mysql Reload option!

Posted on 2014-12-12
Last Modified: 2015-02-05
can someone please explain how does "mysql reload" works comparing to "mysql restart".
I made some changes on my.conf file, and I can't afford to restart mysql server. since "reload" is one of the mysql options (mysql start|restart|stop|force-reload|relaod), I tried it, but it doesn't apply the changes that I made to my.conf.

Question by:CCVOIP
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LVL 58

Expert Comment

ID: 40497439
reload reloads the conf files (configuration files) without stopping the server/program which should be pretty much instantaneous

restart stops the server/program and then starts it again which takes time

Author Comment

ID: 40497452
thanks for your reply.
if reload reloads the conf files, why it is not working for me. I uncommented two parameter within my.cnf:
   server-id = 1
   log_bin =  /var/log/mysql/mysql-bin.log
and saved the changes, then executed  /etc/init.d/mysql reload
but "show master status" still returns empty set
LVL 58

Expert Comment

ID: 40497464
Not everything can be reloaded and log_bin would be one of them - that requires a restart - why would you want to change this while running?

I'll see if I can find a comprehensive list
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Author Comment

ID: 40497477
so the "reload" applies only for a dynamic variables!!
I was asked to set up a replication, and see if there is any way to do it without restarting the mysql server. I wonder if you have any suggestion to achieve that

LVL 58

Expert Comment

ID: 40497481
Yes, cannot find a list of what you can change but yes dynamic variables that do not adversely affect the MySQL server.
So things like changing paths for example are not gonna work.
LVL 58

Accepted Solution

Gary earned 500 total points
ID: 40497483
I don't see how because of the reasons above, is a few seconds that important?
It's not something I would be overly familiar with but the closest example I found is this which still requires restarting

Author Comment

ID: 40497495
thanks for the link. I am  going to work on it when there is no heavy access to the production server.

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