AVOID Subpartition(list) to be created when Splitting Main Partition(range)

Question

I have created a table structure as below:
CREATE TABLE TEST_SUBPARTITIONS_1
RECORD_ID INTEGER NOT NULL,
SUB_ID VARCHAR2(100),
COBDATE DATE,
DESC VARCHAR2(2000)
PARTITION BY RANGE (COBDATE)
SUBPARTITION BY list(SUB_ID)
PARTITION INITIAL_PARTITION VALUES LESS THAN (TO_DATE(' 2200-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
TABLESPACE TBS_DATA
PCTFREE 10
INITRANS 1
MAXTRANS 255
STORAGE
INITIAL 64K
NEXT 1M
MINEXTENTS 1
MAXEXTENTS UNLIMITED
(SUBPARTITION INITIAL_SUBPARTITION VALUES ('INITIAL_DUMMY_SUB_ID') TABLESPACE TBS_DATA
CREATE UNIQUE INDEX TEST_SUBPARTITIONS_1_PK ON TEST_SUBPARTITIONS_1 (COBDATE, RECORD_ID, SUB_ID) LOCAL;
ALTER TABLE TEST_SUBPARTITIONS_1 ADD CONSTRAINT TEST_SUBPARTITIONS_1_PK PRIMARY KEY (COBDATE, RECORD_ID, SUB_ID);
I am partitioning the table based on range (COBDATE) and subpartitioning based on list (SUB_ID).
The table now is created with initial partitions and initial subpartition.
We are splitting the partitions in our procedure as below
ALTER TABLE TEST_SUBPARTITIONS_1 SPLIT PARTITION
TST_SUB_R21001231 AT (TO_DATE(20130220,'YYYYMMDD') ) INTO
     (PARTITION TST_SUB_R20130219 TABLESPACE TBS_DATA, PARTITION TST_SUB_R21001231)
The partition is getting split correctly with new partition as
TST_SUB_R20130219, but the subpartition is also created automatically with some 'SYS' name.
(i.e Name: SYS_SUBP693 , Values: INITIAL_DUMMY_SUB_ID)
This happens after every split of range by COBDATE.
Here it has created as below:
Partition          SubPartition
TST_SUB_R21001231     INITIAL_SUBPARTITION
TST_SUB_R20130219     SYS_SUBP693
TST_SUB_R20130220     SYS_SUBP694
TST_SUB_R20130221     SYS_SUBP695
I want to AVOID splitting subpartition when I split the main partition
i.e a SYS subpartition should not be created when I split the partition for COBDATE.
Let me know how do I avoid this in main "alter statement" above?
Any other solution?     I do not want to drop the SYS subpartition later, instead want it to avoid creating only when I split the partition.

Answer 1

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I want to AVOID splitting subpartition when I split the main partition
i.e a SYS subpartition should not be created when I split the partition for COBDATE.
Let me know how do I avoid this in main "alter statement" above?
Any other solution? I do not want to drop the SYS subpartition later, instead want it to avoid creating only when I split the partition.
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The subpartitions aren't being split. Oracle is creating new subpartitions for the new partition. The subpartitions need to exist since that is where the data is stored.
You can avoid the SYS prefix on the name though by using a different naming convention.
See the 'Splitting a *-List Partition' section of the VLDB and Partitioning Guide
http://docs.oracle.com/cd/E11882_01/server.112/e25523/part_admin002.htm#i1008028
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The ALTER TABLE ... SPLIT PARTITION statement provides no means of specifically naming subpartitions resulting from the split of a partition in a composite partitioned table. However, for those subpartitions in the parent partition with names of the form partition name_subpartition name, the database generates corresponding names in the newly created subpartitions using the new partition names. All other subpartitions are assigned system generated names of the form SYS_SUBPn. System generated names are also assigned for the subpartitions of any partition resulting from the split for which a name is not specified. Unnamed partitions are assigned a system generated partition name of the form SYS_Pn.