To cleanup some space on your disk with old incidents in the Oracle\diag folder do the following

• Open Command Prompt as administrator
• Check that the ORACLE_HOME variable is defined and that the PATH variable contains %ORACLE_HOME%\perl\bin

echo %ORACLE_HOME%
C:\oracle\product\19.3.0\dbhome_1

c:\source\35962832>echo %PATH%
C:\oracle\product\19.3.0\dbhome_1\bin;C:\Install_Oracle19c\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\oracle\product\19.3.0\dbhome_1\perl\bin

• If not present, type the following:

set ORACLE_HOME=C:\oracle\product\19.3.0\dbhome_1

set PATH=%ORACLE_HOME%\perl\bin;%PATH%

• Once oracle home is set, you can start ADRCI

C:\Windows\system32>adrci

ADRCI: Release 19.0.0.0.0 - Production on Tue Jul 23 11:43:03 2024

Copyright (c) 1982, 2024, Oracle and/or its affiliates.  All rights reserved.

ADR base = "C:\oracle"

• Check if home path is properly set

adrci> show home
ADR Homes:
diag\clients\xxx\host_2998225502_110
diag\rdbms\xxx\xxx
diag\tnslsnr\servername\xxx

• If you have multiple home path set, you'll have to specify the one that you want to cleanup. Look in the folder where are the diag files that need to be removed. It should be in the rdbms or the tnslsnr

adrci> set homepath diag\rdbms\xxx\xxx

• Once the home path is set, you can use the purge command to cleanup the diag files where -age is specified in minutes and - type is the type of diag files that needs to be cleaned up (incident, alert, trace … )

adrci> purge -age 20160 -type incident