如何在 MongoDB 中创建长时间戳的 TTL 索引
在我的 mongo 数据库中,我有字段时间戳,它在时间戳中保存创建时间,即:"timestamp": 1544029233021
我想在此字段上创建 TTL 索引,但在文档中的示例是在 "createdAt": new Date(),
上完成的,即 ISODate("2018-12-13T17:00:10.433Z")
In my mongo database I have field timestamp which holds time of creation in timestamp ie: "timestamp": 1544029233021
I want to create TTL index on this field, but in docs example is done on "createdAt": new Date(),
which is ISODate("2018-12-13T17:00:10.433Z")
是否有可能以任何方式使 TTL 索引在时间戳字段上工作?
Is it possible to in any way to make TTL Index work on timestamp field?
因为这不起作用:
db.coll.createIndex( { "timestamp": 1 }, { expireAfterSeconds: 3600 } )
推荐答案
文档没有过期,因为 timestamp
值是一个整数.
The documents aren't being expired because the timestamp
value is an integer.
TTL 索引仅适用于索引字段为日期或包含日期数组的文档:
TTL indexes will only work on documents where the indexed field is a Date or holds an array of Dates:
如果文档中的索引字段不是日期或数组保存日期值,文档不会过期.
If the indexed field in a document is not a date or an array that holds a date value(s), the document will not expire.
(https://docs.mongodb.com/手册/核心/index-ttl/#expiration-of-data)
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