I just upgraded our MySQL server from 5.5.53 by doing the following:

sudo apt-get purge mysql-server-5.5 mysql-client-5.5
sudo apt-get install mysql-server-5.6

Which got me to version 5.6.33

However, I'm looking to get to at least 5.6.4 where it appears the DATETIME datatype takes up 37.5% less space (per this article).

I can't seem to figure out / find how to upgrade from 5.6.33 to 5.6.4. Can anyone help?

FYI - I'm running Ubuntu 14.04. Let me know if you need any other relevant data.

Thanks in advance.

  • Did you run mysql_upgrade? Commented Oct 29, 2017 at 15:06
  • @ypercubeᵀᴹ Thanks, I got this response: This installation of MySQL is already upgraded to 5.6.33, use --force if you still need to run mysql_upgrade. Not sure how to decipher that, I'm pretty new to all of this.
    – elPastor
    Commented Oct 29, 2017 at 18:24
  • The internal format of DATETIME and TIMESTAMP changed. During the upgrade process, mysql_upgrade will (optionally?) rebuild the tables. DATETIME changed from 8 bytes to 5; TIMESTAMP changed from 4 to 5.
    – Rick James
    Commented Oct 31, 2017 at 12:32

1 Answer 1


I think you are wrong.

MySQL 5.6.33 is bigger than 5.6.4

For more information look at MySQL 5.6 release note:


MySQL 5.6.4 released at 2011-12-20 So MySQL 5.6.33 has already DateTime feature.

  • That would be incredibly confusing. That said, when comparing my table sizes, they are identical. I would have expected a decrease in size.
    – elPastor
    Commented Oct 29, 2017 at 14:27
  • I think you should Alter tables that have datetime column for use new datetime format. look at this topic mysqlserverteam.com/…
    – HamoonDBA
    Commented Oct 29, 2017 at 14:37
  • Ok, I'll have to dig into that before accepting this answer, but I appreciate the information.
    – elPastor
    Commented Oct 29, 2017 at 14:53

Not the answer you're looking for? Browse other questions tagged or ask your own question.