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53 lines
1.5 KiB
Markdown
53 lines
1.5 KiB
Markdown
---
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slug: /zh/sql-reference/dictionaries/external-dictionaries/external-dicts-dict
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machine_translated: true
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machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
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sidebar_position: 40
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sidebar_label: "\u914D\u7F6E\u5916\u90E8\u5B57\u5178"
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---
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# 配置外部字典 {#dicts-external-dicts-dict}
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如果使用xml文件配置字典，则比字典配置具有以下结构:
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``` xml
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<dictionary>
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<name>dict_name</name>
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<structure>
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<!-- Complex key configuration -->
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</structure>
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<source>
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<!-- Source configuration -->
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</source>
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<layout>
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<!-- Memory layout configuration -->
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</layout>
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<lifetime>
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<!-- Lifetime of dictionary in memory -->
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</lifetime>
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</dictionary>
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```
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相应的 [DDL-查询](../../statements/create.md#create-dictionary-query) 具有以下结构:
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``` sql
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CREATE DICTIONARY dict_name
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(
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... -- attributes
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)
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PRIMARY KEY ... -- complex or single key configuration
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SOURCE(...) -- Source configuration
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LAYOUT(...) -- Memory layout configuration
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LIFETIME(...) -- Lifetime of dictionary in memory
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```
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- `name` – The identifier that can be used to access the dictionary. Use the characters `[a-zA-Z0-9_\-]`.
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- [来源](external-dicts-dict-sources.md) — Source of the dictionary.
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- [布局](external-dicts-dict-layout.md) — Dictionary layout in memory.
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- [结构](external-dicts-dict-structure.md) — Structure of the dictionary . A key and attributes that can be retrieved by this key.
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- [使用寿命](external-dicts-dict-lifetime.md) — Frequency of dictionary updates.
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