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Merge pull request #8707 from TCeason/ISSUE-8706
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fix(query): max_threads can not determined automatically
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@BohuTANG
BohuTANG authored Nov 9, 2022
2 parents 8866cce + cd3111b commit aee9cba
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60 changes: 33 additions & 27 deletions docs/doc/30-reference/30-sql/40-show/show-settings.md
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Expand Up @@ -16,32 +16,38 @@ SHOW SETTINGS

```sql
SHOW SETTINGS;
+--------------------------------+------------+------------+---------+----------------------------------------------------------------------------------------------------+--------+
| name | value | default | level | description | type |
+--------------------------------+------------+------------+---------+----------------------------------------------------------------------------------------------------+--------+
| enable_async_insert | 0 | 0 | SESSION | Whether the client open async insert mode, default value: 0 | UInt64 |
| enable_cbo | 1 | 1 | SESSION | If enable cost based optimization, default value: 1 | UInt64 |
| enable_new_processor_framework | 1 | 1 | SESSION | Enable new processor framework if value != 0, default value: 1 | UInt64 |
| enable_planner_v2 | 1 | 1 | SESSION | Enable planner v2 by setting this variable to 1, default value: 1 | UInt64 |
| flight_client_timeout | 60 | 60 | SESSION | Max duration the flight client request is allowed to take in seconds. By default, it is 60 seconds | UInt64 |
| format_compression | None | None | SESSION | Format compression, default value: None | String |
| format_empty_as_default | 1 | 1 | SESSION | Format empty_as_default, default value: 1 | UInt64 |
| format_field_delimiter | , | , | SESSION | Format field delimiter, default value: , | String |
| format_quote_char | '"' | '"' | SESSION | The quote char for CSV. default value: '"'. | String |
| format_record_delimiter | "\n" | "\n" | SESSION | Format record_delimiter, default value: "\n" | String |
| format_skip_header | 0 | 0 | SESSION | Whether to skip the input header, default value: 0 | UInt64 |
| group_by_two_level_threshold | 10000 | 10000 | SESSION | The threshold of keys to open two-level aggregation, default value: 10000 | UInt64 |
| input_read_buffer_size | 1048576 | 1048576 | SESSION | The size of buffer in bytes for input with format. By default, it is 1MB. | UInt64 |
| max_block_size | 65536 | 65536 | SESSION | Maximum block size for reading | UInt64 |
| max_execute_time | 0 | 0 | SESSION | The maximum query execution time. it means no limit if the value is zero. default value: 0 | UInt64 |
| max_threads | 10 | 16 | SESSION | The maximum number of threads to execute the request. By default, it is determined automatically. | UInt64 |
| quoted_ident_case_sensitive | 1 | 1 | SESSION | Case sensitivity of quoted identifiers, default value: 1 (aka case-sensitive) | UInt64 |
| sql_dialect | PostgreSQL | PostgreSQL | SESSION | SQL dialect, support "PostgreSQL" "MySQL" and "Hive", default value: "PostgreSQL" | String |
| storage_read_buffer_size | 1048576 | 1048576 | SESSION | The size of buffer in bytes for buffered reader of dal. By default, it is 1MB. | UInt64 |
| timezone | UTC | UTC | SESSION | Timezone, default value: UTC, | String |
| unquoted_ident_case_sensitive | 0 | 0 | SESSION | Case sensitivity of unquoted identifiers, default value: 0 (aka case-insensitive) | UInt64 |
| wait_for_async_insert | 1 | 1 | SESSION | Whether the client wait for the reply of async insert, default value: 1 | UInt64 |
| wait_for_async_insert_timeout | 100 | 100 | SESSION | The timeout in seconds for waiting for processing of async insert, default value: 100 | UInt64 |
+--------------------------------+------------+------------+---------+----------------------------------------------------------------------------------------------------+--------+
+--------------------------------+------------+------------+---------+--------------------------------------------------------------------------------------------------------------------+--------+
| name | value | default | level | description | type |
+--------------------------------+------------+------------+---------+--------------------------------------------------------------------------------------------------------------------+--------+
