What could potentially improve the speed of inserts. Limit Number of Elements in an Array after an Update: To do this, you will need to unwind the To list for each message. Import it into your mongod using the following command from the command line: One patient may have dozens or even hundreds of documents in the record collection. For reference, the number of email messages from Andrew Fastow to John Lavorato john. Newer Post Older Post Home.

Please download the Enron email dataset enron. Now issue the following command to reload your repository: Newer Post Older Post Home. Every image is supposed to be in an album, but there are orphan images that appear in no album. When you are done removing the orphan images from the collection, there should be 90, documents in the images collection.

The query performed a full collection scan. Imagine an electronic medical record database designed to hold the medical hava of every individual in the United States. Model Data for Atomic Operations. Limit Number of Elements in an Array after an Update: Model Tree Structures with Nested Sets. You should see three files at the highest level: A typical loop through results looks like the following: We need to decide on a shard key to shard the record collection.


There was one additional program that mongoodb have been downloaded in the project called validate. MongoDB supports MapReduce and other aggregation tools.

The database consists of two collections, albums, and images.

MongodbChamps: MJ: MongoDB for Java Developers Homework

Model Tree Structures with Child References. The query did not utilize an index to figure out which documents match the find criteria.

homework 2.2 mongodb java

This problem is a little tricky because a recipient may appear more than once in the To list for a message. For this question you will use the aggregation framework to figure out pairs of people that tend to bomework a lot. For information on how applications might use indexes, see Indexing Strategies.

homework 2.2 mongodb java

Which of the choices below is the title of a movie from the year that is rated PG and won no awards? The templates comprise the view.

Remove a Single Document that Matches a Condition: Find all exam scores greater than or equal to 65, and sort those scores from lowest to highest. Now ajva you want to run the following query against the collection. Perform Two Phase Commits: Model Tree Structures with an Array of Ancestors. ObjectId “52c52addead11dc50″”type”: For Single Rerod rank limit always 1. Check below all the statements that are true nomework the way MongoDB handled this query.


Notes on validation The Python validation script requires the following python modules be installed on your computer: Create a Unique Index. In this problem, you will be using a collection of student scores that is similar to what we used in the lessons. homewor

MongoDB Java

ObjectId “52c54de5ead11dc5a””fname”: Please query the video. Limit Fields to Return from a Query: That homewrk, think mostly about the operational aspects of such a system. To do this, you will need to unwind the To list for each message. Here are some example documents not from the collections you will be downloading.