ClickHouse/docs/en/dicts/external_dicts_dict.md
2018-04-23 09:20:21 +03:00

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<a name="dicts-external_dicts_dict"></a>
# Configuring an external dictionary
The dictionary configuration has the following structure:
```xml
<dictionary>
<name>dict_name</name>
<source>
<!-- Source configuration -->
</source>
<layout>
<!-- Memory layout configuration -->
</layout>
<structure>
<!-- Complex key configuration -->
</structure>
<lifetime>
<!-- Lifetime of dictionary in memory -->
</lifetime>
</dictionary>
```
- name The identifier that can be used to access the dictionary. Use the characters `[a-zA-Z0-9_\-]`.
- [source](external_dicts_dict_sources.md#dicts-external_dicts_dict_sources) — Source of the dictionary.
- [layout](external_dicts_dict_layout.md#dicts-external_dicts_dict_layout) — Dictionary layout in memory.
- [structure](external_dicts_dict_structure.md#dicts-external_dicts_dict_structure) — Structure of the dictionary . A key and attributes that can be retrieved by this key.
- [lifetime](external_dicts_dict_lifetime.md#dicts-external_dicts_dict_lifetime) — Frequency of dictionary updates.