How Do I Estimate Redis Memory Usage?
The estimated memory usage may be different from the actual memory usage. Currently, DCS for Redis provides the following memory-related metrics:
Metric ID |
Metric Name |
Description |
Value Range |
Monitored Object and Dimension |
Monitoring Period (Raw Data) |
|---|---|---|---|---|---|
memory_usage |
Memory Usage |
Memory consumed by the monitored object Unit: % |
0–100% |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
used_memory |
Used Memory |
Number of bytes used by the Redis server Unit: byte |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
used_memory_dataset |
Used Memory Dataset |
Dataset memory that the Redis server has used Unit: byte |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Supported by Redis 4.0 and later Dimension: dcs_instance_id |
1 minute |
used_memory_dataset_perc |
Used Memory Dataset Ratio |
Percentage of data memory that Redis has used to the total used memory Unit: % |
0–100% |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Supported by Redis 4.0 and later Dimension: dcs_instance_id |
1 minute |
used_memory_rss |
Used Memory RSS |
Resident set size (RSS) memory that the Redis server has used, which is the memory that actually resides in the memory, including all stack and heap memory but not swapped-out memory Unit: byte |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
memory_frag_ratio |
Memory Fragmentation Ratio |
Current memory fragmentation, which is the ratio between used_memory_rss/used_memory. |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
used_memory_peak |
Used Memory Peak |
Peak memory consumed by Redis since the Redis server last started Unit: byte |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
used_memory_lua |
Used Memory Lua |
Number of bytes used by the Lua engine Unit: byte |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
Metric ID |
Metric Name |
Description |
Value Range |
Monitored Object and Dimension |
Monitoring Period (Raw Data) |
|---|---|---|---|---|---|
memory_usage |
Memory Usage |
Memory consumed by the monitored object Unit: % |
0–100% |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
used_memory |
Used Memory |
Number of bytes used by the Redis server Unit: byte |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
used_memory_dataset |
Used Memory Dataset |
Dataset memory that the Redis server has used Unit: byte |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
memory_frag_ratio |
Memory Fragmentation Ratio |
Ratio between Used Memory RSS and Used Memory |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
used_memory_lua |
Used Memory Lua |
Number of bytes used by the Lua engine Unit: byte |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
used_memory_peak |
Used Memory Peak |
Peak memory consumed by Redis since the Redis server last started Unit: byte |
≥ 0 |
Monitored object: Single-node, master/standby, or cluster DCS Redis instance Dimension: dcs_instance_id |
1 minute |
Redis Usage FAQs
- Can I Change the CPU Architecture?
- Can I Change the AZ for an Instance?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Why Do I Fail to Delete an Instance?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- What Should I Do If an Error Occurs in redis_exporter?
- What Is Reserved Memory? How Do I Configure Reserved Memory?
- Why Is Available Memory Smaller Than Instance Cache Size?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Does DCS for Redis Provide Backend Management Software?
- Can I Recover Deleted Data of a DCS Instance?
- Why Is Available Memory of Unused DCS Instances Less Than Total Memory and Why Is Memory Usage of Unused DCS Instances Greater Than Zero?
- How Do I Estimate Redis Memory Usage?
- Why Is the Capacity or Performance of a Shard of a Redis Cluster Instance Overloaded When That of the Instance Is Still Below the Bottleneck?
- Why Does an OOM Error Occur During a Redis Connection?
- What Clients Can I Use for Redis Cluster in Different Programming Languages?
- Why Do I Need to Configure Timeout for Redis Cluster?
- Why Am I Seeing a Timeout Error When Reading Data from Redis?
- Explaining and Using Hash Tags
- Why Does a Key Disappear in Redis?
- Will Cached Data Be Retained After an Instance Is Restarted?
- How Do I Know Whether an Instance Is Single-DB or Multi-DB?
- What Are the Constraints on Implementing Multi-DB on a Proxy Cluster Instance?
- How Do I Buy a Multi-DB Proxy Cluster Instance?
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