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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?
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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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Answer

When Redis starts, it loads its dataset from either the AOF file or the RDB snapshot depending on your configuration, and since AOF files can be significantly larger and require replaying potentially many individual write operations, startup time using AOF can be noticeably slower for very large datasets compared to loading a single compact RDB snapshot directly into memory.
-- Check current persistence configuration affecting startup behavior
CONFIG GET appendonly
CONFIG GET dir
Real-world example A team notices their Redis instance takes significantly longer to restart after enabling AOF for a very large dataset, and mitigates this by ensuring AOF rewrites happen regularly to keep the file as compact as possible.

Common follow-ups: How do you measure and test Redis startup time for your specific dataset size?;Are there configuration options to speed up AOF loading during startup?

Redis Architecture & Installation;Redis Performance Tuning & Benchmarking
All 7 Persistence (RDB/AOF) questions