ClickHouse/docs/zh/sql-reference/dictionaries/external-dictionaries/external-dicts-dict.md

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# 配置外部字典 {#dicts-external-dicts-dict}
如果使用xml文件配置字典则比字典配置具有以下结构:
``` xml
<dictionary>
<name>dict_name</name>
<structure>
<!-- Complex key configuration -->
</structure>
<source>
<!-- Source configuration -->
</source>
<layout>
<!-- Memory layout configuration -->
</layout>
<lifetime>
<!-- Lifetime of dictionary in memory -->
</lifetime>
</dictionary>
```
相应的 [DDL-查询](../../statements/create.md#create-dictionary-query) 具有以下结构:
``` sql
CREATE DICTIONARY dict_name
(
... -- attributes
)
PRIMARY KEY ... -- complex or single key configuration
SOURCE(...) -- Source configuration
LAYOUT(...) -- Memory layout configuration
LIFETIME(...) -- Lifetime of dictionary in memory
```
- `name` The identifier that can be used to access the dictionary. Use the characters `[a-zA-Z0-9_\-]`.
- [来源](external-dicts-dict-sources.md) — Source of the dictionary.
- [布局](external-dicts-dict-layout.md) — Dictionary layout in memory.
- [结构](external-dicts-dict-structure.md) — Structure of the dictionary . A key and attributes that can be retrieved by this key.
- [使用寿命](external-dicts-dict-lifetime.md) — Frequency of dictionary updates.
[原始文章](https://clickhouse.com/docs/en/query_language/dicts/external_dicts_dict/) <!--hide-->