Other Commands

Bitmap, HyperLogLog, Geospatial, and Transaction commands.

Bitmap

SETBIT visits:today 1001 1
GETBIT visits:today 1001
BITCOUNT visits:today
BITPOS visits:today 1
BITOP AND dst key1 key2
BITFIELD key GET u8 0
BITFIELD key INCRBY u8 0 10 OVERFLOW SAT

HyperLogLog

Approximate cardinality (~0.81% error, fixed 12KB per key):

PFADD unique:visitors "user:1" "user:2"
PFCOUNT unique:visitors
PFCOUNT day1 day2              # union estimate
PFMERGE total day1 day2

Geospatial

GEOADD locations 13.361389 38.115556 "Palermo"
GEOADD locations 15.087269 37.502669 "Catania"
 
GEODIST locations Palermo Catania km
GEOPOS  locations Palermo
GEOHASH locations Palermo
 
GEOSEARCH locations FROMLONLAT 15 37 BYRADIUS 200 km ASC WITHCOORD WITHDIST
GEOSEARCH locations FROMMEMBER Palermo BYRADIUS 300 km ASC COUNT 5
GEOSEARCHSTORE dst locations FROMLONLAT 15 37 BYRADIUS 200 km ASC

Transactions

MULTI
SET key1 "val1"
INCR counter
HSET user:1 name "rana"
EXEC
 
MULTI
SET key1 "val1"
DISCARD        # cancel

Optimistic locking:

WATCH balance
MULTI
DECRBY balance 100
EXEC           # returns nil if balance changed since WATCH
UNWATCH