M101JS HOMEWORK 6

To find out more, including how to control cookies, see here: The final lectures of the course are about the way you scale horizontally in MongoDB. In the second section, Homework , I will mention what I learned from practicing the homework assignments and anything I might have done extra because of it. To start, please download sysprofile. Don’t remove a quiz or an exam!

The lectures started with explaining what replication is and how it works in MongoDB. For companies in our collection founded in and having 5 or more rounds of funding, calculate the average amount raised in each round of funding. To confirm you are on the right track, here are some queries to run after you process the data with the correct answer shown: This is a sample document from the weather data collection: You are commenting using your Facebook account. When it comes to sharding, it will probably be about the shard key and the implications of using a particular key.

You should not need to touch any other code. Let us count the number of students we have: For companies in our collection founded in and having 5 or more rounds of funding, calculate the average amount raised in each round of funding.

It had been a while when I saw code to connect with MongoDB. You might want to start by inspecting it homewori the Mongo shell.

Replication The lectures started with explaining what replication is and how it works in MongoDB. Your assignment is to figure out the “State” that recorded the lowest “Temperature” when the wind was coming from the west “Wind Homrwork between homwork The last assignment was setting up the sharded environment, not much trouble with that because I knew it from my M101ms course and the script was pretty much handed to me.

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Sarath April 30, at It had been a while when I saw code to connect with MongoDB. Unique indexes in a sharded environment need to include the shard key. Picking the shard key The best way to pick a shard key is to figure out the usage pattern of your data.

m101js homework 6

By setting a read preference it is possible to read from secondary nodes as well. When the master node is unresponsive for some time, failover will occur and a new primary node is elected. Note that not all students in homeworo same class have the same exact number of assessments.

m101js homework 6

This involves calculating an average for each student in each class of all non-quiz assessments and then averaging those numbers to get a class average. Email required Address never made public. The final homewok of the course are about the way you scale horizontally in MongoDB. Which writes finished successfully, since some might still be buffered?

The application code can keep sending its asynchronous requests and at some time in the future they will return. By fast, we mean that indexes should be in place to satisfy these queries such that we only need to scan the number of documents we are going to return. We are also providing a patriotic if you are an American data set for the blog. Do not include the surrounding quotes in providing hommework answer.

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You have really selected the suitable topic node. Now query the profile data, looking for all queries to the students collection in the database school2, sorted in order of decreasing latency.

MJS Week 6 – Glimpses of Daniel’s world

Express server listening on port If you m101ms http: Two questions covered replication in MongoDB and the other two tested the sharding knowledge. You are commenting using your Facebook account. Write concern instructs the driver to wait until the data has passed a certain point of persistence.

Note you will need to have your path setup correctly to find mongorestore. The lectures started with explaining what replication is and how it works in MongoDB.

Hello from MongoDB!

Note that this is only an example and not the actual document that you would be updating. Tag sets A topic not covered during this course is tag sets. Sarath April 30, at 6: Download the homewkrk and import the grades collection using the following command. Do this by opening a terminal window mac or cmd window windows and navigating to the directory so that the dump directory is directly beneath you.