How to install Oracle DB Client

Installing Oracle database Client to access DB

Either you can use sqldeveloper as oracle client or you can execute it from the command line using # sqlplus

 We can access oracle server graphically by using a package called sqldeveloper. 

sqldeveloper-2.1.1.64.45-1.noarch.rpm

# rpm -ivh sqldeveloper-2.1.1.64.45-1.noarch.rpm 

if the front end not getting install the jdk package and try...

# or install jdk on root and put the package in user account and run the ./sqldeveloper.sh from user account. if it shows any permission problem give 777 permission for .sh file and install and tell the jdk installed path while asking. Also included path in /etc/profile and if needed add it in .bashrc file

From the console we can use a Client called sqlplus

$ sqlplus /nolog  ----- It starts sqlplus without logging in to a database.

$ connect / as sysdba   ------ Connecting as an administrative user,No password is required. This is equivalent to the desupported "connect internal" method.

$ sqlplus -s /nolog ----------- Sets silent mode which suppresses the display of the SQL*Plus banner, prompts, and echoing of commands. 

 $ SQLPLUS [ { username[/passward][@connect_identifier] | / } [ AS { SYSDBA | SYSOPER } ] | /NOLOG ]

  /home/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/tnsnames.ora ( In this path we are defining the connect_identifier, Using connect

using identifier we can access the db and tables of another system. To do so define the hostname,port,connect_identifier etc in tnsnames.ora file(copy the contents and edit the files)

$ sqlplus system/oracle@pfdb (connect_identifier)

we can connect to remote machine using this OR We can give the remote machine details in

tnsnames.ora, else connect using ipaddress and port/ We can give any connect_identifier name.

$ sqlplus system/oracle@orcl ------ Give the connection details in tnsnames.ora