ORA-01075: you are currently logged on

ORA-01075: you are currently logged on while connecting to Oracle Database

$ sqlplus "/as sysdba"
SQL*Plus: Release 12.1.0.2.0 Production on Thu Jan 3 13:03:23 2019
Copyright (c) 1982, 2014, Oracle. All rights reserved.
ERROR:
ORA-01075: you are currently logged on

Solution1:

Sometimes the issue can be resolved by just restarting the database.

Find the process id at OS level

$ps -ef|grep pmon

$kill -9 <PMON Process ID> <== if you have more than 1 database on the server choose the correct pmon process id, else you will make an outage for other database which you will never want

$ sqlplus "/as sysdba"

SQL> startup;

Solution2:

if solution 1 does not work.

Find the process id at OS level

$ps -ef|grep pmon

$kill -9 <PMON Process ID> <== if you have more than 1 database on the server choose the correct pmon process id, else you will make an outage for other database which you will never want

$ sqlplus "/as sysdba"

Connected to an idle instance.

SQL> create spfile from pfile;

File created.

Increase the value of sga_target

Create the spfile from pfile with increased sga_target

SQL> create spfile from pfile;

File created.

SQL> startup

ORACLE instance started.

Total System Global Area 1.0737E+10 bytes

Fixed Size 3722144 bytes

Variable Size 3581125728 bytes

Database Buffers 7113539584 bytes

Redo Buffers 39030784 bytes

Database mounted.

Database opened.

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