11gr1 interval partition issues

Question

1st problem.
How to delete the last non interval partition?
When I try it says it is the last non interval..
2nd
How to determine which partitions have the interval applied to them?
Where is the metadata for that? I am unable to find it.
3rd
Is it possible to alter a partition to a interval or non-interval partition type?
All help is appreciated.
Thanks,
Steven
Edited by: user12067909 on May 19, 2010 12:34 PM

Answer 1

user12067909 wrote:
Again HIGH_VALUE appears to have no involvement with intervals in 11GR1.This has nothing to do with HIGH_VALUE. Forget agout interval partitioning for a moment. Oracle does not allow partitioned tables that currently have no partitions. Regardless what type of partitioning you are using, table must have at least one partition. Therefore, you can't drop past partition. Now back to interval partitions. This type of partitioning has "named" partitions (like p0 in your case) and "unnamed" partitions dynamically created when you insert data. These "unnamed" partitions are not part of table definition:
SQL> create table t1p
  2  ( a    number,
  3    sdate date
  4  )
  5  partition by range(sdate)
  6  interval (numtodsinterval(1,'day'))
  7  (partition p0 values less than
  8   (to_date('12-apr-2009','dd-mon-yyyy'))
  9  )
10  /
Table created.
SQL> insert into t1p ( a,sdate )
  2  values ( 1,to_date('20100101','yyyymmdd'));
1 row created.
SQL> insert into t1p ( a,sdate )
  2  values ( 1,to_date('20090101','yyyymmdd'));
1 row created.
SQL> commit
  2  /
Commit complete.
SQL> 
SQL> select partition_name from user_tab_partitions where table_name = 'T1P'
  2  /
PARTITION_NAME
P0
SYS_P46
SQL> set long 10000
SQL> select dbms_metadata.get_ddl('TABLE','T1P') from dual
  2  /
DBMS_METADATA.GET_DDL('TABLE','T1P')
  CREATE TABLE "SCOTT"."T1P"
   (    "A" NUMBER,
        "SDATE" DATE
   ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
  STORAGE(
  BUFFER_POOL DEFAULT)
  TABLESPACE "USERS"
  PARTITION BY RANGE ("SDATE") INTERVAL (NUMTODSINTERVAL(1,'DAY'))
(PARTITION "P0"  VALUES LESS THAN (TO_DATE(' 2009-04-12 00:00:00', 'SYYYY-MM-DD
HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
DBMS_METADATA.GET_DDL('TABLE','T1P')
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
  TABLESPACE "USERS" NOCOMPRESS )
SQL> So in the sense that dynamically created partitions do not count, error message is misleading. There would not be any error if, for example, there would be two "named" partitions:
SQL> create table t1p
  2  ( a    number,
  3    sdate date
  4  )
  5  partition by range(sdate)
  6  interval (numtodsinterval(1,'day'))
  7  (partition p0 values less than
  8   (to_date('12-apr-2009','dd-mon-yyyy')),
  9   partition p1 values less than
10   (to_date('12-may-2009','dd-mon-yyyy'))
11  )
12  /
Table created.
SQL> alter table  t1p drop partition p0
  2  /
Table altered.
SQL> But now, as soon as we are down to one "named"partition:
SQL> alter table  t1p drop partition p1
  2  /
alter table  t1p drop partition p1
ERROR at line 1:
ORA-14758: Last partition in the range section cannot be dropped
SQL> SY.