The MEMORY STATS command returns an @array-reply about the memory usage of the server.

The information about memory usage is provided as metrics and their respective values. The following metrics are reported:

• peak.allocated: Peak memory consumed by Redis in bytes (see INFO's used_memory)
• total.allocated: Total number of bytes allocated by Redis using its allocator (see INFO's used_memory)
• startup.allocated: Initial amount of memory consumed by Redis at startup in bytes (see INFO's used_memory_startup)
• replication.backlog: Size in bytes of the replication backlog (see INFO's repl_backlog_size)
• clients.slaves: The total size in bytes of all slaves overheads (output and query buffers, connection contexts)
• clients.normal: The total size in bytes of all clients overheads (output and query buffers, connection contexts)
• aof.buffer: The summed size in bytes of the current and rewrite AOF buffers (see INFO's aof_buffer_length and aof_rewrite_buffer_length, respectively)
• dbXXX: For each of the server's databases, the overheads of the main and expiry dictionaries (overhead.hashtable.main and overhead.hashtable.expires, respectively) are reported in bytes
• overhead.total: The sum of all overheads, i.e. startup.allocated, replication.backlog, clients.slaves, clients.normal, aof.buffer and those of the internal data structures that are used in managing the Redis keyspace (see INFO's used_memory_overhead)
• keys.count: The total number of keys stored across all databases in the server
• keys.bytes-per-key: The ratio between net memory usage (total.allocated minus startup.allocated) and keys.count
• dataset.bytes: The size in bytes of the dataset, i.e. overhead.total subtracted from total.allocated (see INFO's used_memory_dataset)
• dataset.percentage: The percentage of dataset.bytes out of the net memory usage
• peak.percentage: The percentage of peak.allocated out of total.allocated
• fragmentation: See INFO's mem_fragmentation_ratio

@return

@array-reply: nested list of memory usage metrics and their values