mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-28 18:42:26 +00:00
31 lines
960 B
SQL
31 lines
960 B
SQL
DROP TABLE IF EXISTS t_sparse_mutation;
|
|
|
|
CREATE TABLE t_sparse_mutation (id UInt64, v UInt64)
|
|
ENGINE = MergeTree ORDER BY id
|
|
SETTINGS ratio_of_defaults_for_sparse_serialization = 0.9;
|
|
|
|
INSERT INTO t_sparse_mutation select number, if (number % 21 = 0, number, 0) FROM numbers(10000);
|
|
|
|
SET mutations_sync = 2;
|
|
|
|
DELETE FROM t_sparse_mutation WHERE id % 2 = 0;
|
|
|
|
SELECT count(), sum(v) FROM t_sparse_mutation;
|
|
|
|
SELECT sum(has_lightweight_delete) FROM system.parts
|
|
WHERE database = currentDatabase() AND table = 't_sparse_mutation' AND active;
|
|
|
|
ALTER TABLE t_sparse_mutation UPDATE v = v * 2 WHERE id % 5 = 0;
|
|
ALTER TABLE t_sparse_mutation DELETE WHERE id % 3 = 0;
|
|
|
|
SELECT count(), sum(v) FROM t_sparse_mutation;
|
|
|
|
OPTIMIZE TABLE t_sparse_mutation FINAL;
|
|
|
|
SELECT sum(has_lightweight_delete) FROM system.parts
|
|
WHERE database = currentDatabase() AND table = 't_sparse_mutation' AND active;
|
|
|
|
SELECT count(), sum(v) FROM t_sparse_mutation;
|
|
|
|
DROP TABLE t_sparse_mutation;
|