How does one see the uptime for a database

Look at the following SQL query

SQL>SELECT to_char (startup_time, 'DD – MON – YYYY HH24: MI: SS') "DB Startup Time"
FROM sys.v_$instance;

or
SQL>SELECT to_char (logon_time, 'Dy dd Mon HH24: MI: SS') "DB Startup Time"
FROM sys.v_$session
WHERE Sid=1; /* this is pmon */

How to fix: ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: YES)

Open your terminal and type mysql -u root -p Enter your password. Hopefully your MySQL is logged in now.