Data partitioning & Index partitioning

Question

Hi,
I have the following questions about implementing ILM on a existing table consisting of millions of rows and with index partitioning...
1) how can data be partitioned when index partitioning exists?
2) what happens to the indexes when the table data is partitioned (per month)?
3) when the data is partitioned, will the indexes AUTOMATICALLY reorganize according to the data partitions? otherwise, what has to be done to the index partitioning?
Thanks.

Answer 1

Hi,
The best way to do this would be to create a new table with the desired partitioning and build a local index on this. If it is possible to take the table offline and recreate all its dependencies manually, then the new table can simply be renamed to the old table. If the table needs to stay online, you may want to look into using online redefinition with dbms_redefinition. Below I have shown a sample of how you could recreate the table and index:
Original definitions -
create table my_test_table (id number, val number);
create index my_test_table_idx
on my_test_table (id)
global partition by range (id)
(partition p1_ind values less than (5),
partition p2_ind values less than (maxvalue));
New definitions -
create table my_test_table_new (id number, val number)
partition by range (id)
(partition p1_tab values less than (5),
partition p2_tab values less than (maxvalue));
create index my_test_table_idx_new
on my_test_table_new (id)
local;
Renaming -
alter table my_test_table rename to my_test_table_old;
alter table my_test_table_new rename to my_test_table;
alter index my_test_table_idx rename to my_test_table_idx_old;
alter index my_test_table_idx_new rename to my_test_table_idx;