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@martinesmann
martinesmann / 0README.md
Last active April 10, 2025 22:53
Couchbase N1QL Samples.

#Learn N1QL by sample

N1QL is the document query language used to query data in Couchbase Server (CB). N1QL will be an integrated part of CB 4, until then there is a preview version available.

##SQL for JSON Documents N1QL is the first language to combine the flexibility of JSON with power of SQL queries. With N1QL you can run SQL like queries against your CB data without the need to pre-build views. N1QL enables advanced ad-hoc document queries in a familiar query language.

##Learning

@qix
qix / Redis_in_Production_at_Smyte.md
Created October 7, 2016 16:56

Redis in Production at Smyte

To be clear we continue to run many Redis services in our production environment. It’s a great tool for prototyping and small workloads. For our use case however, we believe the cost and complexity of our setup justifies urgently finding alternate solutions.

  • Each of our Redis servers are clearly numbered with a current leader in one availability zone, and a follower in another zone.
  • The servers run ~16 different individual Redis processes. This helps us utilize CPUs (as Redis is single-threaded) but it also means we only need an extra 1/16th memory in order to safely perform a BGSAVE (due to copy-on-write), though in practice it’s closer to 1/8 because it’s not always evenly balanced.
  • Our leaders do not every run BGSAVE unless we’re bringing up a new slave which is carefully done manually. Since issues with the slave should not affect the leader and new slave connections might trigger an unsafe BGSAVE on the leader, slave Redis processes are set to not automatically rest