EXEC to execute in Redis - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the Redis command EXEC do?

The EXEC command runs all the commands queued in a transaction started by MULTI. It executes them atomically (sequentially without interleaving from other clients).

beginner

Which Redis command must be called before EXEC to start queuing commands?

The MULTI command starts a transaction and queues commands until EXEC is called to execute them.

intermediate

What happens if a command inside a Redis transaction fails before EXEC is called?

Redis returns an error immediately for the invalid command (e.g., syntax error), does not queue it, but continues the transaction. EXEC executes all successfully queued commands.

beginner

Can Redis commands queued in a transaction be executed partially with EXEC?

No. EXEC executes all queued commands atomically.

beginner

How do you cancel a Redis transaction before calling EXEC?

Use the DISCARD command to cancel all queued commands and exit the transaction without executing them.

What is the purpose of the Redis EXEC command?

A Check the status of a transaction

B Start a new transaction

C Cancel the current transaction

D Execute all commands queued in a transaction

EXEC runs all commands queued after MULTI atomically.

Which command must be used before EXEC to queue commands in Redis?

A DISCARD

B EXEC

C MULTI

D WATCH

MULTI starts the transaction and queues commands until EXEC is called.

What happens if an invalid command is issued during a Redis transaction before EXEC runs?

A Only valid commands execute

B Transaction is aborted and no commands run

C Invalid commands are skipped

D Redis fixes the invalid command automatically

Invalid commands cause an error and are not queued; only valid commands execute on EXEC.

How can you cancel a Redis transaction before executing it?

A Use <code>EXEC</code>

B Use <code>DISCARD</code>

C Use <code>WATCH</code>

D Use <code>FLUSHDB</code>

DISCARD cancels all queued commands and exits the transaction.

Is it possible to execute only some commands from a Redis transaction with EXEC?

A No, all commands execute atomically

B Yes, you can choose commands to execute

C Yes, but only if commands are independent

D Only if you use <code>WATCH</code>

EXEC executes all queued commands atomically.

Explain how the Redis EXEC command works in a transaction.

Think about how transactions ensure all commands run together.

Describe the difference between EXEC and DISCARD in Redis transactions.

One commits the transaction, the other cancels it.