From 13f73923356040439f55fb6009fdb1b8dcbaaefa Mon Sep 17 00:00:00 2001 From: Jan-Erik Rediger Date: Sun, 10 Nov 2013 21:28:48 +0100 Subject: [PATCH] new post: Redis FAQ or: what you learn when idling in #redis --- ...-or-what-you-learn-when-idling-in-redis.md | 53 +++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 _posts/2013-11-10-redis-faq-or-what-you-learn-when-idling-in-redis.md diff --git a/_posts/2013-11-10-redis-faq-or-what-you-learn-when-idling-in-redis.md b/_posts/2013-11-10-redis-faq-or-what-you-learn-when-idling-in-redis.md new file mode 100644 index 0000000..2605e6a --- /dev/null +++ b/_posts/2013-11-10-redis-faq-or-what-you-learn-when-idling-in-redis.md @@ -0,0 +1,53 @@ +--- +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/