Mysql doesn't want to run on archlinux. Why?

Question

MySQL

I just installed MYSQL (pacman installed MariaDB, although I don't think it matters), but MYSQL doesn't want to start.
The log is like this:

151209 01:38:41 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
2015-12-09 01:38:41 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2015-12-09 01:38:41 0 [Note] /usr/bin/mysqld (mysqld 5.6.27-75.0) starting as process 22045 ...
2015-12-09 01:38:41 22045 [Warning] Buffered warning: Changed limits: max_open_files: 1024 (requested 5000)

2015-12-09 01:38:41 22045 [Warning] Buffered warning: Changed limits: table_open_cache: 431 (requested 2000)

/usr/bin/mysqld: Table 'mysql.plugin' doesn't exist

What to do? The config was not touched:

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html

[client]
port            = 3306
socket          = /run/mysqld/mysqld.sock

[mysqld]
port            = 3306
socket          = /run/mysqld/mysqld.sock
datadir         = /var/lib/mysql

#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

[mysqld_safe]
log-error       = /var/log/mysqld.log
pid-file        = /run/mysqld/mysqld.pid

Answer 1

Was the startup script executed (it also sets the root password) before starting the service?

Answer 2

Try running mysql_upgrade -u root -p, although I don't know if it will start without running MySQL =)))
well, delete the files "rm -rf /var/lib/mysql/" and then "mysql_install_db --user=mysql --basedir= /usr"