RDB configuration (save intervals) in Redis - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does RDB stand for in Redis?

RDB stands for Redis Database Backup, which is a snapshot file format used to save the state of the Redis database to disk.

beginner

What is the purpose of 'save intervals' in Redis RDB configuration?

Save intervals define when Redis automatically creates a snapshot of the database based on time and the number of changes made.

intermediate

How is a save interval configured in the Redis configuration file?

Using the 'save' directive, for example: <br>save 900 1<br>means save after 900 seconds if at least 1 key changed.

intermediate

What happens if you set multiple save intervals in Redis?

Redis will save the database snapshot if any of the conditions are met, for example:<br>save 900 1<br>save 300 10<br>save 60 10000<br>means save after 900 seconds if 1 change, or 300 seconds if 10 changes, or 60 seconds if 10000 changes.

intermediate

How can you disable automatic RDB snapshots in Redis?

By removing all 'save' directives from the configuration file or commenting them out, Redis will not create automatic snapshots.

What does the Redis configuration line 'save 600 100' mean?

A Save the DB every 600 seconds regardless of changes

B Save the DB every 100 seconds if at least 600 keys changed

C Save the DB every 100 seconds regardless of changes

D Save the DB every 600 seconds if at least 100 keys changed

The format is 'save ', so it saves after 600 seconds if 100 or more keys changed.

If you want Redis to never save snapshots automatically, what should you do?

A Set 'save 1 1' in the config

B Set 'save 0 0' in the config

C Remove or comment out all 'save' lines

D Set 'save 3600 1000' in the config

Removing or commenting out all 'save' lines disables automatic snapshots.

Which of these is NOT a valid Redis save interval configuration?

A save 60 0

B save 300 10

C save 60 10000

D save 900 1

The number of changes must be greater than zero; 'save 60 0' is invalid.

What file does Redis create when it saves an RDB snapshot?

A dump.rdb

B redis.rdb

C snapshot.rdb

D save.rdb

Redis saves snapshots to a file named 'dump.rdb' by default.

If Redis is configured with 'save 900 1' and 'save 300 10', when will it save?

A Only after 300 seconds if 10 changes

B After 900 seconds if 1 change OR after 300 seconds if 10 changes

C Only after 900 seconds if 1 change

D After 300 seconds regardless of changes

Redis saves if any save condition is met.

Explain how Redis uses save intervals to create RDB snapshots.

Think about how Redis decides when to save based on time and changes.

Describe how to disable automatic RDB snapshots in Redis and why you might want to do that.

Consider what happens if Redis never saves snapshots automatically.