In Oracle 12c R2 does LogMiner support Table/Column names longer than 30 characters?

NEW UPDATE

I confirmed a few days that this was a bug. Unfortunately, now the support team is telling me the following:

"It’s not a bug. As of 12.2 new types/features are only supported for dbms_rolling and golden gate." Conclusion, tables with names greater than 30 characters will not be supported on LogMiner, even if supplemental_logging is disabled. They are going to update the documentation. I will update the answer as long as I have more details regarding this.

SQL> select supplemental_log_data_min, supplemental_log_data_pk from v$database;

SUPPLEME SUP
-------- ---
YES YES

In this case, it will always show UNSUPPORTED for any DML operation when the table has a name with more than 30 characters.

SQL> select * from v$version ;

BANNER
--------------------------------------------------------------------------------
    CON_ID
----------
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
         0

PL/SQL Release 12.2.0.1.0 - Production
         0

CORE    12.2.0.1.0      Production
         0


BANNER
--------------------------------------------------------------------------------
    CON_ID
----------
TNS for Linux: Version 12.2.0.1.0 - Production
         0

NLSRTL Version 12.2.0.1.0 - Production
         0

Let's start the test case

SQL> create table cpl_rep.my_table_with_a_very_long_name_with_more ( c1 number );

Table created.

SQL> insert into cpl_rep.my_table_with_a_very_long_name_with_more values ( 1 ) ;

1 row created.

SQL> insert into cpl_rep.my_table_with_a_very_long_name_with_more values ( 2 ) ;

1 row created

SQL> commit;

Commit complete.

SQL> select length(table_name) from dba_tables where table_name =  upper('my_table_with_a_very_long_name_with_more');

LENGTH(TABLE_NAME)
------------------
                40

SQL>

Then I start my logminer session, first I switch my logfile

SQL> alter system switch logfile ;

System altered.

SQL> exit

Then I enter again to open my logminer session

SQL> exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo1/redo11.ora' , 1);
 exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo2/redo21.ora' , 1);
 exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo1/redo12.ora' , 1);
 exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo2/redo22.ora' , 1);
 exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo1/redo13.ora' , 1);
 exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo2/redo23.ora' , 1);

PL/SQL procedure successfully completed.

SQL>
PL/SQL procedure successfully completed.

SQL>
PL/SQL procedure successfully completed.

SQL>
PL/SQL procedure successfully completed.

SQL>
PL/SQL procedure successfully completed.

SQL>
PL/SQL procedure successfully completed.


SQL> exec dbms_logmnr.start_logmnr(options=>dbms_logmnr.dict_from_online_catalog);

PL/SQL procedure successfully completed.

SQL>  select count(*) from v$logmnr_contents where seg_name =  upper('my_table_with_a_very_long_name_with_more');

  COUNT(*)
----------
         3

SQL> select operation,seg_name,sql_redo from v$logmnr_contents where seg_name =  upper('my_table_with_a_very_long_name_with_more');

OPERATION
--------------------------------
SEG_NAME
--------------------------------------------------------------------------------
SQL_REDO
--------------------------------------------------------------------------------
DDL
MY_TABLE_WITH_A_VERY_LONG_NAME_WITH_MORE
create table cpl_rep.my_table_with_a_very_long_name_with_more ( c1 number );

OPERATION
--------------------------------
SEG_NAME
--------------------------------------------------------------------------------
SQL_REDO
--------------------------------------------------------------------------------

INSERT
MY_TABLE_WITH_A_VERY_LONG_NAME_WITH_MORE
insert into "CPL_REP"."MY_TABLE_WITH_A_VERY_LONG_NAME_WITH_MORE"("C1") values ('
1');

OPERATION
--------------------------------
SEG_NAME
--------------------------------------------------------------------------------
SQL_REDO
--------------------------------------------------------------------------------
INSERT
MY_TABLE_WITH_A_VERY_LONG_NAME_WITH_MORE
insert into "CPL_REP"."MY_TABLE_WITH_A_VERY_LONG_NAME_WITH_MORE"("C1") values ('
2');

So, as you can see, in my case, there is no such thing as a limitation for 30 characters when the element affected is a table.

Let's see when the element is a column

SQL> create table cpl_rep.table_with_name_greater_than_30_characters ( column_greater_than_30_characters_test_case number );

Table created.

SQL> select length('table_with_name_greater_than_30_characters') , length('column_greater_than_30_characters_test_case') from dual ;

LENGTH('TABLE_WITH_NAME_GREATER_THAN_30_CHARACTERS')
----------------------------------------------------
LENGTH('COLUMN_GREATER_THAN_30_CHARACTERS_TEST_CASE')
-----------------------------------------------------
                                                  42
                                                   43



SQL> insert into cpl_rep.table_with_name_greater_than_30_characters values ( 1 );

1 row created.

SQL> r
  1* insert into cpl_rep.table_with_name_greater_than_30_characters values ( 1 )

1 row created.

SQL> commit;

Commit complete.

SQL> insert into cpl_rep.table_with_name_greater_than_30_characters values ( 2 );

1 row created.

SQL> r
  1* insert into cpl_rep.table_with_name_greater_than_30_characters values ( 2 )

1 row created.

SQL> commit;

Commit complete.

SQL> delete from cpl_rep.table_with_name_greater_than_30_characters where column_greater_than_30_characters_test_case=2 ;

2 rows deleted.

SQL> commit;

Commit complete.

$ sqlplus / as sysdba

SQL*Plus: Release 12.2.0.1.0 Production on Sun Jul 19 17:07:58 2020

Copyright (c) 1982, 2016, Oracle.  All rights reserved.
    
