MongoDB 集合计数返回 -1

Question

我有一个 MongoDB 集合，它在我调用 db.collection.count() 时返回 -1 ，但是如果我调用 db.collection.find()然后返回一份文件。

负数是否表明集合有问题？我在文档中找不到任何内容。

我尝试在集合中插入一个虚拟文档 - 这将计数更改为 2。删除此文档后，计数现在处于正确的 1 值，并且只存储了原始文档。

Answer 1

看来我错过了文档的这一部分:

After an unclean shutdown of a mongod using the Wired Tiger storage engine, count statistics reported by count() may be inaccurate.

The amount of drift depends on the number of insert, update, or delete operations performed between the last checkpoint and the unclean shutdown. Checkpoints usually occur every 60 seconds. However, mongod instances running with non-default --syncdelay settings may have more or less frequent checkpoints.

Run validate on each collection on the mongod to to restore the correct statistics after an unclean shutdown.

运行 db.unboundCollection.validate({full:true})解决了这个问题。