How to turn off and restart Linux ?
Shutting down, rebooting the computer from the shell or command line
Below is a list the commands that will enable a user to shut down, turn off, reboot, etc. their Linux computer from the command line.
- halt
- poweroff
- reboot
- shutdown
Commands with options:
/sbin/halt [-n] [-w] [-d] [-f] [-i] [-p] [-h]
/sbin/reboot [-n] [-w] [-d] [-f] [-i]
/sbin/poweroff [-n] [-w] [-d] [-f] [-i] [-h]
/sbin/reboot [-n] [-w] [-d] [-f] [-i]
/sbin/poweroff [-n] [-w] [-d] [-f] [-i] [-h]
OPTIONS
- -n
- Don't sync before reboot or halt.
- -w
- Don't actually reboot or halt but only write the wtmp record (in the /var/log/wtmp file).
- -d
- Don't write the wtmp record. The -n flag implies -d.
- -f
- Force halt or reboot, don't call shutdown
- -i
- Shut down all network interfaces just before halt or reboot.
- -h
- Put all harddrives on the system in standby mode just before halt or poweroff.
- -p
- When halting the system, do a poweroff. This is the default when halt is called as poweroff.
- Simply, Reboot command restart the Linux servers.
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How to stop oracle database ?
Stopping/Shutdown the Oracle Database
There are certain ways to start oracle database like:- Using SQLPLUS
- Using Oracle Enterprise manager (If DB is configured with EM)
- Using Oracle Grid/cloud control (If DB is configured with GC)
1. Logon to the database server as the administrator/OS user 2. To start the database instance, go to Start -> Settings -> Control Panel -> Administrative Tools -> Services.
3. Scroll down to the service for the database, for example: OracleServiceORCL
4. Right click and select Stop. A dialog box appears showing the progress of the shut-donw and after a few seconds it will disappear.
The database instance service is now stopped
Linux Database Shutdown
1. Logon to the database server as the administrator/OS user
2. To start the database instance, go to Terminal and set below environment variable if already not.
On Bash shell,
export ORACLE_HOME=<ORACLE_HOME value like /u01/app/oracle/product/11.2/db_1>
export PATH=$ORACLE_HOME/bin:$PATH
export ORACLE_SID=<DB Name like orcl>
3. Connect to the database:
sqlplus / as sysdba OR Sqlplus sys/<pwd>@<TNS> as sysdba
4.enter the following command:
shutdown;
OR
Shutdown immediate;
OR
Shutdown abort; (for instant DB shutdown)
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Different modes to shutdown Oracle Database
DATABASE SHUTDOWN IN DIFFERENT MODES
When shutting down an instance,
perform these steps, which are reverse from those you just saw when opening a
database:
- Close the database, including the data files and redo logs, so that it is no longer usable for normal tasks.
- Unmount the database from the instance so that only the instance memory structures and background tasks are left running without a database associated with them.
- Shut down the instance to close the control files.
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