Connected to:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production

SQL> exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo1/redo11.ora' , 1);
     exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo2/redo21.ora' , 1);
     exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo1/redo12.ora' , 1);
     exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo2/redo22.ora' , 1);
     exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo1/redo13.ora' , 1);
     exec dbms_logmnr.add_logfile('/bbdd_odcgrc1r/redo2/redo23.ora' , 1);
PL/SQL procedure successfully completed.

SQL>
PL/SQL procedure successfully completed.

SQL>
PL/SQL procedure successfully completed.

SQL>
PL/SQL procedure successfully completed.

SQL>
PL/SQL procedure successfully completed.

SQL>

PL/SQL procedure successfully completed.

SQL>
SQL> exec dbms_logmnr.start_logmnr(options=>dbms_logmnr.dict_from_online_catalog);

PL/SQL procedure successfully completed.

SQL> select count(*) from v$logmnr_contents where seg_owner = 'CPL_REP' and seg_name = upper('table_with_name_greater_than_30_characters') ;

  COUNT(*)
----------
         3

SQL> select operation,seg_name,sql_redo from v$logmnr_contents where seg_owner = 'CPL_REP' and seg_name = upper('table_with_name_greater_than_30_characters') ;

OPERATION
--------------------------------
SEG_NAME
--------------------------------------------------------------------------------
SQL_REDO
--------------------------------------------------------------------------------
DDL
TABLE_WITH_NAME_GREATER_THAN_30_CHARACTERS
create table cpl_rep.table_with_name_greater_than_30_characters ( column_greater
_than_30_characters_test_case number );

INSERT
TABLE_WITH_NAME_GREATER_THAN_30_CHARACTERS

OPERATION
--------------------------------
SEG_NAME
--------------------------------------------------------------------------------
SQL_REDO
--------------------------------------------------------------------------------
insert into "CPL_REP"."TABLE_WITH_NAME_GREATER_THAN_30_CHARACTERS"("COLUMN_GREAT
ER_THAN_30_CHARACTERS_TEST_CASE") values ('1');

INSERT
TABLE_WITH_NAME_GREATER_THAN_30_CHARACTERS
insert into "CPL_REP"."TABLE_WITH_NAME_GREATER_THAN_30_CHARACTERS"("COLUMN_GREAT
ER_THAN_30_CHARACTERS_TEST_CASE") values ('1');

OPERATION
--------------------------------
SEG_NAME
--------------------------------------------------------------------------------
SQL_REDO
--------------------------------------------------------------------------------

So, in my case, I can operate with both columns and tables greater than 30 characters.

UPDATE

After the comments sections, I decided to try the test with SUPPLEMENTAL_LOGGING and it works. However, when I add SUPPLEMENTAL_LOGGING for all columns PK, then it does not work

SQL> ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;

Database altered.

SQL> select supplemental_log_data_min, supplemental_log_data_pk from v$database;

SUPPLEME SUP
-------- ---
YES      NO

SQL> ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY) COLUMNS;

Database altered.

SQL>  select supplemental_log_data_min, supplemental_log_data_pk from v$database;

SUPPLEME SUP
-------- ---
YES      YES

SQL> create table cpl_rep.my_test_with_a_very_very_long_name_for_test ( c1 number ) ;

Table created.

   
SQL> insert into cpl_rep.my_test_with_a_very_very_long_name_for_test values ( 1 ) ;

1 row created.

SQL> insert into cpl_rep.my_test_with_a_very_very_long_name_for_test values ( 2 ) ;

1 row created.

SQL> commit ;

Commit complete.

SQL> insert into cpl_rep.my_test_with_a_very_very_long_name_for_test values ( 3 ) ;

1 row created.

SQL> commit;

Commit complete.


SQL> delete from cpl_rep.my_test_with_a_very_very_long_name_for_test where c1 = 3 ;

1 row deleted.

SQL>

Switch logfile and start logminer. The contents show now the value UNSUPPORTED.

SQL> select sql_redo , operation, seg_name from v$logmnr_contents where seg_name = upper('my_test_with_a_very_very_long_name_for_test') ;

SQL_REDO
--------------------------------------------------------------------------------
OPERATION
--------------------------------
SEG_NAME
--------------------------------------------------------------------------------
create table cpl_rep.my_test_with_a_very_very_long_name_for_test ( c1 number ) ;
DDL
MY_TEST_WITH_A_VERY_VERY_LONG_NAME_FOR_TEST

Unsupported
UNSUPPORTED
MY_TEST_WITH_A_VERY_VERY_LONG_NAME_FOR_TEST

SQL_REDO
--------------------------------------------------------------------------------
OPERATION
--------------------------------
SEG_NAME
--------------------------------------------------------------------------------

Unsupported
UNSUPPORTED
MY_TEST_WITH_A_VERY_VERY_LONG_NAME_FOR_TEST

Unsupported
UNSUPPORTED

SQL_REDO
--------------------------------------------------------------------------------
OPERATION
--------------------------------
SEG_NAME
--------------------------------------------------------------------------------
MY_TEST_WITH_A_VERY_VERY_LONG_NAME_FOR_TEST

Unsupported
UNSUPPORTED
MY_TEST_WITH_A_VERY_VERY_LONG_NAME_FOR_TEST


SQL>

The key is clearly SUPPLEMENTAL_LOGGING PK, and also that only affects to DML operations, as DDL show the real command executed.

Tags:

Oracle

Oracle12C

Logminer

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