【MongoDB学习笔记22】MongoDB的索引管理
> db.users.ensureIndex({"username":1},{"name":"firstname"}){
"createdCollectionAutomatically" : false,
"numIndexesBefore" : 2,
"numIndexesAfter" : 3,
"ok" : 1
}
> db.users.getIndexes()
[
{
"v" : 1,
"key" : {
"_id" : 1
},
"name" : "_id_",
"ns" : "blog.users"
},
{
"v" : 1,
"key" : {
"age" : 1,
"username" : 1
},
"name" : "age_1_username_1",
"ns" : "blog.users"
},
{
"v" : 1,
"key" : {
"username" : 1
},
"name" : "firstname",
"ns" : "blog.users"
}
]
>
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