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(n) operations. With
GETBIT, bits are either set to
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
BITCOUNT commands, the time complexity is
O(n) but offers power semantics for using
A common use case for...