Text indexes for search in MongoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a text index in MongoDB?

A text index in MongoDB allows you to perform efficient text search on string content within documents. It indexes the text fields to quickly find documents matching search terms.

beginner

How do you create a text index on a field named 'description' in MongoDB?

Use the command: <br>db.collection.createIndex({ description: "text" })<br>This creates a text index on the 'description' field for text search.

beginner

What operator is used to perform a text search query in MongoDB?

The $text operator is used in the query to search text indexed fields. For example: { $text: { $search: "keyword" } }

intermediate

Can you create a text index on multiple fields in MongoDB? How?

Yes, you can create a text index on multiple fields by specifying them with the value "text" in the index. For example:<br>db.collection.createIndex({ title: "text", description: "text" })

intermediate

What is the effect of the $language option in a text search query?

The $language option sets the language for the search to apply language-specific rules like stemming and stop words. For example, { $text: { $search: "run", $language: "english" } }.

Which MongoDB command creates a text index on the 'content' field?

A db.collection.createIndex({ content: 1 })

B db.collection.createTextIndex({ content: 1 })

C db.collection.createIndex({ content: "text" })

D db.collection.createText({ content: "text" })

The correct syntax to create a text index is using createIndex with the field set to "text".

What operator do you use to search text indexed fields in MongoDB?

A $search

B $indexText

C $findText

D $text

The $text operator is used in queries to perform text search on text indexed fields.

Can a MongoDB collection have only one text index?

A Yes, only one text index per collection is allowed

B No, multiple text indexes are allowed

C Yes, but only if fields are different

D No, text indexes are unlimited

MongoDB allows only one text index per collection, but it can cover multiple fields.

What does the $language option do in a text search query?

A Sets the language for stemming and stop words in search

B Specifies the language for sorting results

C Filters documents by language field

D Changes the database language

The $language option applies language-specific rules like stemming and stop words during text search.

Which of these queries searches for documents containing the word 'apple' in text indexed fields?

A { text: "apple" }

B { $text: { $search: "apple" } }

C { $search: "apple" }

D { $find: "apple" }

The correct query uses $text with $search to find documents matching the word 'apple'.

Explain how to create and use a text index in MongoDB for searching text fields.

Think about how to prepare the collection and then how to search.

Describe the role of the $language option in MongoDB text search and why it matters.

Consider how language rules affect word matching.