Specialized uses of Redis strings with the corresponding commands allow for the use of memory-efficient data structures in Redis for a comparatively small number of bits, and depending on your use case and data, using sets or hashes would offer better performance. In bitstrings
, 8 bits are stored per byte, with the first bit at position 0
being the significant one that is set to either 0 or 1. The maximum size for Redis bitstrings is 512 MB, the same limitation for all Redis keys and values.

One reason that makes a bitstring so efficient and fast is that most of its commands are the O(1)
or O(n)
operations. With SETBIT
and GETBIT
, bits are either set to 0
or 1
or the value retrieved by both O(1)
operations and the use of a bitstring to store the binary information across a range of sequential values is extremely fast. For the BITOP
, BITPOS
, and BITCOUNT
commands, the time complexity is O(n)
but offers power semantics for using bitstrings
.
A common use case for...