Problem while connecting to oracle in linux

i connected to oracle in linux as
"sqlplus ,#sysdba,"
after that it asked me for password
and i typed as "oracle"
after tat message displayed that "connected to IDEAL instance"
SQL>select * from tab;
i got an error message staying tat "ORACLE not connected"
can anyone help me out where the poblem is getting

hi,
after tat message displayed that "connected to IDEAL instance"
i got an error message staying tat "ORACLE not connected"you are connected to an ideal instance.
you should mount and then open the database
if you are using spfile
then issue
SQL>startup
database mounted.
database opened.
or
SQL> startup nomount pfile='location'
database will be in nomount stage
SQL>alter database mount;
database mounted.
SQL>alter database open;
then you can issue your command..
regards,
Deepak

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I wrote a JAVA program to test the connection with
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in Linux Environment. I got the error message: "IO
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Here is JAVA code:
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class Employee1
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must be something wrong in the Linux environment. I
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Tony
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