DOCS-323: LowCardinality #14772
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DOCS-323: LowCardinality #14772
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robot-clickhouse
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den-crane
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Sep 13, 2020
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| ## low\_cardinality\_use\_single\_dictionary\_for\_part {#low_cardinality_use_single_dictionary_for_part} | ||
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| Включает или выключает использование единого словаря для частей данных. |
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Включает или выключает использование единого словаря для куска (парта).
| @@ -1616,6 +1616,63 @@ SELECT idx, i FROM null_in WHERE i IN (1, NULL) SETTINGS transform_null_in = 1; | |||
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| - [Обработка значения NULL в операторе IN](../../sql-reference/operators/in.md#in-null-processing) | |||
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| ## low\_cardinality\_max\_dictionary\_size {#low_cardinality_max_dictionary_size} | |||
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| Задает максимальную длину строк в общем глобальном словаре для типа данных `LowCardinality`, который может быть записан в файловую систему хранилища. Настройка предоствращает проблемы с оперативной памятью в случае неограниченного увеличения словаря. Все данные, которые не могут быть закодированы из-за ограничения максимального размера словаря, ClickHouse записывает обычным способом. | |||
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Задает максимальный размер общего глобального словаря (в строках) для типа данных LowCardinality, который может быть записан в файловую систему хранилища. Настройка предотвращает проблемы с оперативной памятью в случае неограниченного увеличения словаря. Все данные, которые не могут быть закодированы из-за ограничения максимального размера словаря, ClickHouse записывает обычным способом.
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Тоже отредактировала
alexey-milovidov
approved these changes
Sep 20, 2020
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