new post: Redis FAQ or: what you learn when idling in #redis

_posts/2013-11-10-redis-faq-or-what-you-learn-when-idling-in-redis.md

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+---
+layout: post
+title: "Redis FAQ or: what you learn when idling in #redis"
+date: 10.11.2013 21:10
+---
+
+Sometime ago I created the [redis-faq][], a small list of common or not so
+common questions coming up in the `#redis` channel on freenode.
+
+There's not much on it yet, but I would like to extend it whenever possible.
+If you have something you want to add just ping me on [twitter][] or on freenode (`badboy_`).
+
+For now these are the only things in there so far:
+
+### Q: X is weird in my instance. Can you help?
+
+Maybe. To better help please give the following info:
+
+* Output of `redis-cli INFO`
+* Output of `redis-cli CONFIG GET '*'`
+
+Don't spam the channel, upload it to [pastebin][], as a [gist][] or similar.
+
+### Q: I want to use [SELECT](http://redis.io/commands/select) to seperate my data. Is this a good idea?
+
+Antirez decided `select` was an anti-pattern a loooong time ago. He won't fully
+deprecate it, but it doesn't get support in new features such as cluster. (via
+[brycebaril][]).
+[Relevant mail][ml-select].
+
+Just use seperate instances or use namespacing (often used: `namespace:real-key-name`)
+
+### Q: I have some data and need to retrieve it by date. How to to that?
+
+[Sorted Sets](http://redis.io/commands#sorted_set) can be useful here.
+Store some value and use the timestamp as the score. Then use [ZRANGEBYSCORE](http://redis.io/commands/zrangebyscore) to get it back.
+
+### Q: I installed a new version, but `redis-cli info server` still shows the old one
+
+* Make sure the old instance is already stopped. `pidof redis-server` or `ps aux | grep [r]edis-server` should only list one PID.
+* Make sure you're starting redis from the right path (if installed manually it might be different than when installed from your package manager)
+* Make sure you're connecting to the right port. It is possible to run multiple instances on different ports (default port is 6379)
+
+### Q: I have a background in SQL. Now I'm looking into how I can use Redis. Anything I need to consider?
+
+If you're used to SQL, storing data in Redis is more like creating the indexes for your SQL schema (from: [brycebaril][])
+
+[redis-faq]: https://gist.github.com/badboy/5958039
+[twitter]: https://twitter.com/badboy_
+[brycebaril]: https://github.com/brycebaril
+[ml-select]: https://groups.google.com/forum/#!msg/redis-db/vS5wX8X4Cjg/8ounBXitG4sJ
+[pastebin]: http://pastebin.com/
+[gist]: https://gist.github.com/