Persistence

Redis · Reference cheat sheet

📋 Overview

Redis can persist in-memory data via RDB snapshots, AOF logs, or both. Persistence improves durability but is not a substitute for backups and replication strategy.

🔧 Core concepts

💡 Examples

Check persistence config:

redis-cli CONFIG GET save
redis-cli CONFIG GET appendonly

Manual save:

BGSAVE
LASTSAVE

AOF rewrite:

BGREWRITEAOF

⚠️ Pitfalls

• appendfsync always is safest and slowest — usually everysec is the compromise.
• Forking for BGSAVE on large datasets needs free memory headroom.
• Restoring from outdated RDB after a crash still loses recent writes if AOF is off.

🔗 Related

• getting_started.md
• expiry_ttl.md
• cli_basics.md
• Comparisons/redis_vs_postgres.md