-`changed` ([UInt8](../../sql-reference/data-types/int-uint.md#uint-ranges)) — показывает, была ли настройка указана в `config.xml` или является значением по-умолчанию.
-`description` ([String](../../sql-reference/data-types/string.md)) — краткое описание настройки.
-`type` ([String](../../sql-reference/data-types/string.md)) — тип настройки.
**Пример**
Пример показывает как получить информацию о настройках, имена которых содержат `thread_pool`.
│ max_thread_pool_size │ 5000 │ 10000 │ 1 │ The maximum number of threads that could be allocated from the OS and used for query execution and background operations. │ UInt64 │
│ max_thread_pool_free_size │ 1000 │ 1000 │ 0 │ The maximum number of threads that will always stay in a global thread pool once allocated and remain idle in case of insufficient number of tasks. │ UInt64 │
│ thread_pool_queue_size │ 10000 │ 10000 │ 0 │ The maximum number of tasks that will be placed in a queue and wait for execution. │ UInt64 │
│ max_io_thread_pool_size │ 100 │ 100 │ 0 │ The maximum number of threads that would be used for IO operations │ UInt64 │
│ max_io_thread_pool_free_size │ 0 │ 0 │ 0 │ Max free size for IO thread pool. │ UInt64 │
│ io_thread_pool_queue_size │ 10000 │ 10000 │ 0 │ Queue size for IO thread pool. │ UInt64 │