I have my plsql block as below:
DECLARE
CURSOR cdrimei IS select distinct(table_name) as tname from user_tab_columns
where column_name = 'CALLED_NUMBER_TIPO_ABONADO' and table_name not like '%_V' order by table_name;
BEGIN
FOR i in cdrimei
LOOP
execute immediate 'ALTER TABLE '||i.tname||' DROP (IMEI_CHAIN ,IMEI_STOLEN)';
execute immediate 'ALTER TABLE '||i.tname||' ADD (IMEI_CHAIN varchar2(255),IMEI_STOLEN varchar2(255))';
END LOOP;
END;
/
After executing this I am facing the below error:
ORA-39726: unsupported add/drop column operation on compressed tables
I don't understand the meaning of compressed tables.