如何在 MongoDB 中一次構建多個索引?
要一次構建多個索引,你需要使用 createIndexes() 並將多個鍵傳遞給一個數組。以下是在一次構建多個索引的查詢。
>db.multipleIndexesDemo.createIndexes([{"First":1},{"Second":1},{"Third":1},{"Fourth":1},{"Fifth":1}]);該查詢將產生以下輸出
{
"createdCollectionAutomatically" : true,
"numIndexesBefore" : 1,
"numIndexesAfter" : 6,
"ok" : 1
}現在獲取所有索引
> db.multipleIndexesDemo.getIndexes();
該查詢將產生以下輸出
[
{
"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"
}
]
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