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Exercise 4: Adding processing options to the aggregation

MongoDB 301: Aggregation Building a Basic Aggregation Exercise 4: Adding processing options to the aggregation

In this exercise, you’ll add two processing options to the aggregate statement after the pipeline. Processing options make it possible to control how the aggregation is executed.

To add processing options to the aggregation

  1. On the IntelliShell tab, ensure that the aggregate statement you updated in the previous exercise is still entered at the command prompt.
  2. After the pipeline’s closing bracket, type a comma and insert a new line.
  3. On the new line after the pipeline, add the following options to the statement (before the aggregate method’s closing parenthesis):
{
  "allowDiskUse": true,
  "collation": { "locale": "en_US" }
}

This code adds two options to the aggregate statement:

  • When set to true, the allowDiskUse option enables the aggregation operations to write to temporary files, which can be useful with large data sets. 
  • The second option is collation, which specifies the collation to use for the aggregation. In this case, the collation is US English. 

The final aggregate statement should now look like the following code:

db.customers.aggregate(
  [
    { "$match": { "dob": { "$lt": ISODate("1970-01-01T00:00:00.000Z") } } },
    { "$group": 
      { "_id": "$address.state", "total": { "$sum": "$transactions" } } },
    { "$sort": { "total": -1 } }
  ],
  {
    "allowDiskUse": true,
    "collation": { "locale": "en_US" }
  }
);
  1. On the IntelliShell toolbar, click the Execute button. Studio 3T runs the aggregate statement and displays the results in the lower pane. The results are the same as those in the previous exercise.
  2. On the IntelliShell toolbar, click the Save button. This will allow you to save the aggregate statement to a script file with the .js extension. You’ll use this file in the next section of this course.
  3. In the Save Script dialog box, name the file state_transactions.js, navigate to a target folder, and click Save.
  4. Close the IntelliShell tab, and then close Studio 3T.

Quizzes
Building a Basic Aggregation: Test your skills
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  • Course Home Expand All
    Building a Basic Aggregation
    4 Topics | 1 Quiz
    Exercise 1: Filtering the documents in the aggregation pipeline
    Exercise 2: Grouping the documents in the aggregation pipeline
    Exercise 3: Sorting the documents in the aggregation pipeline
    Exercise 4: Adding processing options to the aggregation
    Building a Basic Aggregation: Test your skills
    Introducing the Aggregation Editor
    4 Topics | 1 Quiz
    Exercise 1: Importing an aggregate statement into the Aggregation Editor
    Exercise 2: Replace a field in the aggregation pipeline
    Exercise 3: Reorder the fields in the aggregation pipeline
    Exercise 4: Changing the sort order in the aggregation pipeline
    Introducing the Aggregation Editor: Test your skills
    Working with Arrays in the Aggregation Pipeline
    5 Topics | 1 Quiz
    Exercise 1: Using expression operators to filter input documents
    Exercise 2: Unwinding an array to create individual documents
    Exercise 3: Grouping array values and generating a document count for each group
    Exercise 4: Writing pipeline results to a new collection
    Working with Arrays in the Aggregation Pipeline: Test your skills
    MongoDB 301 Mid-Course Feedback
    Adding Lookup Data to the Aggregation Pipeline
    4 Topics | 1 Quiz
    Exercise 1: Adding lookup data to the aggregation pipeline
    Exercise 2: Converting string values in one of the lookup fields to integers
    Exercise 3: Adding a computed ratio field based on the converted lookup field
    Exercise 4: Limiting the number of returned documents
    Adding Lookup Data to the Aggregation Pipeline: Test your skills
    Working with Reschema for MongoDB
    4 Topics | 1 Quiz
    Exercise 1: Setting up a reschema unit that includes lookup data
    Exercise 2: Defining a target collection in the reschema unit
    Exercise 3: Adding and scheduling a task to create the target collection
    Exercise 4: Running an aggregate statement against the target collection
    Working with Reschema for MongoDB: Test your skills
    Reporting with Studio 3T Aggregations
    3 Topics | 1 Quiz
    Exercise 1: Creating a view based on an aggregation query
    Exercise 2: Exporting a collection as a .csv file for use by a third-party tool
    Exercise 3: Visualizing collection data in MongoDB Charts
    Reporting with Studio 3T Aggregations: Test your skills
    Course Extras
    Return to MongoDB 301: Aggregation
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