Partition Pruning vs Partition-Wise Join

Question

Hi,
I am not sure if this is the right place for this question, but here it goes.
I am in a situation where in the begining I have to join two big tables without any where clauses. It is pretty much a Caretsian Product where a criteria meets (Internal Code), but I have to join all rows. (Seems like a good place for Partition-Wise Join).
Later I only need to update certain rows based on a key value (Customer ID, Region ID). (Good candidate for Partition Pruning).
What would be the best option. Is there a way to use both?
Assume that following:
Table 1 has the structure of
Customer ID
Internal Code
Other Data
There are about 1000 Customer ID. Each Customer ID has 1000 Internal Codes.
Table 2 has the structure of
Region ID
Internal Code
Other Data
There are about 5000 Region ID. Each Region ID has 1000 Internal Codes(same as Table 1).
I am currently thinking of doing a HASH PARTITION (8 partitions) on Customer ID for Table 1 and HASH PARTITION (8 partitions) on Region ID for Table 2.
The initial insert will take a long time, but when I go to update the joined data based on specific Customer ID, or Region ID atleast from one Table only one Partition will be used.
I would sincerely appreciate some advice from the gurus.
Thanks...

Answer 1

Hi,
I still don't understand what it is that you are trying to do.
Would it be possible for you to create a silly example with just a few rows
to show us what it is that you are trying to accomplish?
Then we can help you solve whatever problem it is that you are having.
create table t1(
   customer_id   number       not null
  ,internal_code varchar2(20) not null
  ,<other_columns>
  ,constraint t1_pk primary key(customer_id, internal_code)
create table t2(
   region_id number not null
  ,internal_code varchar2(20) not null
  ,<other_columns>
  ,constraint t2_pk primary key(region_id, internal_code)
insert into t1(customer_id, internal_code, ...) values(...);
insert into t1(customer_id, internal_code, ...) values(...);
insert into t2(region_id, internal_code, ...) values(...);
insert into t2(region_id, internal_code, ...) values(...);
select <the rating calculation>
   from t1 join t2 using(internal_code);