select
b.SEQUENCE#,
b.FIRST_TIME,
a.SEQUENCE#,
a.FIRST_TIME,
round(((a.FIRST_TIME-b.FIRST_TIME)*24)*60,2) minutes
from
v$log_history a, v$log_history b
where
a.SEQUENCE# = b.SEQUENCE#+1 and
b.THREAD#=1
order by
a.SEQUENCE# desc
/
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