Hi Kumar,
1. Check the below environment variables, as they all should be set:-
ORACLE_SID
System ID of the database instance
Example: C11
SAPSID or sapsid refers to the SAP System ID.
DBSID or dbsid refers to the name of the database instance (database instance system ID).
When a single instance is installed, SAPSID and DBSID are the same.
- ORACLE_HOME
Home directory of the Oracle software. This variable no longer needs to be set. If not set, the SAP tools determine its value from the registry.
Standard: <drive>:\orant
Example: D:\orant
This variable is optional with Oracle version 8.1 and later.
- SAPDATA_HOME
Directory of the database files.
Standard: <drive>:\oracle\<DBSID>
Example: E:\oracle\C11
2. Check whether Oracle services are running in services.msc
3. Check whether listener is up or not by
go to Run
lsnrctl
lsnrctl> status
If not start it.
Regards,
Himanshu