Composite index requirements in Firebase - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a composite index in Firebase?

A composite index in Firebase is an index that combines multiple fields from a collection to speed up queries that filter or sort by more than one field.

beginner

Why do you need composite indexes in Firebase?

You need composite indexes to efficiently run queries that use multiple where clauses or order by multiple fields, because single-field indexes alone cannot support these queries.

beginner

What happens if a required composite index is missing in Firebase?

Firebase will return an error with a direct link to create the missing composite index automatically in the Firebase console.

intermediate

Which query types require composite indexes in Firebase?

Queries that combine multiple filters (where clauses) on different fields, or queries that order by multiple fields, require composite indexes.

intermediate

How do you define a composite index in Firebase?

You define a composite index by specifying the collection and the fields with their sort order (ascending or descending) in the Firebase console or in the index configuration file.

What does a composite index in Firebase combine?

A Multiple fields from a collection

B Multiple collections

C Multiple databases

D Multiple users

A composite index combines multiple fields from a single collection to optimize queries.

When is a composite index required in Firebase?

A When reading a single document by ID

B When querying a single field only

C When querying multiple fields with filters or sorting

D When writing data

Composite indexes are needed when queries filter or sort by multiple fields.

What does Firebase do if a composite index is missing for a query?

A Automatically creates the index

B Ignores the query

C Runs the query slowly without an index

D Returns an error with a link to create the index

Firebase returns an error with a direct link to create the missing composite index.

How do you specify the order of fields in a composite index?

A By listing fields alphabetically

B By choosing ascending or descending for each field

C By the size of the field data

D By the number of documents

You specify ascending or descending order for each field in the composite index.

Which Firebase tool helps you create composite indexes?

A Firebase console

B Firebase CLI only

C Firebase Authentication

D Firebase Hosting

The Firebase console provides an interface to create and manage composite indexes.

Explain what a composite index is and why it is important in Firebase.

Think about how queries with multiple filters or sorts work.

Describe the process and tools used to create a composite index in Firebase.

Consider where you manage indexes in Firebase.