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Update ttl-options.md #685

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Jul 6, 2021
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Update ttl-options.md #685

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Update ttl-options.md
whitewum Jul 5, 2021
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6 changes: 5 additions & 1 deletion docs-2.0/3.ngql-guide/8.clauses-and-options/ttl-options.md
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Expand Up @@ -10,7 +10,11 @@ TTL（Time To Live）指定属性的存活时间，超时后，该属性就会

- 不能修改带有TTL选项的属性的Schema。

- Tag或Edge type上如果有索引，不能设置TTL选项，即使在没有索引的属性上设置也不行。
- TTL 和 INDEX 共存问题：

+ 如果已有 INDEX：不能再设置 TTL，即使在没有 INDEX 的属性上设置 TTL 也不行。

+ 如果已有 TTL：可以再添加 INDEX。

## 属性过期

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