Batch writes in Firebase - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a batch write in Firebase?

A batch write lets you group multiple write operations (like create, update, delete) together so they all happen at once. This means either all succeed or none do.

beginner

Why use batch writes instead of individual writes?

Batch writes save time and reduce errors by sending many changes in one go. They also keep data consistent because all changes apply together or not at all.

intermediate

What is the maximum number of operations allowed in a single Firebase batch write?

A single batch write can include up to 500 operations.

intermediate

How does Firebase handle errors in batch writes?

If any operation in the batch fails, none of the changes are applied. This keeps your data safe and consistent.

intermediate

Can batch writes read data before writing in Firebase?

No, batch writes only perform write operations. To read data before writing, use transactions instead.

What happens if one operation in a Firebase batch write fails?

A All operations are rolled back; no changes are made.

B Only the failed operation is skipped; others succeed.

C The batch write retries automatically until success.

D The batch write partially applies changes.

Firebase batch writes are atomic. If one operation fails, none of the changes are applied.

What is the maximum number of write operations you can include in a Firebase batch write?

A 1000

B 200

C 100

D 500

Firebase batch writes support up to 500 operations per batch.

Which Firebase feature should you use if you need to read data before writing?

A Batch writes

B Cloud Functions

C Transactions

D Realtime Database

Transactions allow reading data and then writing based on that data.

Why are batch writes useful in Firebase?

A They allow multiple writes to happen at once atomically.

B They automatically back up your data.

C They speed up data reads.

D They encrypt data before writing.

Batch writes group multiple write operations so they succeed or fail together.

Can batch writes be used to update multiple documents in Firebase?

A No, batch writes only delete documents.

B Yes, batch writes can update multiple documents at once.

C No, batch writes only create new documents.

D Yes, but only if documents are in the same collection.

Batch writes can create, update, or delete multiple documents in one atomic operation.

Explain what a batch write is in Firebase and why it is useful.

Think about doing many changes at once safely.

Describe the difference between batch writes and transactions in Firebase.

One can read before writing, the other cannot.