07:10:49 GMT <Sparrow_> hi, i want to know the memory taken by keys, i run "redis-cli --bigkeys", but it seems by default it selected only database 0. how do i run the same command for database 4?? please help...
07:11:59 GMT <Sparrow_> P.S. - i run this command on ubuntu 14.04
07:13:25 GMT <Sparrow_> no need to reply i got it
18:32:08 GMT <Aristona> Hey guys, what would be a low complexity approach for a private messaging system?
18:32:34 GMT <Aristona> I'm thinking about creating chat sessions, place them into a set like so: user:1:chats = [...]
18:33:02 GMT <Aristona> And each chat session contains a LIST of a small JSON entry. (sender, message, timestamp etc.)
18:33:24 GMT <Aristona> Is there a smarter way?
18:33:25 GMT <minus> sounds familiar; were you here before?
18:33:50 GMT <Aristona> I've been into this channel time to time, but never asked this question before
18:34:35 GMT <Aristona> Thinking about some tricky like relying on sorted sets and keeping the key as timestamp of message
18:35:25 GMT <minus> sounds sensible
18:38:04 GMT <Aristona> I'm also worrying about having to decode strings into JSON literals each time
18:38:18 GMT <Aristona> Cause, what I get from Redis is a string representation of a JSON object
18:38:45 GMT <Aristona> I guess I cannot place stuff like hashes inside sets, right?
18:38:54 GMT <Aristona> Like a JS array containing objects
18:40:07 GMT <Aristona> Actually, I can offload that task to my client I guess
18:40:23 GMT <Aristona> What about this issue, minus
18:40:51 GMT <Aristona> My chat contains a JSON string like so: { sender: 1, receiver: 5, message: "Hello", timestamp: 13123123213 }
18:41:33 GMT <Aristona> Then I have to replace sender: 1 with redis.hgetall(`user:${res.sender}:details`)
18:41:45 GMT <Aristona> so I can access his avatar, email and other information
18:41:47 GMT <minus> Aristona: you can't nest data types, no
18:42:16 GMT <Aristona> The complexity of it would be o(n) I guess, where n is the amount of unique users in a chat session
18:43:17 GMT <minus> maybe redis is the wrong thing to store users?
18:43:32 GMT <minus> then again you're just storing basic metadata
18:43:32 GMT <Aristona> I just store basic information such as email, avatar and other things
18:46:06 GMT <Aristona> If there are 10 users in a chat room, then I have to do 10 HGETALL commands to obtain each user's information. Can it be done in a smarter way?
18:47:29 GMT <minus> not really
18:47:45 GMT <minus> you could serialize and dump that info into a set per channel
18:48:03 GMT <minus> so it's just one SMEMBERS
18:49:20 GMT <Aristona> Uhm, how exactly can I do that?
18:49:32 GMT <Aristona> I don't think I can store HGETALL's response in a set
18:49:39 GMT <Aristona> Not sure if I understood you correctly
18:51:30 GMT <minus> you can if you serialize it to json
18:53:38 GMT <Aristona> And update that SET each time someone enters/leaves the chat session?
18:53:50 GMT <Aristona> It will act like a front cache if I understood correctly
18:55:40 GMT <minus> yeah
18:55:58 GMT <Aristona> okay, sounds logical
18:56:30 GMT <minus> i wouldn't do that from the beginning though, since it does come with some complexity
18:58:20 GMT <Aristona> Yeah :)