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76 lines
2.6 KiB
Markdown
76 lines
2.6 KiB
Markdown
---
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machine_translated: true
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machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
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toc_priority: 62
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toc_title: "Restricciones en la configuraci\xF3n"
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---
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# Restricciones en la configuración {#constraints-on-settings}
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Las restricciones en los ajustes se pueden definir en el `profiles` sección de la `user.xml` el archivo de configuración y prohíba a los usuarios cambiar algunos de los ajustes `SET` consulta.
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Las restricciones se definen como las siguientes:
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``` xml
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<profiles>
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<user_name>
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<constraints>
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<setting_name_1>
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<min>lower_boundary</min>
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</setting_name_1>
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<setting_name_2>
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<max>upper_boundary</max>
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</setting_name_2>
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<setting_name_3>
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<min>lower_boundary</min>
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<max>upper_boundary</max>
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</setting_name_3>
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<setting_name_4>
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<readonly/>
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</setting_name_4>
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</constraints>
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</user_name>
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</profiles>
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```
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Si el usuario intenta violar las restricciones, se lanza una excepción y la configuración no se cambia.
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Se admiten tres tipos de restricciones: `min`, `max`, `readonly`. El `min` y `max` Las restricciones especifican los límites superior e inferior para una configuración numérica y se pueden usar en combinación. El `readonly` constraint especifica que el usuario no puede cambiar la configuración correspondiente en absoluto.
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**Ejemplo:** Dejar `users.xml` incluye líneas:
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``` xml
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<profiles>
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<default>
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<max_memory_usage>10000000000</max_memory_usage>
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<force_index_by_date>0</force_index_by_date>
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...
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<constraints>
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<max_memory_usage>
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<min>5000000000</min>
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<max>20000000000</max>
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</max_memory_usage>
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<force_index_by_date>
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<readonly/>
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</force_index_by_date>
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</constraints>
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</default>
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</profiles>
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```
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Las siguientes consultas arrojan excepciones:
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``` sql
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SET max_memory_usage=20000000001;
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SET max_memory_usage=4999999999;
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SET force_index_by_date=1;
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```
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``` text
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Code: 452, e.displayText() = DB::Exception: Setting max_memory_usage should not be greater than 20000000000.
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Code: 452, e.displayText() = DB::Exception: Setting max_memory_usage should not be less than 5000000000.
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Code: 452, e.displayText() = DB::Exception: Setting force_index_by_date should not be changed.
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```
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**Nota:** el `default` perfil tiene un manejo especial: todas las restricciones definidas para el `default` profile se convierten en las restricciones predeterminadas, por lo que restringen a todos los usuarios hasta que se anulan explícitamente para estos usuarios.
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[Artículo Original](https://clickhouse.tech/docs/en/operations/settings/constraints_on_settings/) <!--hide-->
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