On 4/3/2017 8:15 AM, Mahmood N wrote:
When I click on the submit button in Moodle and it is waiting for refresh, I
execute the mysql command but the output is not meaningful
mahmood@ce:/var/www/html/courses$ mysql -u moodle -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 30912
Server version: 5.5.54-0ubuntu0.14.04.1 (Ubuntu)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show full processlist
->
->
Meanwhile using Webmin, I execute the same command for that user and see
Output from SQL command show full processlist ..
| Id | User | Host | db | Command | Time | State | Info |
| 30912 | moodle | localhost |
| Sleep | 42 |
I am not expert with MySQL, however as the Moodle admin I am trying to fix the
problems.
Regards,
Mahmood
You need to consider a few possibilities,
a) Moodle didn't want to wait long enough for the query to complete (a
Moodle Timeout) so it said "the server is not responding..."
b) Moodle sent MySQL a command that was "too large". To protect itself
from abuse, all MySQL instances have a configurable limit about how
"large" a command can be. If the command is larger than this limit, the
server rejects it and closes the connection. (this could explain why
the query you just attempted from Moodle is not visible in the list of
executing commands)
c) Something is unstable in your MySQL instance. The MySQL Error Log may
contain details explaining why mysqld was unable to stay running. The
angel process mysqld_safe would try to restart the server automatically
which could explain why Moodle was only unresponsive for a short while.
Additional resources:
https://dev.mysql.com/doc/refman/5.6/en/problems.html (in particular,
review B.5.2)
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