Microsoft Windows [Version 10.0.19041.985] (c) Microsoft Corporation. All rights reserved.
C:\windows\system32>sqlplus system/to@hbj
SQL*Plus: Release 12.2.0.1.0 Production on Wed May 26 11:26:26 2021
Copyright (c) 1982, 2016, Oracle. All rights reserved.
ERROR: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Enter user-name: system Enter password: ERROR: ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist Process ID: 0 Session ID: 0 Serial number: 0
