Did you notice the links in the previous sentence? Which of the following statements are true about choosing and using a shard key? Download the HW from the Download Handout link and uncompress it. When you are done removing the orphan images from the collection, there should be 90, documents in the images collection. It has been tested under Pymongo 2.

You can call the cursor variable in the shell to iterate up to 20 times [1] and print the matching documents, as in the following example: 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. Limit Fields to Return from a Query: Remove a Single Document that Matches a Condition: The query uses an index to determine which documents match. Now query the profile data, looking for all queries to the students collection in the database school2 , sorted in order of decreasing latency. You will run validation.

The areas where you need to add code are marked with XXX. Build Indexes on Replica Sets. Note that this directions are identical to what we taught you within the lessons and you should already have PyMongo 3.


Download the handout and run it as follows: Failed with error ‘migration already in progress’, from s0 to s1 databases: In this homework you will add code to your blog so that it accepts comments. The browser is probably wrapping them visually.


You can type rs. ObjectId “52c52addead11dc52″”type”: Querying with Sort, Skip and Limit.

But you can, for fun. To create a cursor with the shell, put some documents into a collection, do a query hokework them, and assign the results to a local variable variables defined with “var” are local.

MongoDB university m101p chapter 6 homework

Validate connects to localhost: Enhancing the Blog to support viewers liking certain comments In this problem, you will be enhancing the blog project to support users liking certain comments and the like counts showing up the in the permalink page. As a reminder, to run your blog you type python blog.

Please put just the 4-digit number into the box below no spaces. If you prefer, you may download the handout and perform your analysis on your machine with.

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MongoDB supports MapReduce and other aggregation tools. ObjectId “52c52addead11dc50″”type”: Here, s1 is only involved in the query.

homework 6.4 mongodb

Please download the Enron email dataset enron. Return All Fields in Matching Documents: You can call the cursor variable in the shell to iterate up to 20 times [1] and homewofk the matching documents, as in the following example: Build Old Style Indexes.


Use mongorestore to restore the dump into your running mongod. That will return one document. Your task is to calculate the class with monodb best average student performance. Next, go into the Mongo shell, perform a findOne on the collection called hw1 in the database m It checks the web output as well as the database documents.

MongoDB Java

In this homework you will build a small replica set on your own computer. Model Tree Structures with Parent References. You can publish your goal here We can help you achieve it!

Homewrok everything is working properly, you should be able to start the blog by typing: For reference, the number of email messages from Andrew Fastow to John Lavorato john.

homework 6.4 mongodb

Note that you will need to get MongoDB installed and the homework dataset imported from the previous homework before attempting this problem. The output of sh. The blog has been enhanced so that it can also display the top 10 most recent posts by tag.