This is the most important and useful option you can use and change the optimization settings in 7-Zip on the command line:

-mx, 7-Zip compression switch:

• -mx0 – Don’t compress at all. ( Is called “copy mode.” )
• -mx1 – Very low compression. (It is called “fastest” mode. )
• -mx3 -  Fast compression mode.
• -mx5 -  Same as above, but “normal.”
• -mx7 – “maximum” compression.
• -mx9 -  “ultra” compression (slowest).
• -mmt – Enable multithreading. (if you have quad-core and a huge archive – Specify “on” or “off”.).

7-Zip example (store mode, not compression):

[root@server1]# 7za a -mx0 mysql.zip /var/lib/mysql/