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ORA-12560: TNS:protocol adapter error

KarkiApr 16 2019 — edited Apr 18 2019

I created a new database test123 with sample schema option in oracle 11g R2. But I am unable to connect

E:\>sqlplus sys/password

SQL*Plus: Release 11.2.0.1.0 Production on Tue Apr 16 14:32:59 2019

ERROR:

ORA-12560: TNS:protocol adapter error

I do not have tnsnames.ora as it's my local.

E:\>set oracle_sid = TEST123

E:\>sqlplus scott/tiger

SQL*Plus: Release 11.2.0.1.0 Production on Tue Apr 16 14:44:06 2019

ERROR:

ORA-12560: TNS:protocol adapter error

Enter user-name:

Added on Apr 16 2019

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