APPEND
Append bytes to a string value; returns the new length.
APPEND key valueComplexity
O(1) amortised while the value is <= 64 B; O(N) per call once it exceeds that (the Arc payload is copied out and re-boxed on every append), so building a large string by repeated APPEND is O(N^2)
Complexity and compatibility are read out of kevy's implementation, not copied from Redis's reference. Several genuinely differ.
Redis compatibility
Compatible
Behaves as Redis does.
See also
DECRDECRBYGETGETDELGETSETINCRINCRBYINCRBYFLOATMGETMSETPSETEXSETSETEXSETNXSTRLEN