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Rebuilding indexes in MongoDB?
To rebuild indexes, use reIndex(). Let us first create an index. Following is the query −
> db.demo42.createIndex({"StudentFirstName":1});This will produce the following output −
{
"createdCollectionAutomatically" : true,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}Following is the query to rebuild index in MongoDB −
> db.demo42.reIndex({"StudentFirstName":1});This will produce the following output −
{
"nIndexesWas" : 2,
"nIndexes" : 2,
"indexes" : [
{
"v" : 2,
"key" : {
"_id" : 1
},
"name" : "_id_",
"ns" : "web.demo42"
},
{
"v" : 2,
"key" : {
"StudentFirstName" : 1
},
"name" : "StudentFirstName_1",
"ns" : "web.demo42"
}
],
"ok" : 1
}
Updated on: 03-Apr-2020
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