This is just a short reminder about what to keep in mind when you're preparing some MySQL 8.0 performance testing (or any other 8.0 evaluation) and want to do it "with less blood" ;-))

So far, here is the list :

  • 8.0 is using UTF8 by default, so if you're expecting to compare apples-to-apples, configure it with "latin1" as it was before to compare to 5.7/5.6/etc. (or configure them all to UTF8 if your target is to compare UTF8)..
  • binlog is enabled by default, so mind to switch it OFF if it's not in your target..
  • SSL is ON by default (switch it OFF if not your target)
  • auto UNDO truncate is ON by default (if you prefer to avoid any periodic spikes in background of flushing activity due UNDO auto truncate, just switch this features OFF (while you'll still be able to involve the same truncate manually whenever you need it))
  • there is a new default authentication plugin (and if you want to see your old apps still working with 8.0, just initialize your MySQL instance + use in your config file the old plugin instead (NOTE: you may still switch plugins via ALTER))
  • InnoDB doublewrite fix is still NOT part of the published code, so unless your target is to really show how this missed fix is impacting your workload, switch it OFF (but still mind to bombard Sunny with complaining messages about how this fix is important for you ;-))
And now all these points in action :

MySQL 8.0 Server initialization :
$ ./bin/mysqld --user=mysql --datadir=./data --initialize-insecure \
   --default-authentication-plugin=mysql_native_password
to add to your my.conf file before you start your MySQL instance :
[mysqld]
 ...
 ssl=0
 default_authentication_plugin=mysql_native_password
 skip_log_bin=1
 character_set_server=latin1
 collation_server=latin1_swedish_ci
 skip-character-set-client-handshake
 innodb_undo_log_truncate=off
 innodb_doublewrite=0

And once started, you'll see your MySQL 8.0 instance running "similar to before", allowing you to evaluate it with the same tools you were using until now. After what, please, take your time to learn what "all these differences" are meaning, why they were introduced, and how properly to use them..

Rgds,
-Dimitri