I guess I messed up the user table trying to update the password running something like

UPDATE mysql.user SET authentication_string='root' WHERE User='root';

without flushing privileges. Now I'm basically locked out and I cannot connect to mysql cli even if I try

sudo mysqld_safe --skip-grant-tables &

There is a way I can safely remove all mysql databases including user table?

(MacOS mojave)

This is the content of /usr/local/bin related to mysql

mysql               mysqladmin          mysqlpump
mysql.server            mysqlbinlog         mysqlrouter
mysql_client_test       mysqlcheck          mysqlrouter_plugin_info
mysql_config            mysqld              mysqlshow
mysql_config_editor     mysqld_multi            mysqlslap
mysql_secure_installation   mysqld_safe         mysqltest
mysql_ssl_rsa_setup     mysqldump           mysqlxtest
mysql_tzinfo_to_sql     mysqldumpslow
mysql_upgrade           mysqlimport

First backup your /etc/mysql and /var/lib/mysql directories.

Then try to initalize


to recreate the mysql schema from scratch.

You can read about it here: https://dev.mysql.com/doc/refman/5.6/en/mysql-install-db.html

  • I do not have both those dirs. And I get command not found launching mysql_install_db. It is a fresh installation I don't have any db I have to save. I don't mind wiping up the whole mysql installation. But I'm not clear what to do other than uninstall using brew Apr 28 '19 at 17:44
  • what whereis mysql says?
    – Comar
    Apr 28 '19 at 17:45
  • which mysql prints /usr/local/bin/mysql (whereis prints nothing) Apr 28 '19 at 17:47
  • Ah, my mistake, I have confused OS. Look for mysql configuration, binaries and files somewhere inside /usr/local, you may try to use locate mysql for this job.
    – Comar
    Apr 28 '19 at 17:50
  • I edited the question with my mysql bins in /usr/local/bin if it helps Apr 28 '19 at 17:52

You could simply uninstall mysql and purge configuration files if you don't need the databases or any settings.

The steps would be:

brew uninstall mysql
brew cleanup
sudo rm -rf /usr/local/var/mysql    ## verify within my.cnf

ps. Take this with a grain of salt, as I'm not a MacOS user.

  • I would avoid mess up the whole sistem, I will search around a little bit. macOS it's a f nightmare... Apr 28 '19 at 17:59
  • ok even removing /usr/local/var/mysql didn't solved.. Apr 28 '19 at 18:05
  • You might need to remove the binaries too, try this also: sudo rm -rf /usr/local/bin/mysql.
    – Leo
    Apr 29 '19 at 14:53

I got the problem, basically almost all the solution you can find around are outdated. With mysql 8.0.15 you have to follow this guide https://dev.mysql.com/doc/refman/8.0/en/resetting-permissions.html

Using the method UPDATE mysql.user SET authentication_string.. will lock you out from your own mysql server (you won't solve even with mysqld_safe --skip-grant-tables).


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