使用MongoDB在后台构建索引
要在后台创建索引，请使用createIndex()方法并按照以下语法设置“background：true”-
db.yourCollectionName.createIndex({"yourFieldName1":1,"yourFieldName2":1},{background: true} );让我们实现上述语法以创建索引并设置背景-
> db.indexCreationDemo.createIndex({"StudentName":1,"StudentAge":1},{background: true} );
{
"createdCollectionAutomatically" : true,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}让我们显示索引-
> db.indexCreationDemo.getIndexes();
这将产生以下输出-
[
{
"v" : 2,
"key" : {
"_id" : 1
},
"name" : "_id_",
"ns" : "web.indexCreationDemo"
},
{
"v" : 2,
"key" : {
"StudentName" : 1,
"StudentAge" : 1
},
"name" : "StudentName_1_StudentAge_1",
"ns" : "web.indexCreationDemo",
"background" : true
}
]