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[Edit this page](https://github.com/ClickHouse/ClickHouse/tree/master/docs/en/operations/settings/index.md)

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| Page Description|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [Settings Overview](/docs/operations/settings/overview) Overview page for settings.|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [Permissions for queries](/docs/operations/settings/permissions-for-queries) Settings for query permissions.|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [Restrictions on query complexity](/docs/operations/settings/query-complexity) Settings which restrict query complexity.|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [Settings profiles](/docs/operations/settings/settings-profiles) A collection of settings grouped under the same name.|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [Constraints on settings](/docs/operations/settings/constraints-on-settings) Constraints on settings can be defined in the `profiles` section of the `user.xml` configuration file and prohibit users from changing some of the settings with the `SET` query.| [Users and roles settings](/docs/operations/settings/settings-users) Settings for configuring users and roles.|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [Composable protocols](/docs/operations/settings/composable-protocols) Composable protocols allows more flexible configuration of TCP access to the ClickHouse server.|  |  |  |  |  |  |  |  |  |  |  |  |  |  | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [Format Settings](/docs/operations/settings/formats) Settings which control input and output formats.|  |  |  |  |  |  |  |  |  |  |  |  | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [Memory overcommit](/docs/operations/settings/memory-overcommit) An experimental technique intended to allow to set more flexible memory limits for queries.|  |  |  |  |  |  |  |  |  |  | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [MergeTree tables settings](/docs/operations/settings/merge-tree-settings) Settings for MergeTree which are in `system.merge_tree_settings`| [Query-level Session Settings](/docs/operations/settings/query-level) Settings at the query-level|  |  |  |  |  |  | | --- | --- | --- | --- | --- | --- | | [Server overload](/docs/operations/settings/server-overload) Controlling behavior on server CPU overload.|  |  |  |  | | --- | --- | --- | --- | | [Session Settings](/docs/operations/settings/settings) Settings which are found in the `system.settings` table.| [TCP connection limits](/docs/operations/settings/tcp-connection-limits) TCP connection limits. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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