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1.4 KiB
1.4 KiB
slug | title |
---|---|
/en/operations/system-tables/merge_tree_settings | merge_tree_settings |
Contains information about settings for MergeTree
tables.
Columns:
name
(String) — Setting name.value
(String) — Setting value.description
(String) — Setting description.type
(String) — Setting type (implementation specific string value).changed
(UInt8) — Whether the setting was explicitly defined in the config or explicitly changed.
Example
SELECT * FROM system.merge_tree_settings LIMIT 4 FORMAT Vertical;
Row 1:
──────
name: index_granularity
value: 8192
changed: 0
description: How many rows correspond to one primary key value.
type: SettingUInt64
Row 2:
──────
name: min_bytes_for_wide_part
value: 0
changed: 0
description: Minimal uncompressed size in bytes to create part in wide format instead of compact
type: SettingUInt64
Row 3:
──────
name: min_rows_for_wide_part
value: 0
changed: 0
description: Minimal number of rows to create part in wide format instead of compact
type: SettingUInt64
Row 4:
──────
name: merge_max_block_size
value: 8192
changed: 0
description: How many rows in blocks should be formed for merge operations.
type: SettingUInt64
4 rows in set. Elapsed: 0.001 sec.