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# Server configuration parameters {#server-settings}
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This section contains descriptions of server settings that cannot be changed at the session or query level.
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These settings are stored in the `config.xml` file on the ClickHouse server.
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Other settings are described in the “[Settings](../settings/index.md#settings)” section.
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Before studying the settings, read the [Configuration files ](../configuration_files.md#configuration_files ) section and note the use of substitutions (the `incl` and `optional` attributes).
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[Original article ](https://clickhouse.tech/docs/en/operations/server_settings/ ) <!--hide-->