Drops one or more partitions from an existing table.

Syntax

Description

Drops one or more table partitions.

Just like with columns dropping of partitions is a non-blocking and non-waiting operation. While being atomic for a single partitions, dropping of multiple partitions is in itself non-atomic. Drop partition will bail on the first failure and will not continue with the list.

:::note

The last partition (active partition) cannot be removed. This will be implemented in a future release.

:::

Drop partition by name

Partition name must match the name of the directory for the given partition.

Naming convention for partition directories is as follows:

Examples

--DAY
ALTER TABLE measurements DROP PARTITION LIST '2019-05-18';
--MONTH
ALTER TABLE measurements DROP PARTITION LIST '2019-05';
--YEAR
ALTER TABLE measurements DROP PARTITION LIST '2019';

ALTER TABLE measurements DROP PARTITION LIST '2018','2019';

Drop partitions using boolean expression

Drops partitions based on a boolean expression on the designated timestamp column.

Examples

ALTER TABLE measurements
DROP PARTITION
WHERE timestamp = to_timestamp('2019-01-01:00:00:00', 'yyyy-MM-dd:HH:mm:ss');

ALTER TABLE measurements
DROP PARTITION
WHERE timestamp < to_timestamp('2018-01-01:00:00:00', 'yyyy-MM-dd:HH:mm:ss');