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Diffstat (limited to 'iredis/data/commands/memory-usage.md')
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diff --git a/iredis/data/commands/memory-usage.md b/iredis/data/commands/memory-usage.md new file mode 100644 index 0000000..73e26d7 --- /dev/null +++ b/iredis/data/commands/memory-usage.md @@ -0,0 +1,40 @@ +The `MEMORY USAGE` command reports the number of bytes that a key and its value +require to be stored in RAM. + +The reported usage is the total of memory allocations for data and +administrative overheads that a key its value require. + +For nested data types, the optional `SAMPLES` option can be provided, where +`count` is the number of sampled nested values. By default, this option is set +to `5`. To sample the all of the nested values, use `SAMPLES 0`. + +@examples + +With Redis v4.0.1 64-bit and **jemalloc**, the empty string measures as follows: + +``` +> SET "" "" +OK +> MEMORY USAGE "" +(integer) 51 +``` + +These bytes are pure overhead at the moment as no actual data is stored, and are +used for maintaining the internal data structures of the server. Longer keys and +values show asymptotically linear usage. + +``` +> SET foo bar +OK +> MEMORY USAGE foo +(integer) 54 +> SET cento 01234567890123456789012345678901234567890123 +45678901234567890123456789012345678901234567890123456789 +OK +127.0.0.1:6379> MEMORY USAGE cento +(integer) 153 +``` + +@return + +@integer-reply: the memory usage in bytes |