oracle subpartition template

Oracle subpartition template is a feature that allows you to create subpartitions with a specific pattern or template. This can be useful when you have a large number of subpartitions to create, and you want to automate the process.

To use subpartition template, you need to first create the partitioned table with the desired partitioning scheme. Then, you can use the ALTER TABLE statement with the ADD SUBPARTITION clause to create subpartitions using the template.

Here is an example:

CREATE TABLE sales (
    sale_id NUMBER,
    sale_date DATE,
    amount NUMBER
)
PARTITION BY RANGE (sale_date)
SUBPARTITION BY HASH (sale_id)
SUBPARTITIONS 4
(
    PARTITION sales_q1 VALUES LESS THAN (TO_DATE('01-APR-2020', 'DD-MON-YYYY')),
    PARTITION sales_q2 VALUES LESS THAN (TO_DATE('01-JUL-2020', 'DD-MON-YYYY')),
    PARTITION sales_q3 VALUES LESS THAN (TO_DATE('01-OCT-2020', 'DD-MON-YYYY')),
    PARTITION sales_q4 VALUES LESS THAN (MAXVALUE)
);

ALTER TABLE sales ADD SUBPARTITION sales_q1_01 TEMPLATE
(
    SUBPARTITION sales_q1_01 VALUES LESS THAN (TO_DATE('02-APR-2020', 'DD-MON-YYYY'))
);

In this example, we first create a partitioned table with quarterly partitions and 4 hash subpartitions per partition. Then, we use the ALTER TABLE statement to add a subpartition to the "sales_q1" partition using the subpartition template. The template specifies that the subpartition should have a name of "sales_q1_01" and should store rows with a "sale_date" value less than April 2, 2020. This will create a subpartition for every quarter of the year with the same naming convention and range of values.