TOPK.RESERVE
Syntax
TOPK.RESERVE key topk [width depth decay]
- Available in:
- Redis Open Source / Bloom 2.0.0
- Time complexity:
- O(1)
- ACL categories:
-
@topk,@write,@fast,
Initializes a Top-K sketch with specified parameters.
Parameters
- key: the name of the Top-k sketch.
- topk: the number of top (k) occurring items to keep.
Optional parameters
- width: Number of counters kept in each array. (Default 8)
- depth: Number of arrays. (Default 7)
- decay: The probability of reducing a counter in an occupied bucket (decay ^ bucket[i].counter). As the counter gets higher, the likelihood of a reduction is lower. (Default 0.9)
Example
redis> TOPK.RESERVE topk 50 2000 7 0.925
OK
Return information
One of the following:
- Simple string reply
OKif executed correctly. - Simple error reply in these cases: incorrect number of arguments, invalid decay value, or key already exists.