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support ttl in ms #2702

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merged 5 commits into from
Apr 23, 2023
Merged

support ttl in ms #2702

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c73444e
support ttl in ms
abby-cyber Apr 3, 2023
5232ba5
Update ttl-options.md
abby-cyber Apr 10, 2023
456f9bb
add caution after `ttl_use_ms` is set to `true`
abby-cyber Apr 10, 2023
fb08a9c
Update docs-2.0/3.ngql-guide/8.clauses-and-options/ttl-options.md
cooper-lzy Apr 12, 2023
10081dd
Update docs-2.0/3.ngql-guide/8.clauses-and-options/ttl-options.md
abby-cyber Apr 12, 2023
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7 changes: 6 additions & 1 deletion docs-2.0/3.ngql-guide/8.clauses-and-options/ttl-options.md
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Expand Up @@ -23,7 +23,12 @@ nGQL 支持的 TTL 选项如下。
|选项|说明|
|:---|:---|
|`ttl_col`|指定要设置存活时间的属性。属性的数据类型必须是`int`或者`timestamp`。|
|`ttl_duration`|指定时间戳差值，单位：秒。时间戳差值必须为 64 位非负整数。属性值和时间戳差值之和如果小于当前时间戳，属性就会过期。如果`ttl_duration`为`0`，属性永不过期。|
|`ttl_duration`|指定时间戳差值，默认单位：秒。时间戳差值必须为 64 位非负整数。属性值和时间戳差值之和如果小于当前时间戳，属性就会过期。如果`ttl_duration`为`0`，属性永不过期。<br/>可在配置文件`nebula-storaged.conf`（默认路径`/usr/local/nightly/etc/`）中设置`ttl_use_ms`为`true`将默认单位设为毫秒。|

!!! caution

- 在设置`ttl_use_ms`为`true`前，请确保没有为属性设置 TTL，否则会因为过期时间缩短，导致数据被错误地删除。
- 在设置`ttl_use_ms`为`true`后，即设置`ttl_duration`的默认单位为毫秒后，`ttl_col`的默认单位仍然为秒，它的数据类型必须是`int`，并且需要手动转换属性值为毫秒。例如设置`ttl_col`为`a`，则需要将`a`的值转换为毫秒，如当`a`的值为`now()`，则需要将`a`的值设置为`now() * 1000`。

## 属性过期

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