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Find largest document size in MongoDB?
To find the largest document size in MongoDB, you need to write a script in the shell.
To understand the concept, let us create a collection with the document. The query to create a collection with a document is as follows −
> db.largestDocumentDemo.insertOne({"StudentName":"John"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8ed2e32f684a30fbdfd57d")
}
> db.largestDocumentDemo.insertOne({"StudentName":"Carol","StudentAge":22,"StudentCountryName":"US","TechnicalSubject":["C","C++","Java","MySQL"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8ed3282f684a30fbdfd57e")
}
> db.largestDocumentDemo.insertOne({"StudentName":"Mike","StudentAge":22});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8ed3382f684a30fbdfd57f")
}Display all documents from a collection with the help of find() method. The query is as follows −
> db.largestDocumentDemo.find().pretty();
The following is the output −
{ "_id" : ObjectId("5c8ed2e32f684a30fbdfd57d"), "StudentName" : "John" }
{
"_id" : ObjectId("5c8ed3282f684a30fbdfd57e"),
"StudentName" : "Carol",
"StudentAge" : 22,
"StudentCountryName" : "US",
"TechnicalSubject" : [
"C",
"C++",
"Java",
"MySQL"
]
}
{
"_id" : ObjectId("5c8ed3382f684a30fbdfd57f"),
"StudentName" : "Mike",
"StudentAge" : 22
}Here is the query to find the largest document size in MongoDB −
> var largestDocumentSize = 0;
> db.largestDocumentDemo.find().forEach(function(myObject) {
... var currentDocumentSize = Object.bsonsize(myObject);
... if(largestDocumentSize < currentDocumentSize ) {
... largestDocumentSize = currentDocumentSize ;
... }
... });
> print('The Largest Document Size =' + ' ' +largestDocumentSize);The following is the output displaying the largest document size −
The Largest Document Size = 160
Updated on: 30-Jul-2019
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