how will you check whether database active or not from OS level?

Answer Posted / s thotla

from Ora<sid> give the following the commands
ps -ef |grep ora_
ps -ef |grep pmon
If all the Oracle background process are running we can say
that oracle is up and running.
OR
connect to the sql like sqlplus "/as sysdba"
sql> select status from v$instance;
if the output is "open" we can say that Oracle up and
running fine.

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