ORACLE_MAINTAINED database users, part 2

Some time ago I wrote on ORACLE_MAINTAINED database users in Oracle 12c. Next question is: how are these users connected to database features and can the users be dropped – and if yes, how?

After installing a database with all options, you’ll get a long list of ORACLE_MAINTAINED users:

SQL> select username from dba_users where oracle_maintained='Y' order by 1;

USERNAME
------------------------------
ANONYMOUS
APEX_040200
APEX_PUBLIC_USER
APPQOSSYS
AUDSYS
CTXSYS
DBSNMP
DIP
DVF
DVSYS
FLOWS_FILES
GSMADMIN_INTERNAL
GSMCATUSER
GSMUSER
LBACSYS
MDDATA
MDSYS
OJVMSYS
OLAPSYS
ORACLE_OCM
ORDDATA
ORDPLUGINS
ORDSYS
OUTLN
SI_INFORMTN_SCHEMA
SPATIAL_CSW_ADMIN_USR
SPATIAL_WFS_ADMIN_USR
SYS
SYSBACKUP
SYSDG
SYSKM
SYSTEM
WMSYS
XDB
XS$NULL

35 rows selected.

The view DBA_REGISTRY provides some information how these users are connected to each other and to which feature they belong:

column comp_name format a35
column schema format a20
column other_schemas format a30
column username format a30

set linesize 120
set pagesize 50


SQL> select comp_name, schema, other_schemas from dba_registry;
COMP_NAME                           SCHEMA       OTHER_SCHEMAS 
 
Oracle Application Express          APEX_040200  FLOWS_FILES 
Oracle Label Security               LBACSYS 
Oracle Database Vault               DVSYS        DVF 
Oracle Multimedia                   ORDSYS       MDSYS,ORDDATA,ORDPLUGINS,SI_INFORMTN_SCHEMA 
Oracle Text                         CTXSYS 
Oracle Workspace Manager            WMSYS 
Spatial                             MDSYS        MDDATA,MDSYS,SPATIAL_CSW_ADMIN_USR,SPATIAL_WFS_ADMIN_USR 
Oracle XML Database                 XDB          ANONYMOUS,XS$NULL 
Oracle Database Catalog Views       SYS 
Oracle Database Packages and Types  SYS          APPQOSSYS,DBSNMP,DIP,GSMADMIN_INTERNAL,ORACLE_OCM,OUTLN,SYSTEM 
JServer JAVA Virtual Machine        SYS 
Oracle XDK                          SYS 
Oracle Database Java Packages       SYS 
OLAP Analytic Workspace             SYS 
Oracle OLAP API                     SYS

More information on how these users are connected to featured can be found in  Oracle 12c Security-Guide and in the support note “Oracle Created Database Users: Password, Usage and Files References (Doc ID 160861.1)”.

For Oracle 11g there’s a good overview on the website http://abcdba.com/abcdbaserver11gdefaultschema. You will find a list, how to safely remove a user. Please note the the commands are for Oracle 11g. The commands may have changed for Oracle 12c.

Helpful links:

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