Print number of keys in Redis

Question

Is there a way to print the number of keys in Redis   I am aware of   keys     But that seems slightly heavy weight  - Given that Redis is a key value store maybe this is the only way to do it  But I would still like to see something along the lines of   count keys

User · Answer

eval  local count   redis call  scan   0   match    key   key    count   10000  if count    0 then return  count 2  end   0  eval  local count   redis call  sscan    key key all   0   match         count   1000000  if count    0 then return  count 2  end   0

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DBSIZE returns the number of keys and it s easier to parse   Downside  if a key has expired it may still count   http   redis io commands dbsize

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For getting count total number of keys   use below command   127 0 0 1 6379 gt  DBSIZE

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After Redis 2 6  the result of INFO command are splitted by sections  In the  keyspace  section  there are  keys  and  expired keys  fields to tell how many keys are there

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Go to redis-cli and use below command info keyspace  It may help someone

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Since Redis 2 6  lua is supported  you can get number of wildcard keys like this  eval  return  redis call  keys    prefix-     0   see eval command

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dbsize   returns the total number of keys   You can quickly estimate the number of keys matching a given pattern by sampling keys at random  then checking what fraction of them matches the pattern   Example in python  counting all keys starting with prefix    import redis r   redis StrictRedis host    localhost   port 6379  iter 1000 print  Approximately   r dbsize     float sum  r randomkey   startswith  prefix    for i in xrange iter       iter   Even iter 100 gives a decent estimate in my case  yet is very fast  compared to keys prefix    An improvement is to sample 1000 keys on every request  but keep the total count  so that after two requests you ll divide by 2000  after three requests you ll divide by 3000  Thus  if your application is interested in the total number of matching keys fairly often  then every time it will get closer and closer to the true value

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WARNING  Do not run this on a production machine   On a Linux box    redis-cli KEYS       wc -l   Note  As mentioned in comments below  this is an O N  operation  so on a large DB with many keys you should not use this  For smaller deployments  it should be fine

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You can issue the INFO command  which returns information and statistics about the server  See here for an example output  As mentioned in the comments by mVChr  you can use info keyspace directly on the redis-cli  redis gt  INFO   Server redis version 6 0 6 redis git sha1 00000000 redis git dirty 0 redis build id b63575307aaffe0a redis mode standalone os Linux 5 4 0-1017-aws x86 64 arch bits 64 multiplexing api epoll atomicvar api atomic-builtin gcc version 9 3 0 process id 2854672 run id 90a5246f10e0aeb6b02cc2765b485d841ffc924e tcp port 6379 uptime in seconds 2593097 uptime in days 30 hz 10 configured hz 10 lru clock 4030200 executable  usr local bin redis-server

[redis] Print number of keys in Redis

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