Editing Troubleshooting of MySQL errors (section)

=== MySQL server has gone away ===
Error conditions:
* Enable the option {{kbd | key = log_error}} in MySQL config file e.g. {{kbd | key = <nowiki>log_error="file_name_of_error_log"</nowiki>}}<ref>[https://dev.mysql.com/doc/refman/8.0/en/error-log.html MySQL :: MySQL 8.0 Reference Manual :: 5.4.2 The Error Log]</ref>.
* Example error log located at {{kbd | key = <nowiki>file_name_of_error_log</nowiki>}} are as following:

<pre>
2019-05-23T08:52:19.989876Z 99980 [Note] Aborted connection 99980 to db: 'DB_NAME' user: 'DB_USER' host: 'localhost' (Got a packet bigger than 'max_allowed_packet' bytes)
</pre>

Solution:

* Increase the value of {{kbd | key = <nowiki>max_allowed_packet</nowiki>}}<ref>[https://stackoverflow.com/questions/5688403/how-to-check-and-set-max-allowed-packet-mysql-variable php - how to check and set max_allowed_packet mysql variable - Stack Overflow]</ref> if the MySQL user has the {{kbd | key = <nowiki>SUPER</nowiki>}} privilege<ref>[https://dev.mysql.com/doc/refman/8.0/en/privileges-provided.html MySQL :: MySQL 8.0 Reference Manual :: 6.2.2 Privileges Provided by MySQL]</ref>.