Oracle Host String.

I Installed oracle on my machine after my installation I forgot my 'host name' . I am able to login without host name . But I need this host name for cognos installtion.I gone through the net and and I alter my Host string to 'orcl' but I am Unable login.
It's shows TNS Listner Error.
And I have one more question also
what is the diff b/w SID and Host string.
Thanks,
Mohana Krishana K
Edited by: user12275872 on Mar 1, 2010 9:52 PM

Hi,
Host is the address of the server.
Please check your tnsnames.ora file in your oracle_home->network->admin folder.
there you will find something as
HOST =Twinkle

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Mulyadi Kurniawan ([email protected]):
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Mulyadi Kurniawan ([email protected]):
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