Problem in connect to database?

hello experts,
when i am trying to connect with sqlplus with my user following error is showing:
ora 01034: oracle not available
ora 27101shared memory realm SGA does not exist.
suddendly this error is showing. i just connect successfully before 10 minuts.
please help me how to resolve it and what is the problem.
but when i can connect to sysdba i hgiven message:
connected to an ideal instance.
thanks
yash

sqlplus / as sysdba
startup ;Also how Many Instance you have ?
Do you have one more than once on same server ?
How many Memory (Ram) Server have ?

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Hi,
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Extracted from Re: Webdynpro and Oracle
http://help.sap.com/saphelp_webas630/helpdata/en/b0/6e62f30cbe9e44977c78dbdc7a6b27/frameset.htm
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user9290950 wrote:
Hi,
As I wrote in my previous post when I was installing database my PC was not connected to network.
And as was already replied.
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======================
import java.sql.*;
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=================
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