SERVER REBOOT

If its Dataguard setup or normal db, following steps mandatory just take backup of following three steps and store it in separate notepad. once server reboot activity completed cross check once which was taken before server reboot.
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ps -ef|grep pmon 

ps -ef|grep pmon|wc -l

ps -ef|grep inh (OR) ps -ef|grep tns

ps -ef|grep inh|wc -l

ps -ef |grep d.bin

hostname

date

uname -a

cat /etc/oratab  /  cat /var/opt/oracle/oratab

uptime

who -b

df -h  / df -gt
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server reboot time database side need to  check the below commands:
(Before server reboot and after server boot, if its is DG database)
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SQL> select name,db_unique_name,database_role,controlfile_type,CREATED from v$database;

SQL >select sequence#,first_time,next_time,completion_time,applied from v$archived_log where applied <> 'YES' and DEST_ID !=0 and status!='D'and completion_time <(sysdate-1/48) Order By 1;

no rows selected----->in sync

SQL >select process, status ,sequence# from v$managed_standby;

MRP0---->process should reflect

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Data Guard Db Startup Procedure
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Sqlplus “/ as sysdba”

startup nomount;

alter database mount standby database;

recover managed standby database disconnect from session; ----------->To put it in MRM MODE

exit;

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Data Guard Db  Shutdown Procedure
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Login as oracle

source the environment

sqlplus “/ as sysdba”

alter database recover managed standby database cancel; ------> to cancel MRM mode

shutdown immediate;

exit