Basics things DBA must know

Starting Oracle Single Node Instance.

su - oracle                     -- this is for switch user puprpose (oracle-Database user)

lsnrctl start orcl             -- lsnrctl means listener control starting (orcl- SID of database)

then we have to enter in sql prompt

sqlplus '/as sysdba' --sys-username sys-password sysdba previlege

startup -- to start instance

exit -- to exit sqlprompt

exit --to exit database

then we have to start application

su -applmgr  (applmgr- application user)

cd $COMMON_TOP/admin/scripts/SID_HOSTNAME/

ls --to view files inside scripts

./adstrtal.sh apps/apps  --to start application

NFS MOUNT FROM SERVER A to B

root@A ] scp -r Filename  root@ipaddress B:/Location in B server 

root@A ] password for B: 

(this should be run as root user from server A)

Nfs Mounting steps:-
*Source system A :-*

commands are

1)vim /etc/exports         -- to view already nfs mounted
2)/vin *(rw,rcync)
3)chkconfig portmap on     --portmap on
4)service portmap restart  --portmap restart
5)chkconfig nfs on         --nfs on
6)service nfs restart      --nfs restart
7)showmount -e
8)exportfs

*Target System B :-*

9)mount ipaddress(A):/vin /mnt


Linux Hard Disk Format Command

1.Partition the new disk using fdisk command
# fdisk -l | grep '^Disk' 

output

Disk /dev/sda: 251.0 GB, 251000193024 bytes
Disk /dev/sdb: 251.0 GB, 251000193024 bytes.

Step 1:Format the new disk using mkfs.ext3 command

# mkfs.ext3 /dev/sdb1 

step 2:To partition the disk - /dev/sdb, enter: 

# fdisk /dev/sdb 

The display shows the basic fdisk commands you need are:

• m - print help
• p - print the partition table
• n - create a new partition
• d - delete a partition
• q - quit without saving changes
• w - write the new partition table and exit
  

step 3: type n and enter

step 4:then it will ask the partition number , we have to set 1 , that is default one in starting ,

step 5:then it ask the first partition size , after we give partition sizeand pressed enter it will again show the basic fdisk commands ,

step 6:if u want to create a second partition then you have to repeat the same steps by using partition number 2 and partition size is from partition 1 end size to partition 2 size

step 7:finally we have to type w and press enter then quit otherwise the partition will not save

Source http://www.cyberciti.biz/faq/linux-disk-format/