Oracle 10g installation

[Padma Priya]

hi Everyone,

I have installed Oracle 10g on my System....But when i run my Sql plus it askes me for UserName,PassWord And HostString....i have tried giving them but i end up getting an TNSError....I am at loss as what to give...As i am relatively new to Oracle i really don't know where the problem lies

My tnsnames.ora file is as shown below

# tnsnames.ora Network Configuration File: C:\oracle\product\10.1.0\db_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)

Can anybody help me out with this problem

Thanks in Advance
K.Deepthi

[Lukas Koniecki]

It seems that you haven't created appropriate listener (tip: use netca). Also check if you had specified ORACLE_HOME, ORACLE_BASE and ORACLE_SID system variables (tip: echo %ORACLE_HOME% etc.)