mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 19:02:04 +00:00
39 lines
1.4 KiB
Markdown
39 lines
1.4 KiB
Markdown
|
---
|
||
|
|
slug: /ja/operations/system-tables/dns_cache
|
||
|
|
---
|
||
|
|
# dns_cache
|
||
|
|
|
||
|
|
キャッシュされたDNSレコードに関する情報を含みます。
|
||
|
|
|
||
|
|
カラム:
|
||
|
|
|
||
|
|
- `hostname` ([String](../../sql-reference/data-types/string.md)) — キャッシュされたホスト名
|
||
|
|
- `ip_address` ([String](../../sql-reference/data-types/string.md)) — ホスト名に対応するIPアドレス
|
||
|
|
- `ip_family` ([Enum](../../sql-reference/data-types/enum.md)) — IPアドレスのファミリー、可能な値:
|
||
|
|
- 'IPv4'
|
||
|
|
- 'IPv6'
|
||
|
|
- 'UNIX_LOCAL'
|
||
|
|
- `cached_at` ([DateTime](../../sql-reference/data-types/datetime.md)) - レコードがキャッシュされた日時
|
||
|
|
|
||
|
|
**例**
|
||
|
|
|
||
|
|
クエリ:
|
||
|
|
|
||
|
|
```sql
|
||
|
|
SELECT * FROM system.dns_cache;
|
||
|
|
```
|
||
|
|
|
||
|
|
結果:
|
||
|
|
|
||
|
|
| hostname | ip\_address | ip\_family | cached\_at |
|
||
|
|
| :--- | :--- | :--- | :--- |
|
||
|
|
| localhost | ::1 | IPv6 | 2024-02-11 17:04:40 |
|
||
|
|
| localhost | 127.0.0.1 | IPv4 | 2024-02-11 17:04:40 |
|
||
|
|
|
||
|
|
**関連項目**
|
||
|
|
|
||
|
|
- [disable_internal_dns_cache 設定](../../operations/server-configuration-parameters/settings.md#disable_internal_dns_cache)
|
||
|
|
- [dns_cache_max_entries 設定](../../operations/server-configuration-parameters/settings.md#dns_cache_max_entries)
|
||
|
|
- [dns_cache_update_period 設定](../../operations/server-configuration-parameters/settings.md#dns_cache_update_period)
|
||
|
|
- [dns_max_consecutive_failures 設定](../../operations/server-configuration-parameters/settings.md#dns_max_consecutive_failures)
|