1378a-817.MAI); waiting for someone to free some space… (errno: 28 “No space left on device”) in /var/www/html/wp-includes/class-wpdb.php on line 2187
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As I can see that you’re running a WordPress site, I’ll recommend you make sure that you’re not running local backups with plugins like backupress or backupbuddy as this will “eat” the disk space out.
Also if you’re using a cache plugin the generated cache may consume a big chunk of the available disk space.
You can check this question that was previously asked in our community. Bobby’s answer is top notch