Sqlplus Login Protocol Adapter Error

Cause Ora-12560:tns: The problem with the protocol adapter error is three

1. The monitoring service is not up. Windows platform: Start---program---management tools---services, open the Services panel, start the Oraclehome92tnslistener service.

2.database instance did not rise up. The Windows platform: start---program---management tools---services, open the Services panel, start oracleservicexxxx,xxxx is your database SID.

3. Registry issues. Regedit and then go to HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\HOME0 set the environment variable ORACLE_SID to XXXX,XXXX is your database Sid. Or right My Computer, attribute--advanced--environment variable---system variable--new, variable name =oracle_sid, variable value =xxxx,xxxx is your database SID. Or enter sqlplus before the command Line down set ORACLE_SID=XXXX,XXXX is your database SID. After the above steps, you can solve the problem.

Sqlplus Login Protocol Adapter Error