All 7 Persistence (RDB/AOF) questions
More in Persistence (RDB/AOF)
What is RDB persistence in Redis, and how does it work? What are the different appendfsync options available for AOF persistence, and how do they balance durability against performance? What is AOF rewriting, and why is it necessary as an append only file grows over time? What happens if Redis's persistence files, whether RDB or AOF, become corrupted, and how would you attempt to recover? How would you design a persistence strategy that combines both RDB and AOF to get the benefits of both approaches? What happens during Redis startup regarding data loading, and how does the choice between RDB and AOF affect startup time for a large dataset?
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Redis › Persistence (RDB/AOF)

What is AOF, or append only file, persistence, and how does it differ from RDB snapshots?

Beginner

Answer

AOF persistence logs every write operation to a file as it happens, rather than periodically saving the entire dataset at once like RDB, meaning it can offer much better durability with less potential data loss since nearly every write is recorded individually, though the resulting log file can grow significantly larger than an equivalent RDB snapshot.
CONFIG SET appendonly yes
CONFIG SET appendfsync everysec
Real-world example A financial application enables AOF persistence to minimize the risk of losing recent transactions, accepting the larger file size in exchange for the much stronger durability guarantee it provides over RDB snapshots alone.

Common follow-ups: What does the appendfsync setting control, and what are the different options?;Can RDB and AOF persistence be used together at the same time?

Redis Backup & Disaster Recovery;Transactions & ACID
All 7 Persistence (RDB/AOF) questions