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61 lines
2.4 KiB
Markdown
61 lines
2.4 KiB
Markdown
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# Settings profiles
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A settings profile is a collection of settings grouped under the same name. Each ClickHouse user has a profile.
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To apply all the settings in a profile, set 'profile'. Example:
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```sql
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SET profile = 'web'
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```
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- Load the 'web' profile. In other words, set all the options that belong to the 'web' profile.
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Settings profiles are declared in the user config file. This is usually `users.xml`.
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Example:
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```xml
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<!-- Профили настроек. -->
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<profiles>
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<!-- Default settings -->
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<default>
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<!-- The maximum number of threads when running a single query. -->
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<max_threads>8</max_threads>
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</default>
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<!-- Настройки для запросов из пользовательского интерфейса -->
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<web>
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<max_rows_to_read>1000000000</max_rows_to_read>
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<max_bytes_to_read>100000000000</max_bytes_to_read>
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<max_rows_to_group_by>1000000</max_rows_to_group_by>
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<group_by_overflow_mode>any</group_by_overflow_mode>
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<max_rows_to_sort>1000000</max_rows_to_sort>
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<max_bytes_to_sort>1000000000</max_bytes_to_sort>
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<max_result_rows>100000</max_result_rows>
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<max_result_bytes>100000000</max_result_bytes>
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<result_overflow_mode>break</result_overflow_mode>
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<max_execution_time>600</max_execution_time>
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<min_execution_speed>1000000</min_execution_speed>
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<timeout_before_checking_execution_speed>15</timeout_before_checking_execution_speed>
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<max_columns_to_read>25</max_columns_to_read>
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<max_temporary_columns>100</max_temporary_columns>
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<max_temporary_non_const_columns>50</max_temporary_non_const_columns>
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<max_subquery_depth>2</max_subquery_depth>
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<max_pipeline_depth>25</max_pipeline_depth>
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<max_ast_depth>50</max_ast_depth>
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<max_ast_elements>100</max_ast_elements>
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<readonly>1</readonly>
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</web>
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</profiles>
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```
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The example specifies two profiles: `default` and `web`. The `default` profile has a special purpose: it must always be present and is applied when starting the server. In other words, the 'default' profile contains default settings. The 'web' profile is a regular profile that can be set using the SET query or using a URL parameter in an HTTP query.
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Settings profiles can inherit from each other. To use inheritance, indicate the 'profile' setting before the other settings that are listed in the profile.
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