Mongo DB Solution

As per the statistics, 30 Million websites are developed and encoded by NodeJS. A large amount of companies are making efforts by vying their products to users. NodeJS has been a consistent supporter of creating web applications and interactive websites. Many giant companies such as Amazon, eBay, Netflix, Reddit, Linkedin, Tumblr, and PayPal have already [...]

Write a program in the language of your choice that will remove the lowest homework score for each student. Since there is a single document for each student containing an array of scores, you will need to update the scores array and remove the homework. Remember, just remove a homework score. Don't remove a quiz [...]

Final: Question 1 Please download the Enron email dataset enron.zip, unzip it and then restore it using mongorestore. It should restore to a collection called "messages" in a database called "enron". Note that this is an abbreviated version of the full corpus. There should be 120,477 documents after restore. Inspect a few of the documents [...]

You should see four files in the 'blog' directory: app.js, users.js, posts.js, and sessions.js. There is also a 'views' directory which contains the templates for the project and a 'routes' directory which contains our express routes. If everything is working properly, you should be able to start the blog by typing: npm install node app.js [...]

Write a program that finds the document with the highest recorded temperature for each state, and adds a "month_high" field for that document, setting its value to true. Use the weather dataset that you imported in HW 2.1. From the top of this page, there was one additional program that should have been downloaded:mongoProc. With [...]

Homework: Homework 6.5 In this homework, you will build a small replica set on your own computer. We will check that it works with validate.js, which you should download from the Download Handout link. Create three directories for the three mongod processes. On UNIX or mac, this could be done as follows: mkdir -p /data/rs1 [...]

Homework: Homework 6.4 You have a sharded system with three shards and have sharded the collections "students" in the "school" database across those shards. The output of sh.status() when connected to Mongos looks like this: mongos> sh.status() — Sharding Status — sharding version: { "_id" : 1, "minCompatibleVersion" : 5, "currentVersion" : 6, "clusterId" : [...]

Homework: Homework 6.3 Which of the following statements are true about choosing and using a shard key? MongoDB can not enforce unique indexes on a sharded collection other than the shard key itself, or indexes prefixed by the shard key. There must be an index on the collection that starts with the shard key. You [...]

Homework: Homework 6.2 Let's suppose you have a five-member replica set and want to assure that writes are committed to the journal and are acknowledged by at least 3 nodes before you proceed forward. What would be the appropriate settings for w and j? Solution: w="majority"

Homework: Homework 6.1 Which of the following statements are true about replication in MongoDB? Check all that apply.

The solution to Homework 5.4 M101JS: MongoDB for Node.js Developers Homework: Homework 5.4 Removing Rural Residents In this problem, you will calculate the number of people who live in a zip code in the US where the city starts with a digit. We will take that to mean they don't really live in a city. Once [...]

The solution to Homework 5.3 (Hands-On) M101JS: MongoDB for Node.js DevelopersWho's the easiest grader on campus?A set of grades are loaded into the grades collection. The documents look like this: { "_id" : ObjectId("50b59cd75bed76f46522c392"), "student_id" : 10, "class_id" : 5, "scores" : [ { "type" : "exam", "score" : 69.17634380939022 }, { "type" : "quiz", [...]

The solution to Homework 5.2 (Hands-On) M101JS: MongoDB for Node.js Developers Crunching the Zipcode datasetPlease calculate the average population of cities in California (abbreviation CA) and New York (NY) (taken together) with populations over 25,000. For this problem, assume that a city name that appears in more than one state represents two separate cities. Please [...]

Homework: Homework 5.1 (Hands-On) Finding the most frequent author of comments on your blog In this assignment, you will use the aggregation framework to find the most frequent author of comments on your blog. We will be using the same basic dataset as last week, with posts and comments shortened considerably, and with many fewer [...]

HOMEWORK: HOMEWORK 4.3 Solution to HOMEWORK 4.3 M101JS: MongoDB for Node.js Developers NOTE there is a bug (TOOLS-939) affecting some versions of mongoimport and mongorestore that causes mongoimport -d blog -c posts < posts.json to fail. As a workaround, you can usemongoimport -d blog -c posts < posts.json -batchSize 1.If you have any difficulty using MongoProc, [...]