MULTI command to start in Redis - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the MULTI command do in Redis?

The MULTI command starts a transaction block in Redis. It queues multiple commands so they can be executed together atomically with EXEC.

beginner

How do you execute all commands queued after MULTI in Redis?

You use the EXEC command to execute all the commands queued after MULTI as a single atomic transaction.

intermediate

What happens if you call DISCARD after MULTI in Redis?

DISCARD cancels the transaction and clears all queued commands after MULTI without executing them.

intermediate

Can commands inside a MULTI block in Redis fail individually?

No, commands are queued and only executed together with EXEC. If one command fails during execution, the whole transaction still runs but errors are reported per command.

beginner

Why use MULTI in Redis instead of running commands one by one?

Using MULTI ensures commands run atomically, so no other client can run commands in between. This keeps data consistent and avoids race conditions.

What is the first command to start a transaction in Redis?

A EXEC

B WATCH

C DISCARD

D MULTI

MULTI starts the transaction block by queuing commands.

Which command executes all queued commands after MULTI?

A MULTI

B DISCARD

C EXEC

D FLUSH

EXEC runs all commands queued after MULTI atomically.

What does DISCARD do in a Redis transaction?

A Starts a transaction

B Cancels the transaction and clears queued commands

C Locks keys for transaction

D Executes queued commands

DISCARD cancels the transaction and clears all queued commands.

If a command inside MULTI fails, what happens?

A All commands run, errors reported per command

B Only the failed command is skipped

C The whole transaction is aborted

D Redis crashes

All commands run atomically; errors are reported individually.

Why use MULTI in Redis?

A To run commands atomically

B To delete keys

C To speed up commands

D To monitor commands

MULTI ensures commands run atomically without interference.

Explain how the MULTI command works in Redis and how it relates to EXEC and DISCARD.

Think about starting, running, or canceling a group of commands.

Why is atomicity important in Redis transactions started with MULTI?

Consider what happens if commands run one by one without control.