Memory usage analysis (INFO memory) in Redis

Introduction

Memory usage analysis helps you understand how much memory your Redis server is using. This keeps your database fast and stable.

You want to check if your Redis server has enough memory for your data.

You notice Redis is slow and want to see if memory is the cause.

You want to plan for scaling your Redis server by knowing current memory use.

You want to find out how much memory different parts of Redis are using.

You want to monitor memory to avoid crashes due to running out of memory.

Syntax

Redis

INFO memory

This command returns detailed memory usage information from Redis.

You run it in the Redis command line or through a Redis client.

Examples

Shows all memory-related information about the Redis server.

Redis

INFO memory

Sample Program

This command returns memory stats like total used memory, peak memory, fragmentation ratio, and allocator info.

Redis

INFO memory

Important Notes

The 'used_memory' value shows the total bytes Redis is using.

The 'used_memory_rss' shows how much memory the operating system reports Redis is using.

A high 'mem_fragmentation_ratio' means Redis memory is fragmented and may waste RAM.

Summary

Use 'INFO memory' to check Redis memory usage anytime.

It helps you keep Redis fast by monitoring memory use.

Look at 'used_memory', 'used_memory_peak', and 'mem_fragmentation_ratio' for key info.