This query is useful for knowing how long your database has been up and when it was started. It has been tested...
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on versions 8 and up.
select to_char(startup_time,'DD-MON-YYYY HH24:MI:SS') from V$instance;
select to_char(startup_time,'DD-MON-YYYY HH24:MI:SS') from V$instance where instance_name='&name';
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