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DOCSUP-1380 Document the max_server_memory_usage_to_ram_ratio setting (#142)

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* Docs in en for max_server_memory_usage_to_ram_ratio setting added, for max_server_memory_usage setting slightly updated.

* Apply suggestions from code review

Co-authored-by: BayoNet <da-daos@yandex.ru>

* Translated to Russian.

Co-authored-by: Olga Revyakina <revolg@yandex-team.ru>
Co-authored-by: BayoNet <da-daos@yandex.ru>
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29
docs/en/operations/server-configuration-parameters/settings.md
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@ -397,7 +397,6 @@ The cache is shared for the server and memory is allocated as needed. The cache
``` xml
<mark_cache_size>5368709120</mark_cache_size>
```
## max\_server\_memory\_usage {#max_server_memory_usage}
Limits total RAM usage by the ClickHouse server. You can specify it only for the default profile.
@ -411,11 +410,37 @@ Default value: `0`.
**Additional Info**
On hosts with low RAM and swap, you possibly need setting `max_server_memory_usage_to_ram_ratio > 1`.
The default `max_server_memory_usage` value is calculated as `memory_amount * max_server_memory_usage_to_ram_ratio`.
**See also**
- [max\_memory\_usage](../../operations/settings/query-complexity.md#settings_max_memory_usage)
- [max_server_memory_usage_to_ram_ratio](#max_server_memory_usage_to_ram_ratio)
## max_server_memory_usage_to_ram_ratio {#max_server_memory_usage_to_ram_ratio}
Defines the fraction of total physical RAM amount, available to the Clickhouse server. If the server tries to utilize more, the memory is cut down to the appropriate amount.
Possible values:
- Positive double.
- 0 — The Clickhouse server can use all available RAM.
Default value: `0`.
**Usage**
On hosts with low RAM and swap, you possibly need setting `max_server_memory_usage_to_ram_ratio` larger than 1.
**Example**
``` xml
<max_server_memory_usage_to_ram_ratio>0.9</max_server_memory_usage_to_ram_ratio>
```
**See Also**
- [max_server_memory_usage](#max_server_memory_usage)
## max\_concurrent\_queries {#max-concurrent-queries}

27
docs/ru/operations/server-configuration-parameters/settings.md
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@ -385,12 +385,37 @@ ClickHouse проверит условия `min_part_size` и `min_part_size_rat
**Дополнительная информация**
На серверах с небольшим объёмом RAM и файла подкачки может потребоваться настройка `max_server_memory_usage_to_ram_ratio > 1`.
Значение по умолчанию для `max_server_memory_usage` рассчитывается как `memory_amount * max_server_memory_usage_to_ram_ratio`.
**См. также**
- [max_memory_usage](../settings/query-complexity.md#settings_max_memory_usage)
## max_server_memory_usage_to_ram_ratio {#max_server_memory_usage_to_ram_ratio}
Определяет долю оперативной памяти, доступную для использования сервером Clickhouse. Если сервер попытается использовать больше, предоставляемый ему объём памяти будет ограничен до расчётного значения.
Возможные значения:
- Положительное число с плавающей запятой.
- 0 — сервер Clickhouse может использовать всю оперативную память.
Значение по умолчанию: `0`.
**Использование**
На серверах с небольшим объёмом оперативной памяти и файла подкачки может потребоваться установить настройку `max_server_memory_usage_to_ram_ratio` в значение, большее 1.
**Пример**
``` xml
<max_server_memory_usage_to_ram_ratio>0.9</max_server_memory_usage_to_ram_ratio>
```
**См. также**
- [max_server_memory_usage](#max_server_memory_usage)
## max\_connections {#max-connections}
Максимальное количество входящих соединений.