How to view memory usage of all keys in a database in Redis

Redis provides two commands to view the memory usage of all keys in the database: MEMORY USAGE allkeys: Returns the memory usage of all keys in the format: "key" (type) # Memory used (bytes) INFO MEMORY keyspace: Provides a detailed list of memory usage information for all keys in each database.

View memory usage of all keys in the database in Redis

Redis provides a variety of commands to view the memory footprint of all keys in the database.

1. MEMORY USAGE command

The MEMORY USAGE command returns the memory usage of the given key. The "allkeys" option is used to get the memory footprint of all keys.

 <code>redis> MEMORY USAGE allkeys # Key (type) # Memory used (bytes) "key1" (string) 64 "key2" (list) 512 "key3" (set) 256</code>

2. INFO MEMORY command

The INFO MEMORY command provides detailed information about Redis memory usage, including memory footprints for all keys.

 <code>redis> INFO MEMORY # Memory used_memory:9,968,976 used_memory_human:9.53M used_memory_rss:10,402,048 used_memory_rss_human:10.00M mem_fragmentation_ratio:1.04</code>

The INFO MEMORY command also provides a subcommand named keyspace that provides a detailed list of memory usage information for all keys in each database.

 <code>redis> INFO MEMORY keyspace # Database 0 keys=3 expires=1 avg_ttl=1,200,000,000 overhead=528 items=3 memory=1,228</code>

Both commands can be used to view the memory usage of all keys in the Redis database. The MEMORY USAGE allkeys command is simpler and easier to use, while the INFO MEMORY command provides more details.

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