How to add the column to the compressed table

Hi gurus,

Can someone help me how to add a column to compressed tables


Thanks in advance

The only difference is if added column has a default value. In this case:

SQL> create table tbl(id number,val varchar2(10))
  2  /

Table created.

SQL> insert into tbl
  2  select level,lpad('X',10,'X')
  3  from dual
  4  connect by level <= 100000
  5  /

100000 rows created.

SQL> select bytes
  2  from user_segments
  3  where segment_name = 'TBL'
  4  /

     BYTES
----------
   3145728

SQL> alter table tbl move compress
  2  /

Table altered.

SQL> select bytes
  2  from user_segments
  3  where segment_name = 'TBL'
  4  /

     BYTES
----------
   2097152

SQL> alter table tbl add name varchar2(5) default 'NONE'
  2  /
alter table tbl add name varchar2(5) default 'NONE'
                    *
ERROR at line 1:
ORA-39726: unsupported add/drop column operation on compressed tables

SQL> alter table tbl add name varchar2(5)
  2  /

Table altered.

SQL> update tbl set name = 'NONE'
  2  /

100000 rows updated.

SQL> commit
  2  /

Commit complete.

SQL> select bytes
  2  from user_segments
  3  where segment_name = 'TBL'
  4  /

     BYTES
----------
   7340032

SQL> select compression from user_tables where table_name = 'TBL'
  2  /

COMPRESS
--------
ENABLED

SQL> alter table tbl move compress
  2  /

Table altered.

SQL> select bytes
  2  from user_segments
  3  where segment_name = 'TBL'
  4  /

     BYTES
----------
   2097152

SQL> 

SY.

Tags: Database

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