You will need to fix that in a stage of the aggregation before doing your grouping and counting of sender, recipient pairs. If you prefer, you may download the handout and perform your analysis on your machine with. To play with the blog you can navigate to the following URLs. Quick sign-up through social networks. 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. Querying with a Projection.

That is, think mostly about the operational aspects of such a system. 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. You have a sharded system with three shards and have sharded the collections “students” in the “school” database across those shards. Which of the following queries can utilize at least one index to find all matching documents or to sort?

For reference, the number of email messages from Andrew Fastow to John Lavorato john. The query uses an index to determine which documents match.


On unix, this could be done as follows:. What would be the appropriate settings for w and j? Ho,ework browser is probably wrapping them visually. Omit -p from mkdir.


MongoDB university m101p chapter 6 homework

Your task is to write a program to remove every image from the images collection that appears in no album. There must be a index on the collection that starts with the shard key. Perform Two Phase Commits: Which of the following statements are true about replication in MongoDB? Check below all the statements that are true about the way MongoDB handled this query.

There is also a views directory which contains the templates for the project. For those who are using MongoHQ, MongoLab or want to run homewor, webserver on a different host or port, there are some options to the validation script that can be exposed by running.

Model Data to Support Keyword Search.

The output of sh. Please choose your answer below for the most prolific comment author: ObjectId “52c54c93ead11dc57″”fname”: Ok, once you get the blog posts working, validate.

Check all that apply. Find all exam scores greater monfodb or equal to 65, and sort those scores from lowest to highest. The query performed a full collection scan. Create three directories for the three mongod processes.

homework 6.4 mongodb

ObjectId “52c52addead11dc52″”type”: Now Go to http: Connecting to a Replica Set from the Java Driver. Note you will need to have your yomework setup correctly to find mongorestore.


In the result set, only the item and qty fields return in the matching documents. There are three locations for you to add code for this problem.

Please enter just the number, with no spaces, commas or other characters. Like all Email messages, there is one sender but there can be multiple recipients. There are hyperlinks from the post tags to the page that displays the 10 most recent blog entries for that tag.

homework 6.4 mongodb

If you imported it correctly, you can go to the test database in the mongo shell and conform that. Since there is a single document for each student containing an array of scores, himework will need to update the scores array and remove the homework. The oplog utilizes a capped collection. Type the validation code below. Type the two-digit answer into the box below no spaces.

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