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Merge pull request #58053 from ClickHouse/update_query_cache_doc

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Updating query cache doc with security consideration
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San 2023-12-20 13:50:08 +11:00 committed by GitHub
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docs/en/operations/query-cache.md
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@ -29,6 +29,10 @@ Transactionally inconsistent caching is traditionally provided by client tools o
the same caching logic and configuration is often duplicated. With ClickHouse's query cache, the caching logic moves to the server side.
This reduces maintenance effort and avoids redundancy.
:::security consideration
The cached query result is tied to the user executing it. Authorization checks are performed when the query is executed. This means that if there are any alterations to the user's role or permissions between the time the query is cached and when the cache is accessed, the result will not reflect these changes. We recommend using different users to distinguish between different levels of access, instead of actively toggling roles for a single user between queries, as this practice may lead to unexpected query results.
:::
## Configuration Settings and Usage
Setting [use_query_cache](settings/settings.md#use-query-cache) can be used to control whether a specific query or all queries of the