Introduction to the MongoDB

The lecture introduces mongod and mongo shell, showing data storage, CRUD operations, and local or remote management, with notes on installation and Atlas.

Install MongoDB on your computer by visiting mongodb.com and selecting the community server for your OS. Learn that MongoDB Shell installs with the server, preparing you for the next lecture.

Connect to a running mongod with the mongo command, use version 4.0.0, and run db.version() and db.help(). Use show dbs, switch between admin and local, view startup_log, and run db.stats().

Install Robo 3T, connect to localhost on port 27017, and explore local databases like admin, local, and config. Run db.version() to view the MongoDB server version.

Explore common BSON types and their extended JSON representations, including string, object, boolean, array, double, NumberInt, NumberLong, ObjectID, and ISODate.

Learn how to create a MongoDB collection using db.createCollection in a forum database, create the posts collection, and verify it with show collections.

Download posts.txt containing objects to insert into the posts collection. Learn about fields like title, postId, comments, shared, tags, and author, and how JavaScript objects appear in the MongoDB shell.

Explore read operations in MongoDB by using find and findOne to retrieve multiple or a single document from a collection, such as posts, via a JavaScript object query.

Practice using MongoDB query operators to filter documents by comments and tags. Learn $gt, $lt, $and, $or, and $in in real examples.

Learn to use limit, skip, and sort on find queries in MongoDB, including ascending and descending orders for fields like comments and title.

Learn to use MongoDB update operators with updateOne, applying $set, $unset, and $inc to update documents in the posts collection, and verify results with findOne and updateMany.

Learn to delete documents in MongoDB using deleteOne and deleteMany by passing a query to remove one or all matching documents.

Explores how MongoDB uses indexes, including the default _id index, demonstrates querying with _id versus other fields, and explains when to add indexes for fields such as postId and tags.

Explore how a MongoDB replica set uses one primary for writes and multiple secondary nodes for replication, enabling reads from any node and automatic primary failover.