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Find out when the database was started

This query tells you when your Oracle database was started.

This query is useful for knowing how long your database has been up and when it was started. It has been tested on versions 8 and up.

select to_char(startup_time,'DD-MON-YYYY HH24:MI:SS') from V$instance;
If you are running more than one instance -- i.e., you're using the parallel server option -- then:
select to_char(startup_time,'DD-MON-YYYY HH24:MI:SS') from V$instance
 where instance_name='&name'; 

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