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Documenting MergeTree's cache_populated_by_fetch setting.

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kellytoole 2024-11-18 16:34:14 -08:00
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docs/en/operations/settings/merge-tree-settings.md
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@ -1095,3 +1095,13 @@ Possible values:
Default value: 0.0 Default value: 0.0
Note that if both `min_free_disk_ratio_to_perform_insert` and `min_free_disk_bytes_to_perform_insert` are specified, ClickHouse will count on the value that will allow to perform inserts on a bigger amount of free memory. Note that if both `min_free_disk_ratio_to_perform_insert` and `min_free_disk_bytes_to_perform_insert` are specified, ClickHouse will count on the value that will allow to perform inserts on a bigger amount of free memory.
## cache_populated_by_fetch
A Cloud only setting.
When `cache_populated_by_fetch` is disabled (the default setting), new data parts are loaded into the cache only when a query is run that requires those parts.
If enabled, `cache_populated_by_fetch` will instead cause all nodes to load new data parts from storage into their cache without requiring a query to trigger such an action.
Default value: 0.