在MongoDB中一次构建多个索引？
为了一次建立多个索引，您需要使用createIndexes()多个键并将其传递到数组中。以下是一次建立多个索引的查询。
>db.multipleIndexesDemo.createIndexes([{"First":1},{"Second":1},{"Third":1},{"Fourth":1},{"Fifth":1}]);这将产生以下输出
{
"createdCollectionAutomatically" : true,
"numIndexesBefore" : 1,
"numIndexesAfter" : 6,
"ok" : 1
}现在获取所有索引
> db.multipleIndexesDemo.getIndexes();
这将产生以下输出
[
{
"v" : 2,
"key" : {
"_id" : 1
},
"name" : "_id_",
"ns" : "test.multipleIndexesDemo"
},
{
"v" : 2,
"key" : {
"First" : 1
},
"name" : "First_1",
"ns" : "test.multipleIndexesDemo"
},
{
"v" : 2,
"key" : {
"Second" : 1
},
"name" : "Second_1",
"ns" : "test.multipleIndexesDemo"
},
{
"v" : 2,
"key" : {
"Third" : 1
},
"name" : "Third_1",
"ns" : "test.multipleIndexesDemo"
},
{
"v" : 2,
"key" : {
"Fourth" : 1
},
"name" : "Fourth_1",
"ns" : "test.multipleIndexesDemo"
},
{
"v" : 2,
"key" : {
"Fifth" : 1
},
"name" : "Fifth_1",
"ns" : "test.multipleIndexesDemo"
}
]