| collation | binary | binary | SESSION | Char collation, support "binary" "utf8" default value: binary | String |
| enable_async_insert | 0 | 0 | SESSION | Whether the client open async insert mode, default value: 0. | UInt64 |
| enable_cbo | 1 | 1 | SESSION | If enable cost based optimization, default value: 1. | UInt64 |
| enable_distributed_eval_index | 1 | 1 | SESSION | If enable distributed eval index, default value: 1 | UInt64 |
| enable_new_processor_framework | 1 | 1 | SESSION | Enable new processor framework if value != 0, default value: 1. | UInt64 |
| enable_planner_v2 | 1 | 1 | SESSION | Enable planner v2 by setting this variable to 1, default value: 1. | UInt64 |
| flight_client_timeout | 60 | 60 | SESSION | Max duration the flight client request is allowed to take in seconds. By default, it is 60 seconds. | UInt64 |
| format_compression | None | None | SESSION | Format compression, default value: "None". | String |
| format_empty_as_default | 1 | 1 | SESSION | Format empty_as_default, default value: 1. | UInt64 |
| format_escape | | | SESSION | format escape char, default value: "", which means the format`s default setting. | String |
| format_field_delimiter | | | SESSION | Format field delimiter, default value is "": use default of the format. | String |
| format_quote | | | SESSION | The quote char for format. default value is "": use default of the format. | String |
| format_record_delimiter | | | SESSION | Format record_delimiter, default value is "": use default of the format. | String |
| format_skip_header | 0 | 0 | SESSION | Whether to skip the input header, default value: 0. | UInt64 |
| group_by_two_level_threshold | 10000 | 10000 | SESSION | The threshold of keys to open two-level aggregation, default value: 10000. | UInt64 |
| input_read_buffer_size | 1048576 | 1048576 | SESSION | The size of buffer in bytes for input with format. By default, it is 1MB. | UInt64 |
| max_block_size | 65536 | 65536 | SESSION | Maximum block size for reading, default value: 65536. | UInt64 |
| max_execute_time | 0 | 0 | SESSION | The maximum query execution time. it means no limit if the value is zero. default value: 0. | UInt64 |
| max_storage_io_requests | 1000 | 1000 | SESSION | The maximum number of concurrent IO requests. By default, it is 1000. | UInt64 |
| max_threads | 24 | 0 | SESSION | The maximum number of threads to execute the request. By default the value is 0 it means determined automatically. | UInt64 |
| quoted_ident_case_sensitive | 1 | 1 | SESSION | Case sensitivity of quoted identifiers, default value: 1 (aka case-sensitive). | UInt64 |
| row_tag | row | row | SESSION | In xml format, this field is represented as a row tag, e.g. <row>...</row>. | String |
| sql_dialect | PostgreSQL | PostgreSQL | SESSION | SQL dialect, support "PostgreSQL" "MySQL" and "Hive", default value: "PostgreSQL". | String |
| storage_read_buffer_size | 1048576 | 1048576 | SESSION | The size of buffer in bytes for buffered reader of dal. By default, it is 1MB. | UInt64 |
| timezone | UTC | UTC | SESSION | Timezone, default value: "UTC". | String |
| unquoted_ident_case_sensitive | 0 | 0 | SESSION | Case sensitivity of unquoted identifiers, default value: 0 (aka case-insensitive). | UInt64 |
| wait_for_async_insert | 1 | 1 | SESSION | Whether the client wait for the reply of async insert, default value: 1. | UInt64 |
| wait_for_async_insert_timeout | 100 | 100 | SESSION | The timeout in seconds for waiting for processing of async insert, default value: 100. | UInt64 |
+--------------------------------+------------+------------+---------+--------------------------------------------------------------------------------------------------------------------+--------+
```
2 changes: 1 addition & 1 deletion docs/doc/30-reference/30-sql/70-system-tables/system-settings.md
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Expand Up @@ -91,7 +91,7 @@ set max_block_size = 65536;

## max_threads

The maximum number of threads to execute the request. By default, it is determined automatically. The value usually the same as the number of logical cpus.
The maximum number of threads to execute the request. By default the value is 0 it means determined automatically. The value usually the same as the number of logical cpus.

Examples:

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