M101JS HOMEWORK 6

Horizontal scaling is done by making shards of the collection that will be distributed over replication sets. In the previous weeks the focus was less on connecting to the database and directed more at making the code work for the homework assignment. You should not need to touch any other code. For this series of blog posts I will structure each post into an introduction you just passed it and two sections. Tag sets A topic not covered during this course is tag sets.

The shard key must be present in each document. Considerations when pick the shard key are: Electing a new primary node will take some time As always, network errors might occur and should be handled elegantly Failover with Node. Your task is to calculate the class with the best average student performance. By default reads can only be done against the primary. The blog stores its data in the blog database in two collections, users and sessions.

Electing a new primary node will take some time As always, network errors might occur and should be handled elegantly Failover with Node. Now query the profile data, looking for all queries to the students collection in the database school2, sorted in order of decreasing latency.

With it, you can test your code and look at the Feedback section.

Hello from MongoDB!

This week I scanned the homework assignments before I started with the lectures. Post was not sent – check your email addresses!

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Download the handout and import the grades collection using the following command. Write concern instructs the driver to wait until the data has passed a certain point of persistence.

MJS Week 6 – Glimpses of Daniel’s world

M101je that text in the text box below. This site uses cookies. Note that not all students in the same class have the same exact number of assessments. Two questions covered replication in MongoDB and the other two tested the sharding knowledge. This is a comma separated value file that you can import into MongoDB as follows:.

Posted m101jjs Unknown at Your assignment for this part of the homework is to install the mongodb driver for Node.

Notify me of new comments via email. Then you can iterate through the documents and know that whenever the state changes you have reached the highest temperature for that state.

Even with the driver handling buffering of requests, do you still need to handle errors of too many open files? Do not include the surrounding quotes in providing your answer. A topic not covered during this course is tag sets.

MJS Week 6 – Glimpses of Daniel’s world

Who is the easiest grader on campus? It had been a while when I saw code to connect with MongoDB.

m101js homework 6

You might want to start by inspecting it in the Mongo shell. Remember, just remove a homework score.

The data on the primary is most up to date, so it makes sense it is the default for reads. However, when asked about replication I gave too much credit to the mongo shell. In the second section, HomeworkI will mention what I learned from practicing the homework assignments and anything I might have done extra because of it.

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The last assignment was setting up the sharded environment, not much trouble with that because I knew it from my M course and the script was pretty much handed to me. For this series of blog posts I will structure each post into an introduction you just passed it and two sections.

m101js homework 6

Even with the driver handling buffering of requests, do you still need to handle errors of too many open files? The final lectures of the course are about the way you scale horizontally in MongoDB. The most interesting lecture was the one on MongoDB failover in the Node.

m101js homework 6

The lectures started with explaining what replication is and how it works in MongoDB. Fill in your details below or click an icon to log in: You homedork commenting using your Facebook account. Tag sets A topic not covered during this course is tag sets.