43 lines
1.4 KiB
Markdown
43 lines
1.4 KiB
Markdown
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---
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title: Configure Memory Limits and Eviction Policies
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impact: HIGH
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impactDescription: Prevents out-of-memory crashes and unpredictable behavior
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tags: memory, maxmemory, eviction, lru, ttl
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description: Configure Memory Limits and Eviction Policies
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alwaysApply: true
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---
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## Configure Memory Limits and Eviction Policies
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Always configure `maxmemory` and an eviction policy to prevent Redis from consuming all available memory.
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**Correct:** Set explicit memory limits.
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```
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maxmemory 2gb
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maxmemory-policy allkeys-lru
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```
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| Policy | Use Case |
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|--------|----------|
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| `volatile-lru` | Evict keys with TTL, least recently used first |
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| `allkeys-lru` | Evict any key, least recently used first |
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| `volatile-ttl` | Evict keys closest to expiration |
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| `noeviction` | Return errors when memory is full (use for critical data) |
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**Incorrect:** Running Redis without memory limits.
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```
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# No maxmemory set - Redis will use all available RAM
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# Can cause OOM killer to terminate Redis or other processes
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```
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**Memory optimization tips:**
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- Use Hashes for small objects (more memory-efficient than separate keys)
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- Use `OBJECT ENCODING key` to check how Redis stores your data
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- Use `MEMORY USAGE key` to check individual key memory consumption
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- Enable compression in your client for large values
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Reference: [Redis Memory Optimization](https://redis.io/docs/latest/operate/oss_and_stack/management/optimization/memory-optimization/)
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