1. First We need to set the environment path for PATH,ORACLE_HOME and ORACLE_SID. we can get the path of sid from services.msc C:\Windows\system32>set PATH=f:\app\ankush\product\12.1.0\dbhome_4\bin C:\Windows\system32>set ORACLE_HOME=f:\app\ankush\product\12.1.0\dbhome_4\ C:\Windows\system32>set ORACLE_SID=GRP 2. Connect to sqlplus utility and fire the startup command. C:\Windows\system32>sqlplus / as sysdba

SQL*Plus: Release 12.1.0.2.0 Production on Tue Oct 30 00:20:10 2018 Copyright (c) 1982, 2014, Oracle. All rights reserved. Connected to an idle instance. SQL> startup ORACLE instance started. Total System Global Area 3841982464 bytes

Fixed Size 3052576 bytes Variable Size 872418272 bytes Database Buffers 2952790016 bytes Redo Buffers 13721600 bytes Database mounted. Database opened.

3. At last check the status of database. SQL> select name,open_mode from v$database; NAME OPEN_MODE ——— ——————– GRP READ WRITE