Database Not Open Error

Resolving :

C:\Users\abhishek>sqlplus sys/*****@localhost:1521/XEPDB2 as SYSDBA

SQL*Plus: Release 18.0.0.0.0 - Production on Tue Mar 19 16:39:29 2019
Version 18.4.0.0.0

Copyright (c) 1982, 2018, Oracle.  All rights reserved.


Connected to:
Oracle Database 18c Express Edition Release 18.0.0.0.0 - Production
Version 18.4.0.0.0

SQL> alter database open;

Database altered.