Table Modifications in Logical Standby

Question

Can I add a new column to a table in a logical standby for a table which is actively synchronized from the primary?  In essence, I would like to add a column to the table in the logical standby, but not add the column to the corresponding table in the primary DB.

Answer 1

OK;
So I have convert a Physical Standby to a Logical database.
This table has been created:
CREATE TABLE RSTARS
  ID            NUMBER,
  FIRST_NAME    VARCHAR2(50 BYTE),
  LAST_NAME     VARCHAR2(50 BYTE)
TABLESPACE OTN_TEST
PCTUSED    40
PCTFREE    10
INITRANS   1
MAXTRANS   255
STORAGE    (
            INITIAL          64K
            NEXT             1M
            MINEXTENTS       1
            MAXEXTENTS       UNLIMITED
            PCTINCREASE      0
            FREELISTS        1
            FREELIST GROUPS  1
            BUFFER_POOL      DEFAULT
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE BIGSHOW.RSTARS ADD (
  CONSTRAINT RSTARS_PK
  PRIMARY KEY
  (ID));
This data exist in the table:
set linesize 200
select * from rstars;
        ID FIRST_NAME                                         LAST_NAME                                  
         1 Robert                                             Plant                                      
         2 Jimmy                                              Page                                       
2 rows selected.
On the Primary add another row of data
INSERT INTO RSTARS
  ID,
  FIRST_NAME,
  LAST_NAME
VALUES
  3,
  'Ted',
  'Nugent'
commit;
Connect to the logical Standby and check for it.
set linesize 200
select * from rstars;
       ID FIRST_NAME                                         LAST_NAME                                  
         1 Robert                                             Plant                                      
         2 Jimmy                                              Page                                       
         3 Ted                                                Nugent                                     
3 rows selected.
MORE TO COME
So I will add the columns one by one and test after each
Add varchar2 to the table:
SQL> alter database stop logical standby  apply;
Database altered.
SQL> alter session disable guard;
Session altered.
SQL> ALTER TABLE BIGSHOW.RSTARS ADD (CITY  VARCHAR2(15));
Table altered.
SQL> alter session enable guard;
Session altered.
SQL> alter database start logical standby  apply;
Database altered.
SQL>
INSERT INTO RSTARS
  ID,
  FIRST_NAME,
  LAST_NAME
VALUES
  4,
  'Geddy',
  'Lee'
commit;
LOGSTDBY Apply process AS02 server id=2 pid=38 OS id=31938 stopped
Errors in file /u01/app/oracle/diag/rdbms/stest/STEST/trace/STEST_as01_31936.trc:
ORA-26676: Table 'BIGSHOW.RSTARS' has 3 columns in the LCR and 4 columns in the replicated site
Fri Aug 09 13:34:18 2013
LOGMINER: session#=1 (Logical_Standby$), builder MS01 pid=34 OS id=31930 sid=34 stopped
So you have good reason to be concerned. Thanks for the question. I have it in my notes, so I would have bet and lost!
I thinking you can create a child table as a work around.
You were right about this too:
SQL> select * from DBA_LOGSTDBY_UNSUPPORTED;
no rows selected
ORA-26676 returns zero documents when I search Oracle Support today.
Best Regards
mseberg
How to fix
To correct all I did was this and Oracle added the row:
SQL> alter database stop logical standby  apply;
Database altered.
SQL> alter session disable guard;
Session altered.
SQL> ALTER TABLE BIGSHOW.RSTARS DROP COLUMN CITY;
Table altered.
SQL> alter session enable guard;
Session altered.
SQL> alter database start logical standby  apply;
Database altered.
SQL>
set linesize 200
select * from rstars;
        ID FIRST_NAME                                         LAST_NAME                                     
         1 Robert                                             Plant                                         
         2 Jimmy                                              Page                                          
         3 Ted                                                Nugent                                        
         4 Geddy                                              Lee                                           
4 rows selected.
Message was edited by: mseberg  ( as you can tell I'm from the 70's )