“user does not exist ” when calling DBMS_LOGMNR.START_LOGMNR

Question

I have a CDB user called "MYADMIN" and I'm trying to make it connect to log miner.

-- enable calling admin username on CDB 
ALTER SESSION set "_ORACLE_SCRIPT"=true
/
-- create unique table space for admin
CREATE TABLESPACE myadmints DATAFILE '/path/to/admints.dbf' SIZE 20M AUTOEXTEND ON
/
-- create admin user on CDB
CREATE USER myadmin IDENTIFIED BY P@ssw0rd DEFAULT TABLESPACE myadmints QUOTA UNLIMITED ON myadmints ACCOUNT UNLOCK
/
-- allow access to all PDBs to the admin user
ALTER USER myadmin SET CONTAINER_DATA=ALL CONTAINER=CURRENT
/ 
-- grant needed permissions
GRANT DBA to myadmin 
GRANT CREATE SESSION TO myadmin 
GRANT CREATE TABLE TO myadmin 
GRANT EXECUTE_CATALOG_ROLE TO myadmin 
GRANT EXECUTE ON DBMS_LOGMNR TO myadmin 
GRANT SELECT ON V_$DATABASE TO myadmin 
GRANT SELECT ON V_$LOGMNR_CONTENTS TO myadmin 
GRANT SELECT ON V_$ARCHIVED_LOG TO myadmin 
GRANT SELECT ON V_$LOG TO myadmin 
GRANT SELECT ON V_$LOGFILE TO myadmin 
GRANT RESOURCE, CONNECT TO myadmin 

I've selected one line from 'v$archived_log' and trying to load the file.

BEGIN
  DBMS_LOGMNR.ADD_LOGFILE(LogFileName=>'/path/to/archive/ARC000011_1061542581',Options=>DBMS_LOGMNR.new);
  DBMS_LOGMNR.START_LOGMNR(StartScn=>3083464, EndScn=>3388245, Options=>DBMS_LOGMNR.DICT_FROM_ONLINECATALOG+DBMS_LOGMNR.NO_ROW_ID_IN_STMT);
END;

I can run it from the sys as sysdba user, but when I run it from my "myadmin" user I'm getting:

Error report - 
ORA-01435: user does not exist
ORA-06512: at "SYS.DBMS_LOGMNR", line 72
ORA-06512: at line 3
01435. 00000 - "user does not exist"
*Cause:
*Action:

The error is about the START_LOGMNR line when I remove it there is no error.

Which privilege I'm missing?

Answer 1

That is what you get when you break and ignore the basic concepts of the CDB architecture and common users and use unsupported "workarounds" (ALTER SESSION set "_ORACLE_SCRIPT"=true).

Above code works flawlessly when you create the user in a supported way.

-- create admin user on CDB
CREATE USER c##myadmin IDENTIFIED BY myadmin DEFAULT TABLESPACE users QUOTA UNLIMITED ON users ACCOUNT UNLOCK
/
-- allow access to all PDBs to the admin user
ALTER USER c##myadmin SET CONTAINER_DATA=ALL CONTAINER=CURRENT
/ 
-- grant needed permissions
GRANT DBA to c##myadmin                            ;
GRANT CREATE SESSION TO c##myadmin                 ;
GRANT CREATE TABLE TO c##myadmin                   ;
GRANT EXECUTE_CATALOG_ROLE TO c##myadmin           ;
GRANT EXECUTE ON DBMS_LOGMNR TO c##myadmin         ;
GRANT SELECT ON V_$DATABASE TO c##myadmin          ;
GRANT SELECT ON V_$LOGMNR_CONTENTS TO c##myadmin   ;
GRANT SELECT ON V_$ARCHIVED_LOG TO c##myadmin      ;
GRANT SELECT ON V_$LOG TO c##myadmin               ;
GRANT SELECT ON V_$LOGFILE TO c##myadmin           ;
GRANT RESOURCE, CONNECT TO c##myadmin              ;

Then:

sqlplus c##myadmin/myadmin

BEGIN
  DBMS_LOGMNR.ADD_LOGFILE(LogFileName=>'/fra/RYCDB19/archivelog/2021_01_18/o1_mf_1_130_j0bo2onq_.arc',Options=>DBMS_LOGMNR.new);
  DBMS_LOGMNR.START_LOGMNR(Options=>DBMS_LOGMNR.DICT_FROM_ONLINE_CATALOG+DBMS_LOGMNR.NO_ROWID_IN_STMT);
END;
/

PL/SQL procedure successfully completed.

SQL> select count(*) from v$logmnr_contents;

  COUNT(*)
----------
    159587

Whenever you use ALTER SESSION set "_ORACLE_SCRIPT"=true to create your own users and objects, they have their ORACLE_MAINTAINED property set to Y. This is not supported and can break functionality of features.