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Copy file name to clipboardExpand all lines: docs/en/operations/storing-data.md
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:::tip
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A [demo dataset](https://github.com/ClickHouse/web-tables-demo) is hosted in GitHub. To prepare your own tables for web storage see the tool [clickhouse-static-files-uploader](/operations/storing-data.md/#storing-data-on-webserver)
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A [demo dataset](https://github.com/ClickHouse/web-tables-demo) is hosted in GitHub. To prepare your own tables for web storage see the tool [clickhouse-static-files-uploader](/operations/utilities/static-files-disk-uploader)
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In this `ATTACH TABLE` query the `UUID` provided matches the directory name of the data, and the endpoint is the URL for the raw GitHub content.
Copy file name to clipboardExpand all lines: docs/en/operations/system-tables/asynchronous_insert_log.md
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To start logging configure parameters in the [asynchronous_insert_log](../../operations/server-configuration-parameters/settings.md#asynchronous_insert_log) section.
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The flushing period of data is set in `flush_interval_milliseconds` parameter of the [asynchronous_insert_log](../../operations/server-configuration-parameters/settings.md#asynchronous_insert_log) server settings section. To force flushing, use the [SYSTEM FLUSH LOGS](/sql-reference/statements/system#query_language-system-flush_logs) query.
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The flushing period of data is set in `flush_interval_milliseconds` parameter of the [asynchronous_insert_log](../../operations/server-configuration-parameters/settings.md#asynchronous_insert_log) server settings section. To force flushing, use the [SYSTEM FLUSH LOGS](/sql-reference/statements/system#flush-logs) query.
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ClickHouse does not delete data from the table automatically. See [Introduction](/operations/system-tables/overview#system-tables-introduction) for more details.
Copy file name to clipboardExpand all lines: docs/en/operations/system-tables/dictionaries.md
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-`key.names` ([Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md))) — Array of [key names](/operations/system-tables/dictionaries) provided by the dictionary.
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-`key.types` ([Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md))) — Corresponding array of [key types](/sql-reference/dictionaries#dictionary-key-and-fields) provided by the dictionary.
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-`attribute.names` ([Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md))) — Array of [attribute names](/sql-reference/dictionaries#dictionary-key-and-fields) provided by the dictionary.
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-`attribute.types` ([Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md))) — Corresponding array of [attribute types](../../sql-reference/dictionaries/index.md#dictionary-key-and-fields#ext_dict_structure-attributes) provided by the dictionary.
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-`attribute.types` ([Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md))) — Corresponding array of [attribute types](/sql-reference/dictionaries#attributes) provided by the dictionary.
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-`bytes_allocated` ([UInt64](/sql-reference/data-types/int-uint#integer-ranges)) — Amount of RAM allocated for the dictionary.
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-`query_count` ([UInt64](/sql-reference/data-types/int-uint#integer-ranges)) — Number of queries since the dictionary was loaded or since the last successful reboot.
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-`hit_rate` ([Float64](../../sql-reference/data-types/float.md)) — For cache dictionaries, the percentage of uses for which the value was in the cache.
Copy file name to clipboardExpand all lines: docs/en/operations/system-tables/query_log.md
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You can change settings of queries logging in the [query_log](../../operations/server-configuration-parameters/settings.md#query-log) section of the server configuration.
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You can disable queries logging by setting [log_queries = 0](/sql-reference/functions/hash-functions#siphash128/operations/settings/settings#log_queries). We do not recommend to turn off logging because information in this table is important for solving issues.
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You can disable queries logging by setting [log_queries = 0](/operations/settings/settings#log_queries). We do not recommend to turn off logging because information in this table is important for solving issues.
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The flushing period of data is set in `flush_interval_milliseconds` parameter of the [query_log](../../operations/server-configuration-parameters/settings.md#query-log) server settings section. To force flushing, use the [SYSTEM FLUSH LOGS](/sql-reference/statements/system#flush-logs) query.
Copy file name to clipboardExpand all lines: docs/en/sql-reference/aggregate-functions/combinators.md
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## -State {#-state}
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If you apply this combinator, the aggregate function does not return the resulting value (such as the number of unique values for the [uniq](../../sql-reference/aggregate-functions/reference/uniq.md#agg_function-uniq) function), but an intermediate state of the aggregation (for `uniq`, this is the hash table for calculating the number of unique values). This is an `AggregateFunction(...)` that can be used for further processing or stored in a table to finish aggregating later.
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If you apply this combinator, the aggregate function does not return the resulting value (such as the number of unique values for the [uniq](/sql-reference/aggregate-functions/reference/uniq) function), but an intermediate state of the aggregation (for `uniq`, this is the hash table for calculating the number of unique values). This is an `AggregateFunction(...)` that can be used for further processing or stored in a table to finish aggregating later.
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:::note
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Please notice, that -MapState is not an invariant for the same data due to the fact that order of data in intermediate state can change, though it doesn't impact ingestion of this data.
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Let's get the names of the people whose age lies in the intervals of `[30,60)` and `[60,75)`. Since we use integer representation for age, we get ages in the `[30, 59]` and `[60,74]` intervals.
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To aggregate names in an array, we use the [groupArray](../../sql-reference/aggregate-functions/reference/grouparray.md#agg_function-grouparray) aggregate function. It takes one argument. In our case, it's the `name` column. The `groupArrayResample` function should use the `age` column to aggregate names by age. To define the required intervals, we pass the `30, 75, 30` arguments into the `groupArrayResample` function.
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To aggregate names in an array, we use the [groupArray](/sql-reference/aggregate-functions/reference/grouparray) aggregate function. It takes one argument. In our case, it's the `name` column. The `groupArrayResample` function should use the `age` column to aggregate names by age. To define the required intervals, we pass the `30, 75, 30` arguments into the `groupArrayResample` function.
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```sql
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SELECT groupArrayResample(30, 75, 30)(name, age) FROM people
Copy file name to clipboardExpand all lines: docs/en/sql-reference/aggregate-functions/index.md
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ClickHouse also supports:
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-[Parametric aggregate functions](../../sql-reference/aggregate-functions/parametric-functions.md#aggregate_functions_parametric), which accept other parameters in addition to columns.
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-[Combinators](../../sql-reference/aggregate-functions/combinators.md#aggregate_functions_combinators), which change the behavior of aggregate functions.
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-[Parametric aggregate functions](/sql-reference/aggregate-functions/parametric-functions), which accept other parameters in addition to columns.
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-[Combinators](/sql-reference/aggregate-functions/combinators), which change the behavior of aggregate functions.
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