[gentoo-user] Should mysql crash sometimes?

[Grant]

mysql-5.1.51 crashed recently and needed to be restarted.  This
doesn't happen often with mysql but does from time to time.  Is this
part of life with mysql or can it be prevented?  I don't think I've
changed the mysql config from default besides creating the necessary
tables although I could be wrong.  /var/log/mysql/mysqld.err doesn't
contain info about the crash but here's info from the restart:

[Warning] No argument was provided to --log-bin, and --log-bin-index
was not used; so replication may break when this MySQL server acts as
a master and has his hostname changed!! Please use
'--log-bin=mysqld-bin' to avoid this problem. /usr/sbin/mysqld: Table
'mysql.plugin' doesn't exist
[ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to
create it.
InnoDB: Started; log sequence number 0 43655
[Note] Recovering after a crash using mysqld-bin
[Note] Starting crash recovery...
[Note] Crash recovery finished.
[ERROR] Can't open and lock privilege tables: Table 'mysql.servers'
doesn't exist
[ERROR] Column count of mysql.db is wrong. Expected 22, found 20.
Created with MySQL 50070, now running 50151. Please use mysql_upgrade
to fix this error.
[ERROR] mysql.user has no `Event_priv` column at position 29
[ERROR] Cannot open mysql.event
[ERROR] Event Scheduler: An error occurred when initializing system
tables. Disabling the Event Scheduler.
[Note] /usr/sbin/mysqld: ready for connections.

It looks like I should run mysql_upgrade for one thing.  Is there a
Gentoo way to do that?  Will I lose data?

As I went over this I realized that I hadn't enabled skip-networking,
although nmap from the same system didn't show port 3306 open and I'm
not running a firewall on the machine.  How could that be?

- Grant