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Merge pull request #55171 from den-crane/patch-60

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Doc. update default value of ratio_of_defaults_for_sparse_serialization
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Alexey Milovidov 2023-09-30 00:23:23 +03:00 committed by GitHub
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docs/en/operations/settings/merge-tree-settings.md
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@ -746,14 +746,14 @@ Default value: `0` (limit never applied).
Minimal ratio of the number of _default_ values to the number of _all_ values in a column. Setting this value causes the column to be stored using sparse serializations. Minimal ratio of the number of _default_ values to the number of _all_ values in a column. Setting this value causes the column to be stored using sparse serializations.
If a column is sparse (contains mostly zeros), ClickHouse can encode it in a sparse format and automatically optimize calculations - the data does not require full decompression during queries. To enable this sparse serialization, define the `ratio_of_defaults_for_sparse_serialization` setting to be less than 1.0. If the value is greater than or equal to 1.0 (the default), then the columns will be always written using the normal full serialization. If a column is sparse (contains mostly zeros), ClickHouse can encode it in a sparse format and automatically optimize calculations - the data does not require full decompression during queries. To enable this sparse serialization, define the `ratio_of_defaults_for_sparse_serialization` setting to be less than 1.0. If the value is greater than or equal to 1.0, then the columns will be always written using the normal full serialization.
Possible values: Possible values:
- Float between 0 and 1 to enable sparse serialization - Float between 0 and 1 to enable sparse serialization
- 1.0 (or greater) if you do not want to use sparse serialization - 1.0 (or greater) if you do not want to use sparse serialization
Default value: `1.0` (sparse serialization is disabled) Default value: `0.9375`
**Example** **Example**