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NCACHE.STATS

Last updated 
NCACHE.STATS namespace
Group
Keyed caches
Complexity
O(1)
Arity
2 (exactly, counting the command name)
Flags
read-only, fast
Keys
first 1, last 1, step 1
HotKV Cloud
Performance and Scale
On-Premise
requires the negative-cache license feature

The negative cache holds negative results, such as “user not found” or “refused by moderation”, usually with a short TTL, so repeated lookups for the same missing or refused item do not reach your backend or model again. NCACHE.STATS reports counters for one namespace. For a namespace that does not exist, every counter is zero.

Return value

Section titled “Return value”

The reply is a flat array of alternating field names and values in both RESP2 and RESP3 (it is not sent as a RESP3 map). The fields, in order:

Field Type Meaning
entries Integer Entries currently stored.
hits Integer Lookups that found a live entry.
misses Integer Lookups that found nothing or an expired entry.
evictions Integer Entries removed to make room or because they expired.
memory_bytes Integer Approximate memory used by the entries.
usage_saved_requests Integer Hits on entries that carried usage options.
usage_saved_input_tokens Integer Input tokens those hits did not have to spend.
usage_saved_output_tokens Integer Output tokens those hits did not have to spend.
usage_saved_cache_read_tokens Integer Provider cache-read tokens saved.
usage_saved_cache_write_tokens Integer Provider cache-write tokens saved (5-minute and 1-hour combined).
usage_saved_cost_usd Bulk string Cost saved in US dollars with six decimals, for priced models only.

The usage_saved_* fields only grow for entries stored with the usage options of NCACHE.SET.

Errors:

  • ERR wrong number of arguments for 'ncache.stats' command if the argument count is wrong.
  • NOLICENSE negative-cache requires a HotKV license. Contact sales@hotkv.com if your license does not include the negative-cache feature.

Examples

Section titled “Examples”
127.0.0.1:6379> NCACHE.STATS lookups
 1) "entries"
 2) (integer) 2
 3) "hits"
 4) (integer) 5
 5) "misses"
 6) (integer) 1
 7) "evictions"
 8) (integer) 0
 9) "memory_bytes"
10) (integer) 190
11) "usage_saved_requests"
12) (integer) 0
13) "usage_saved_input_tokens"
14) (integer) 0
15) "usage_saved_output_tokens"
16) (integer) 0
17) "usage_saved_cache_read_tokens"
18) (integer) 0
19) "usage_saved_cache_write_tokens"
20) (integer) 0
21) "usage_saved_cost_usd"
22) "0.000000"

The memory figure depends on your data.

Compatibility

Section titled “Compatibility”

HotKV-only command. Redis and Valkey have no equivalent.

See also

Section titled “See also”

NCACHE.CREATE, NCACHE.SET, NCACHE.GET, NCACHE.DEL, NCACHE.FLUSH, NCACHE.DROP, NCACHE.LIST, AI features guide