> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-parallel-read-in-order-multi-part.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> 包含有关服务器配置的警告信息，这些信息会在 clickhouse-client 连接到服务器后立即显示。

# system.warnings

## 说明

此表显示有关 ClickHouse 服务器的警告。
相同类型的警告会合并为一条警告。
例如，如果已挂载 (attached) 的数据库数量 N 超过可配置的阈值 T，则只显示一条包含当前值 N 的记录，而不是 N 条独立记录。
如果当前值降至阈值以下，该记录会从表中移除。

可通过以下设置配置此表：

* [max\_table\_num\_to\_warn](/zh/reference/settings/server-settings/settings/max-table#max_table_num_to_warn)
* [max\_database\_num\_to\_warn](/zh/reference/settings/server-settings/settings/max-database#max_database_num_to_warn)
* [max\_dictionary\_num\_to\_warn](/zh/reference/settings/server-settings/settings/max-dictionary#max_dictionary_num_to_warn)
* [max\_view\_num\_to\_warn](/zh/reference/settings/server-settings/settings/max-view#max_view_num_to_warn)
* [max\_part\_num\_to\_warn](/zh/reference/settings/server-settings/settings/max#max_part_num_to_warn)
* [max\_pending\_mutations\_to\_warn](/zh/reference/settings/server-settings/settings/max-pending#max_pending_mutations_to_warn)
* [max\_pending\_mutations\_execution\_time\_to\_warn](/zh/reference/settings/server-settings/settings/max-pending#max_pending_mutations_execution_time_to_warn)
* [max\_named\_collection\_num\_to\_warn](/zh/reference/settings/server-settings/settings/max-named#max_named_collection_num_to_warn)
* [resource\_overload\_warnings](/zh/concepts/features/configuration/settings/server-overload#resource-overload-warnings)

## 列

* `message` ([String](/zh/reference/data-types/string)) — 由 ClickHouse 服务器 发出的警告消息。
* `message_format_string` ([LowCardinality(String)](/zh/reference/data-types/lowcardinality)) — 用于格式化该消息的格式字符串。

## 示例

```sql title="Query" theme={null}
 SELECT * FROM system.warnings LIMIT 2 \G;
```

```text title="Response" theme={null}
Row 1:
──────
message:               The number of active parts is more than 10.
message_format_string: The number of active parts is more than {}.

Row 2:
──────
message:               The number of attached databases is more than 2.
message_format_string: The number of attached databases is more than {}.
```