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#1 02-07-2020 04:05:18

From: UK
Registered: 05-29-2007
Posts: 828

K9 Server Memory Requirement

Munin is reporting a critical error with "MySQL InnoDB free table space" on all graphs maxed out at 8.0M and average 6.97M on the year graph.

Our dedicated server spec is

Platform:     Linux
Operating System: CentOS 7 64-bit     
Control Panel: cPanel Pro
CPU:     1x Intel Xeon E3-1230v5 @ 3.4GHz
Memory:     2x 8GB DDR4 U
Hard Drive:     2x 120GB SSD RAID1

Can you advise how we can rectify the error?

Would having a clearout of the DB help and if so how to do that?

I have asked our webhost to advise as well.

Last edited by sdn (02-07-2020 04:15:58)




#2 02-07-2020 04:32:27

From: UK
Registered: 05-29-2007
Posts: 828

Re: K9 Server Memory Requirement

Our webhost has replied as follows:

This is a known issue with Munin and the way it interacts with MySQL and InnoDB.

Munin throws a warning whenever there is >2GB of table space and a critical warning at >1GB tablespace remaining.

MySQL defaults to creating a 10MB auto-expanding tablespace ( this can be verified with # mysql -e "SHOW VARIABLES LIKE 'innodb_data_file_path'"

This means InnoDB will perpetually show <10MB of space (resulting in a permanent Munin warning) yet will always seamlessly autoextend as needed.

The way to resolve is for us to simply to disable the alerts through creation of this file:

# vi /etc/munin/plugin-conf.d/mysql_innodb

And placing the following inside

env.warning 0
env.critical 0




#3 02-07-2020 09:09:05

From: York, PA
Registered: 04-20-2001
Posts: 19512

Re: K9 Server Memory Requirement

Thanks for the follow-up.  To safely clear space in the database by removing old sessions and carts, execute these commands:


DELETE FROM ecom_cart

DELETE FROM core_sessions

FYI: Versions 9.0.2 are very highly optimized in regard to database storage requirements that I doubt you'll find any tables you think are too large.  On busy sites we were seeing the core_sessions table expand to over 1 million rows over time and maintaining that level due to the way V8 pruned old entries.  The same sites using K9 (9.0.2+) are seeing that same table at 150k rows with four times the traffic.  So make sure you're on 9.0.2+, which I believe you are.

Nick Hendler



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