Server-Side Computing Model Quiz (Lec5)

insertOne

To query and retrieve documents from a collection

By using the limit method

updateOne

To uniquely identify a document

A callback function is a function that is passed as an argument into another function and can be invoked inside the outer function.

To make the program asynchronous and prevent I/O blocking.

function(err, results) { // code to be executed }

To pass an Error object if an error occurred.

The first argument of the callback function should be null.

Close MongoDB connection

To ensure that a field must have a value

Min

To validate that a field can only have specific values

To validate the format of a field

A tool for building MongoDB object modeling in Node.js

Object Document Mapper

Both A and B

They describe the data construct of a document and define the name and type of data

By using the mongoose.connect() function

Use npm to install the MongoDB Node.js driver.

To waterfall through function chains and handle errors in the original invoking function.

GET and POST

To run the startup script specified in the package.json file.

To check for connection and insertion errors.

Base64 encoding schemes are commonly used for storing and transferring binary data.

GridFS divides a file into parts, or chunks, and stores each chunk as a separate document.

16 megabytes

chunks and metadata

To store and retrieve files that exceed 16 megabytes in size

The purpose of Base64 encoding is to encode binary data in a way that it can be stored and transferred over media designed to deal with textual data. It ensures that the data remains intact without modification during transport.

The maximum size of a BSON document in MongoDB is 16MB.

GridFS is a specification for storing and retrieving files that exceed the BSON-document size limit of 16 megabytes. It divides a file into parts, or chunks, and stores each of those chunks as a separate document.

GridFS uses two collections to store files: the chunks collection, which stores the file chunks, and the files collection, which stores the file metadata.

GridFS is useful for storing files that exceed 16 megabytes, as well as for storing any files that you want to access without having to load the entire file into memory.

Pros: Allows for efficient storage and retrieval of album details and photos separately. Cons: Requires managing two separate storage systems, may introduce complexity in synchronizing album details and photos.

Pros: Simplifies storage and retrieval by keeping all data in one system. Cons: May introduce performance issues with large files, may require additional configuration for handling binary data.

The 'assert' module is used for basic assertion testing in the MongoDB Node.js driver. It is used to check if a given condition is true and throw an error if it is not.

The 'findOne' method is used to query a collection in MongoDB and retrieve the first document that matches the specified criteria.

The 'mimetype' field in the GridFS file metadata is used to store the MIME type of the file, which indicates the type of data contained in the file.