Use securefile for new partitions made by interval partitioning

Question

I am using Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production.
I have a range partitioned table having lobs as basicfile. Due to storage issue and other business constraints , it is determined not to change existing lobs to securefile.
However ,we want new lobs to be in securefile and alter table to have  interval partition+.
While researching, I found sql to change lob in range partition to securefile by using
alter table t1 add partition t1_p2 value less than (10000) lob (col3) store as securefile (tablespace tbs_sf1)Please advise me to do similar  in case of interval partition.
Many thanks for assistance.

Answer 1

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Can we modify default attribute of lob to store as securefile for partition table.
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Yes - that is what I meant in my reply. But it seems I may have been wrong since after further testing I was able to find syntax that would appear to work for you. Please test this and post the results.
The line
LOB(CLOB_DATA) store as securefileshould store intervals as securefile. But it accepted syntax to store the predefined partitions as basicfile
  PARTITION P0 VALUES LESS THAN
  (TO_DATE(' 2008-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
  LOB(CLOB_DATA) store as basicfile,I don't have time to test with data until next week. But if this works you could predefine all of your partitions that you want to use basicfile for and then use interval partitions for the ones you want securefile for. That sounded like what you were trying to do.
DROP TABLE INTERVAL_SALES1 CASCADE CONSTRAINTS;
CREATE TABLE INTERVAL_SALES1
  PROD_ID        NUMBER(6),
  CUST_ID        NUMBER,
  TIME_ID        DATE,
  CHANNEL_ID     CHAR(1 BYTE),
  PROMO_ID       NUMBER(6),
  QUANTITY_SOLD  NUMBER(3),
  AMOUNT_SOLD    NUMBER(10,2),
  CLOB_DATA      CLOB
LOB(CLOB_DATA) store as securefile
PARTITION BY RANGE (TIME_ID)
INTERVAL( NUMTOYMINTERVAL(1,'MONTH'))
  PARTITION P0 VALUES LESS THAN
  (TO_DATE(' 2008-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
  LOB(CLOB_DATA) store as basicfile,
  PARTITION P1 VALUES LESS THAN (TO_DATE(' 2009-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')), 
  PARTITION P2 VALUES LESS THAN (TO_DATE(' 2009-07-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')),
  PARTITION P3 VALUES LESS THAN (TO_DATE(' 2010-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
)Post the results of any testing you do.