HOMEWORK 2.2 MONGODB JAVA

ObjectId “52c54de5ead11dc5a” , “fname”: ObjectId “52c52addead11dc50” , “type”: To create a cursor with the shell, put some documents into a collection, do a query on them, and assign the results to a local variable variables defined with “var” are local. Create an Auto-Incrementing Sequence Field: One patient may have dozens or even hundreds of documents in the record collection.

Enter just the code, in the answer box below, no spaces. Like all Email messages, there is one sender but there can be multiple recipients. Understanding the output of explain We perform the following query on the enron dataset: ObjectId “52c52addead11dc51” , “egg”: Build Old Style Indexes. 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.

Jvaa All Fields in Matching Documents: Build Indexes on Replica Sets. The correct result will be: Perform Two Phase Commits: Newer Post Older Post Home.

Java MongoDB Tutorial

Return a List of All Indexes. Create a Sparse Index. Enter just the code, in the answer box below, no spaces.

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homework 2.2 mongodb java

ObjectId “52ce53dde88″”fname”: Please use the Enron dataset you imported for the previous problem. Supposed we executed the following Java code.

MongoDB Java

To create a cursor with the shell, put some documents into a collection, do a query on them, and assign the results to a local variable variables defined with “var” are local. MongoDB is a document database that provides high performance, high availability, and easy scalability.

Like all Email messages, there is one sender but there can be ohmework recipients. In the mongo shell, when you assign the cursor returned from the find method to a variable using the var keyword, the cursor does not automatically iterate.

MongoDB supports MapReduce and other aggregation tools. Now it’s your turn to analyze the data set.

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Note that this is an abbreviated version of the full corpus. You can call the cursor variable in the shell to iterate up to 20 times [1] and print the matching documents, as in homeworkk following example: Check all that apply. MongoDB Java Unknown Build a replica set and insert data into the secondary nodes to free up the primary nodes.

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Your task is to write a program to remove every image from the images collection that appears in no album.

homework 2.2 mongodb java

Download the HW from the Download Handout link and uncompress it. Use that data set to answer this question. Model Tree Structures with Parent References. Here, we create a very simple collection and query it, storing the results in the cursor variable: Indexes provide high performance read operations for frequently used queries.

[Solution] Week 2 : CRUD: MP: MongoDB for Developers

The query used an index for the sorting phase. The templates comprise the view. ObjectId “52c54c93ead11dc57″”fname”: The query returnedmonyodb Choice 4. Remove Documents that Matches a Condition: What could potentially improve the speed of inserts.

homework 2.2 mongodb java

ObjectId “52cdde87″”fname”: Here are some example documents not from the collections you will be downloading. The database consists of two collections, albums, and images.