Set up docs MCPThese settings are available in system.settings and are autogenerated from source.
alter_move_to_space_execute_async
Type
Bool
Default
0
Execute ALTER TABLE MOVE … TO [DISK|VOLUME] asynchronously
alter_partition_verbose_result
Type
Bool
Default
0
Enables or disables the display of information about the parts to which the manipulation operations with partitions and parts have been successfully applied. Applicable to ATTACH PARTITION|PART and to FREEZE PARTITION.
Possible values:
- 0 — disable verbosity.
- 1 — enable verbosity.
Example
CREATE TABLE test(a Int64, d Date, s String) ENGINE = MergeTree PARTITION BY toYYYYMDECLARE(d) ORDER BY a;
INSERT INTO test VALUES(1, '2021-01-01', '');
INSERT INTO test VALUES(1, '2021-01-01', '');
ALTER TABLE test DETACH PARTITION ID '202101';
ALTER TABLE test ATTACH PARTITION ID '202101' SETTINGS alter_partition_verbose_result = 1;
┌─command_type─────┬─partition_id─┬─part_name────┬─old_part_name─┐
│ ATTACH PARTITION │ 202101 │ 202101_7_7_0 │ 202101_5_5_0 │
│ ATTACH PARTITION │ 202101 │ 202101_8_8_0 │ 202101_6_6_0 │
└──────────────────┴──────────────┴──────────────┴───────────────┘
ALTER TABLE test FREEZE SETTINGS alter_partition_verbose_result = 1;
┌─command_type─┬─partition_id─┬─part_name────┬─backup_name─┬─backup_path───────────────────┬─part_backup_path────────────────────────────────────────────┐
│ FREEZE ALL │ 202101 │ 202101_7_7_0 │ 8 │ /var/lib/clickhouse/shadow/8/ │ /var/lib/clickhouse/shadow/8/data/default/test/202101_7_7_0 │
│ FREEZE ALL │ 202101 │ 202101_8_8_0 │ 8 │ /var/lib/clickhouse/shadow/8/ │ /var/lib/clickhouse/shadow/8/data/default/test/202101_8_8_0 │
└──────────────┴──────────────┴──────────────┴─────────────┴───────────────────────────────┴─────────────────────────────────────────────────────────────┘alter_sync
Aliases: replication_alter_partitions_sync
Type
UInt64
Default
1
Allows you to specify the wait behavior for actions that are to be executed on replicas by ALTER, OPTIMIZE or TRUNCATE queries.
Possible values:
0— Do not wait.1— Wait for own execution.2— Wait for everyone.3- Only wait for active replicas.
Cloud default value: 0.
alter_update_mode
Type
AlterUpdateMode
Default
heavy
Version history
| Version | Default value | Comment |
|---|---|---|
| 25.5 | heavy | A new setting |
A mode for ALTER queries that have the UPDATE commands.
Possible values:
heavy- run regular mutation.lightweight- run lightweight update if possible, run regular mutation otherwise.lightweight_force- run lightweight update if possible, throw otherwise.