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monitoring mysql performance


 I have a VPS Web server (Apache 2.4/PHP 7.x + Varnish 4.1) running with
MySQL 5.6. I have 20 Gb of RAM. I serve Wordpress sites mainly all using

 So I´m thinking of ways of improving MySQL performance and of course
for that, you need to measure.

 Currently I´m checking, there are no slow queries and read and writes
perform well. I have enabled slow queries logging but the truth is that
most queries logged are not slow, they are just slow when the web server
load is too high, so when you try to check those queries at other time,
there isn´t anything wrong with them.

 So I migrated from MySQL 5.5 to 5.6 and enabled query cache. I´ve heard
you can use memcached for caching reads and writes but not sure about this.

 So I started to look into graphical open source tools to measure my
server (mostly  MySQL) performance before doing any change.

 Sincerely, I´m overwhelmed on the possibilities, kibana, grafana, etc
and I don´t know which one to choose.

 For starters I was thinking of setting up a virtual machine on my
laptop and configure one of those and get the data from the server (not
sure if this is feasible without loosing information when the VM is not

 What do you guys recommend me?



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