早上好。我有一些问题。我有这些领域:
name: "Mike",
city: "NY",
address: "something",
pets: ["dog", "cat"]
我创建了索引
db.person.ensureIndex({name: 1})
db.person.ensureIndex({city: 1})
db.person.ensureIndex({address: 1})
db.person.ensureIndex({pets: 1})
查询是
db.person.find({$and: [{$or: [{name: "Mike"}, {city: "CA"}]}, {pets: "dog"}]}).explain()
而且我没有得到 B_tree 查询……我得到了 BasicCursor……如何解决?