Run the INFO command and find the total_memory_used and sum of all the keys for all the databases.How to detect if memory is not reclaimed after expiry It’s only a problem when a large number of keys haven’t expired. If there are only a few keys that have expired and redis hasn’t deleted them - it is fine. The moment the key is accessed, it is deleted. This means that redis consumes memory to hold keys that have already expired. Since this algorithm is random, there are chances that the keys are not expired. Instead, it uses a randomized algorithm to find out keys that should be expired. When you set an expiry on a key, redis does not expire it at that instant. If your data size is expected to increase more than 3 GB then you should avoid switching. Trade offsįor the 32-bit Redis variant, any key name larger than 32 bits requires the key to span to multiple bytes, thereby increasing the memory usage. Switching to 32-bit from 64-bit machine can substantialy reduce the cost of the machine used and can optimize the usage of memory. This is because small keys are allocated full 64 bits resulting in the wastage of the unused bits.
But if you are sure that your data size does not exceed 3 GB then storing in 32 bits is a good option.Ħ4-bit systems use considerably more memory than 32-bit systems to store the same keys, especially if the keys and values are small. 1 Million Keys -> Hash value, representing an object with 5 fields, use ~ 160 MB of memory.Ħ4-bit has more memory available as compared to a 32-bit machine.1 Million small Keys -> String Value pairs use ~ 85MB of memory.An empty instance uses ~ 3MB of memory.Redis gives you the following statistics for a 64-bit machine. Do not hardcode and/or programmatically generate key names in your Lua scripts because it makes them useless in a clustered Redis setup.Remember to track your Lua memory consumption and flush the cache periodically with a SCRIPT FLUSH.Things to keep in mind if using dynamic Lua scripts So If you have to use dynamic scripting, then just use plain EVAL, as there’s no point in loading them first. memory used internally by Lua to keep the compiled byte-code.Memory used by the a_scripts dictionary holding original text.The memory consumption is because of the following factors. Memory is consumed as we have scripts loaded. Refrain from generating dynamic scripts, which can cause your Lua cache to grow and get out of control. Developer best practices Avoid dynamic Lua script To get the best performance out of your databases, make sure you are using the latest version of Redis. While RedisInsight can monitor the health of your databases, here are some tips to increase memory efficiency in Redis.
0 kommentar(er)
