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Redisquery~5 mins

RENAME and RENAMENX in Redis - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What does the RENAME command do in Redis?
The RENAME command changes the name of an existing key to a new name, overwriting the new key if it already exists.
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beginner
How does RENAMENX differ from RENAME in Redis?
RENAMENX renames a key only if the new key name does not already exist. If the new key exists, it does nothing and returns 0.
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beginner
What happens if you use RENAME on a key that does not exist?
Redis returns an error because the source key must exist to be renamed.
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beginner
What is the return value of RENAMENX when the rename is successful?
RENAMENX returns 1 if the key was renamed successfully.
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beginner
Can RENAME overwrite an existing key in Redis?
Yes, RENAME will overwrite the destination key if it already exists.
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What does the RENAME command do if the new key already exists?
AIt merges both keys
BIt returns an error
CIt does nothing and returns 0
DIt overwrites the existing key with the old key's value
What does RENAMENX return if the new key name already exists?
A1
B0
CAn error message
DThe old key's value
Which command will rename a key only if the new key does not exist?
ARENAMENX
BRENAME
CDEL
DEXISTS
What happens if you try to RENAME a key that does not exist?
ARedis returns an error
BIt returns 0
CThe command creates a new key
DIt renames to an empty key
Which command can overwrite an existing key in Redis?
ASETNX
BRENAMENX
CRENAME
DGET
Explain the difference between RENAME and RENAMENX commands in Redis.
Think about what happens when the new key already exists.
You got /4 concepts.
    Describe what happens when you use RENAME on a key that does not exist.
    Consider the requirement for the source key.
    You got /3 concepts.