Oracle 21c, OS: Windows 10
SYS@orcl>
SYS@orcl> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
ERROR:
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Warning: You are no longer connected to ORACLE.
SYS@orcl> exit
and when trying to login again :
D:\Oracle21c\HR_Schema>sqlplus sys/oracle@orcl as sysdba
SQL*Plus: Release 21.0.0.0.0 - Production on Fri Apr 4 17:25:31 2025
Version 21.3.0.0.0
Copyright (c) 1982, 2021, Oracle. All rights reserved.
ERROR:
ORA-12514: TNS:listener does not currently know of service requested in connect
descriptor
Enter user-name:
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
please help to resolve this.