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error ora-12560 TNS protocol error

Posted on 2011-03-17
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Last Modified: 2012-05-11
hi guys, i installed oracle 11gr2 on wondow 7, but am not able to login getting error error ora-12560 TNS protocol error
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Question by:nirvairghuman
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3 Comments
 
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by:choukssa
choukssa earned 62 total points
ID: 35156252

Some things to consider--

1. Do you have the proper client ?
2. Is listener running?
3. Is ORACLE_SID set properly?

--choukssa
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by:nirvairghuman
ID: 35158263
Yeah, i have set ORACLE_SID and my listener is running, but i installed on my local pc.
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LVL 5

Accepted Solution

by:
anand_20703 earned 63 total points
ID: 35189095
open command prompt
tnsping ORACLE_SID ( replace the correct oracle_sid name here)
result ? ( will give u clue what is the cause ?)
.
another check
set ORACLE_SID=name of oracle_sid
sqlplus /nolog
conn / as sysdba

result ? ( if successful, then the problem is with your listner and it's setup,availability....)
(if not successful, problem is with your database avialability, setup...)
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