Re: bitmapped secondary indexes on an IOT partitioned file.
- From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 14 Aug 2006 18:13:42 +0100
Running under 10.2.0.1
drop table pt_iot;
create table pt_iot (
customer_id number(12),
ref_date date,
expenditure number(6,2),
constraint iot_pk primary key (customer_id, ref_date)
)
organization index
mapping table
partition by range (ref_date)
(
partition pt_2000 values less than (to_date('01-jan-2001','dd-mon-yyyy')),
partition pt_2001 values less than (to_date('01-jan-2002','dd-mon-yyyy')),
partition pt_2002 values less than (to_date('01-jan-2003','dd-mon-yyyy')),
partition pt_2003 values less than (to_date('01-jan-2004','dd-mon-yyyy')),
partition pt_2004 values less than (to_date('01-jan-2005','dd-mon-yyyy'))
)
;
SQL> select table_name,partition_name from user_tab_partitions;
TABLE_NAME PARTITION_NAME
-------------------- --------------------
SYS_IOT_MAP_63206 PT_2000
SYS_IOT_MAP_63206 PT_2001
SYS_IOT_MAP_63206 PT_2002
SYS_IOT_MAP_63206 PT_2003
SYS_IOT_MAP_63206 PT_2004
PT_IOT PT_2000
PT_IOT PT_2001
PT_IOT PT_2002
PT_IOT PT_2003
PT_IOT PT_2004
(And, as you said, 9.2.0.6 with the same script gives:
create table pt_iot (
*
ERROR at line 1:
ORA-25182: feature not currently available for index-organized tables
Regards
Jonathan Lewis
http://www.oracle.com/technology/community/oracle_ace/ace1.html#lewis
The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
Cost Based Oracle: Fundamentals
http://www.jlcomp.demon.co.uk/cbo_book/ind_book.html
----- Original Message -----
From: "Thomas Day" <tomday2@xxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Monday, August 14, 2006 4:57 PM
Subject: bitmapped secondary indexes on an IOT partitioned file.
I've looked at the documentation and I believe that I need Oracle 10g to use
the mapping table with a partitioned IOT.
I tried it with 9.2 and got "ORA-25182: feature not currently available for
index-organized tables"
I looked at the 10.2 documentation and it says "Oracle Database creates the
mapping table or mapping table partition in the same tablespace as its
parent index-organized table or partition." Now, I'm assuming that this
means a partitioned IOT; however, a close reading could cause one to believe
that it supports an unpartitioned IOT OR a heap partitioned table.
I don't have 10.2 and won't for a while. Does anybody have experience with
this in 10.2?
I'm planning a data warehouse and I'd like to make my fact tables IOT. I'd
further like to partition them by fiscal year, since most queries will be
restricted to a single fiscal year. But I can't restrict the queries to
just using the primary key (or a prefix of it) so I'd like to have bitmapped
secondary indexes (low cardinality). For that I need to create a mapping
table with the fact table. I can't do that in 9.2. I'd like to know that I
will be able to in 10.2.
Thanks
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